Elections and Constituencies

Elections to the House of Commons are the democratic foundation of responsible government in the United Kingdom of America. The Commons supplies governments, grants money, and sustains or dismisses a ministry through confidence, and its 460 members are the most direct link between ordinary voters and federal power. Every member is returned at a single general election held across the whole realm, and the party or coalition that can command the resulting House forms the government.

The system is neither the pure first-past-the-post of older Westminster practice nor a national party-list scheme. It is a federal hybrid built around the polities of the union. 364 members sit for a single named constituency, and 96 are added, polity by polity, to bring each delegation closer to how its people actually voted. The design keeps the local member at the centre of the system while smoothing the sharpest distortions of a plurality count, and it does so without ever placing a member in the Commons who did not stand for a named place.

The system

A federal mixed-member design

The Commons is elected on a mixed-member system in which the proportional correction is applied within each polity separately rather than across the realm as a whole. Each polity is allotted a number of seats by population, subject to a floor; the greater part of those seats are single-member constituencies; and the balance is used to correct that polity’s delegation against that polity’s own vote.

The local vote

Each constituency returns one member by first-past-the-post: the candidate with the most votes wins, whether or not that is a majority. This is the historic American local method, and it is retained because voters value a single identifiable member for a single identifiable place. Constituencies are named for their place in the Westminster manner, so a voter is represented by the member for Boston Harbour or Springfield North rather than by a number.

Where a seat covers a city and the country around it, the settled naming convention places the city first and the region second, as in Albany and the Capital District or Bowling Green and the West. A seat takes a region’s name alone only where the region is the identity and no city dominates it, as with the Berkshires, the Pine Barrens or the Bush.

The top-up, without a party list

The top-up seats are filled by a best-loser rule rather than from a party list. When a polity’s constituency results are counted, any party that has won fewer seats than its share of the vote warrants is awarded top-up members, and those members are the party’s strongest near-miss candidates: the men and women who came closest to winning a constituency without quite doing so. There are no list appointees who never faced the voters in a seat of their own. Every member of the Commons, constituency member and top-up member alike, is a candidate who stood for a named place and either won it or came close.

How many seats are topped up

The proportion is fixed by statute. A polity’s top-up seats are one in five of its delegation, rounded to the nearest whole seat, with a minimum of one.

A polity of twenty-six seats therefore returns twenty-one constituency members and five top-up members; a polity of eight returns six and two; a polity of four returns three and one; and a polity at the floor of three returns two and one. The rule is arithmetically simple by design, because a formula that requires a calculation is a formula that invites an argument, and the boundary commissions have enough of those already.

Four departures from the rule exist and are set out below. They are the small-polity election, the commissions’ one-seat discretion, the Columbia District, and the Territory of Loreto.

One mark does everything

The ballot carries a single X. There is no separate party vote. The one mark elects the local winner and, at the same time, feeds the count that decides the best-loser top-ups. A voter who marks a candidate is also, in effect, marking that candidate’s party for the correction, which keeps the ballot simple and the result legible.

The floor, the threshold, and the franchise

Every polity is guaranteed a minimum of three seats, however small its population, so that even the least populous can run its own small correction and cannot be reduced to a single voice. There is no formal vote threshold; the top-up pools are small enough that very minor parties are excluded by arithmetic rather than by an explicit cut-off. The franchise is universal for adults aged eighteen and over, with automatic enrolment and voluntary voting, and turnout is generally high.

Terms

A Commons sits for a maximum of five years, though the Prime Minister may seek an earlier dissolution, and the whole House is elected at once. Constituencies never cross a polity line: the polity is the unit of the map, and each seat nests wholly within one.

A worked example

The mechanism is easier to see once than to describe twice. What follows is a simplified count in Missouri, which returns eight members: six constituency seats and two top-ups.

Suppose the polity-wide vote falls as follows: the Conservative and Crown Union 38 per cent, the Labour and Social Democratic Party 31 per cent, the Liberal Federal Democrats 15 per cent, Alliance 90 and Green Realm 8 per cent, the Left and Solidarity Bloc 5 per cent, and Alternative for the Realm 3 per cent.

The six constituencies are counted first. Labour takes St. Louis, Kansas City and St. Louis County; the Conservatives take the KC Suburbs, Springfield and the Ozarks, and Mid-Missouri and the Bootheel. Three seats each, and nothing at all for the other four parties, which between them polled just under a third of the votes cast.

The correction then asks what an eight-seat delegation proportional to that vote would look like. The answer is three Conservatives, three Labour, one Liberal Federal Democrat and one Green. The Conservatives and Labour already hold exactly their entitlement, so they receive nothing further. The two top-up seats therefore go to the Liberal Federal Democrats and the Greens.

They are not filled from a list. The Liberal Federal Democrat top-up member is that party’s strongest losing candidate anywhere in Missouri, who on these figures is its candidate in St. Louis County, beaten by some nine hundred votes. The Green top-up member is that party’s strongest loser, its candidate in Kansas City. Both stood in a named seat, both faced the voters there, and both can be asked at the next election what they did for the place they contested.

The result is a delegation of eight in which four parties are represented rather than two, arrived at without a single appointee.

The boundary commissions

Appointment and independence

Constituency boundaries are drawn by independent commissions, one for each polity, working to uniform federal rules. A commission is chaired by a judge of the polity’s superior court, who does not vote except to break a tie, and its members are appointed for fixed terms that deliberately straddle a general election so that no ministry appoints a whole commission. Members may not have held party office or sat in any legislature within the preceding ten years.

The commissions are the direct descendants of the machinery created by the Parliamentary Reform Act 1859, and their insulation from party control is the settlement that ended the rotten and pocket boroughs of the early realm.

The uniform rules

The rules require constituencies of roughly equal population within each polity, subject to a permitted variance, and require the commissions to have regard to county and municipal boundaries, to natural features, and to what the rules call the continuity of a community’s representation. That last consideration is why the realm’s constituency names change less often than its boundaries do: a commission that must move a line will usually keep the name.

The commissions redraw the map after each decennial census. They do not allocate the top-up seats, which follow from the statutory proportion and are not theirs to draw.

Challenges

A commission’s final recommendations may be challenged in the federal courts, and have been, though the grounds are narrow: a challenge must establish that the commission departed from the uniform rules, and not merely that a different map would have been better. The courts have set aside a commission’s work three times in the modern period, in each case for a failure of process rather than of judgement, and the standing observation of the realm’s election lawyers is that the commissions are challenged most often by the party that has just lost the polity and least often by anyone with a case.

History

Allocation by accretion

Before 1859 the Commons was allocated by accretion. Each polity acceding to the Union brought with it a number of members settled at the moment of its accession, by the instrument that admitted it, and that number was revised only when Parliament happened to revise it. Some polities had been reapportioned once since joining; several had never been reapportioned at all. The result was a chamber whose arithmetic recorded the realm of the 1780s and the 1820s, layered over one another, and corrected nowhere.

The Reform Act of 1859

The Parliamentary Reform Act 1859 redistributed the Commons on a population quota, extended the franchise, and created the boundary machinery that still operates. It is the origin of the modern constituency map and of the principle that a chamber which cannot correct its own composition will eventually be corrected by something worse.

The Act governs the constituency seats only. It knows nothing of top-ups, which did not then exist, and its quota and its commissioners have never had anything to do with them.

The mixed-member settlement

The top-up was added seventy years later, by the Representation Act 1929, and it was added because the first-past-the-post count had stopped producing defensible results.

The rise of a third national party through the 1910s and 1920s split the vote in a way the old count could not handle. Three general elections in that decade returned Commons majorities to parties that had polled well under half the votes cast, and in one of them the second party by votes finished third by seats. The argument for correction was made most forcefully by the party that suffered worst from the distortion and was conceded, eventually, by the party that had benefited, on the reasoning that a system which could reverse a result once would reverse it against them in time.

What the realm would not accept was a party list. The objection was cultural rather than technical and it was overwhelming: a legislator who owed a seat to a party office rather than to an electorate was held to be no legislator at all. The best-loser rule was the compromise that made the correction acceptable, and the per-polity pool was the compromise that made it federal. Both survive unchanged.

Apportionment

Seats are shared among the polities by population, subject to the floor of three. The giants hold large delegations, but the floor lifts the many small polities and flattens the curve, so the House is top-heavy without being dominated by a handful of members. The apportionment is revised after each census.

The tables below give every polity’s seats, its named constituencies, and its top-up members. An asterisk marks a polity that departs from the one-in-five proportion, for the reasons given under Departures from the rule.

The Northeast (84)

The Mid-Atlantic and the capital (12)

The South (150)

The Great Lakes and the Midwest (82)

The Plains (16)

The Mountain West (42)

The Pacific (74)

The realm’s totals are 460 seats: 364 constituencies and 96 top-up members.

Departures from the rule

The small-polity election

A polity at the floor of three may resolve to name all three of its seats and forgo the correction entirely. The provision exists because the floor was designed to guarantee a small polity a voice, and a polity may reasonably conclude that three members who each answer to a named place is a louder voice than two members and a corrective.

Three polities have made that election. Rhode Island made it first and has never revisited it, on the argument that a polity of its compactness can be wholly covered by three real seats and has no district that a top-up member could usefully represent. West Virginia made it because of the coalfields: the Commonwealth’s southern counties are unlike its northern panhandle in almost every respect, and its politics have long held that each of its three regions must have a member of its own who can be held to account for it. Alaska made it because of distance, the Kingdom taking the view that Anchorage, the Interior and the Bush are three worlds and that a member for none of them in particular would serve none of them at all.

The election is reversible by resolution of the polity’s legislature and none of the three has reversed it.

Commission discretion

The uniform rules permit a commission to draw one constituency more or one fewer than the proportion strictly gives, where the geography of the polity makes the exact figure produce an indefensible seat. Three commissions presently exercise it. The discretion is deliberately small, has never been used to alter a polity’s total seats, and moves only the line between constituency and top-up members within a delegation that is fixed by population either way.

The Columbia District

The Columbia District, the federal capital, elects a single member, a deliberate exception that holds the seat of power below the floor so that the capital cannot loom over the legislature that sits within it. The mechanics follow from that: a district that is not a polity has no pool to be corrected inside, so its single seat is a constituency seat with no top-up attached.

The Territory of Loreto

The Territory of Loreto, the Baja peninsula acquired in 2027, returns five interim territorial members, sitting for Tijuana North, Tijuana South, Mexicali, Ensenada and the Pacific Coast, and La Paz and the Cape. The number was fixed at the full population quota on the transferred Mexican census figures and weighted, as the peninsula’s population is, heavily to the north.

The five are constituency seats with no correction attached, because the Territory is not a polity and has no delegation to correct, and they are not counted against the canonical 460 pending the settlement of Loreto’s permanent status. Loretanos have observed that this makes them the only members of the Commons whose seats are provisional, and that nobody has told them what the provision is waiting for.

Polities that return nobody

Semi-sovereign Indigenous nations send no members of their own to the federal Commons; their people vote within the seats of the enclosing polity, and their distinct representation is a matter for that polity’s own institutions rather than for reserved federal seats. The Navajo Republic is accordingly represented through the March of Arizona. The Free City of Philipsburg has traded parliamentary representation for enhanced autonomy and holds no seats at all.

The constituencies

The named single-member constituencies of the realm are listed below, polity by polity.

The Northeast

New York (26 seats). Manhattan South, Manhattan North, Brooklyn West, Central Brooklyn, South Brooklyn, Queens North, Queens South, Queens East, Bronx South, Bronx North, Staten Island, Nassau, Suffolk, Westchester, the Lower Hudson, Albany and the Capital District, Syracuse, Rochester, Buffalo, the Southern Tier, and the North Country. Five top-up members.

Pennsylvania (17 seats). Philadelphia Central, Philadelphia North, Philadelphia West, Philadelphia South, the Main Line, Bucks, Delaware County, Pittsburgh City, the Monongahela Valley, the Lehigh Valley, Harrisburg and the Susquehanna, Scranton and the Anthracite, Central Pennsylvania, and Erie and the Northwest. Three top-up members.

New Jersey (12 seats). Newark, Jersey City and the Hudson Waterfront, Essex and the Oranges, Bergen, the Raritan Valley, Trenton and the Delaware, Toms River and the Northern Shore, Atlantic City and the South Shore, Camden and the Southwest, and the Pine Barrens. Two top-up members.

Massachusetts Bay (9 seats). Boston Harbour, Boston Back Bay, Cambridge, the North Shore, the South Shore, Worcester, and Springfield and the Connecticut Valley. Two top-up members.

Connecticut (5 seats). Hartford, New Haven, Bridgeport and the Gold Coast, and the Connecticut Valley. One top-up member.

Plymouth (3 seats). Plymouth and New Bedford, and Cape Cod and the Islands. One top-up member.

Rhode Island (3 seats). Providence, Blackstone-Bay, and Newport-South County. No top-up member; the polity names all its seats.

New Hampshire (3 seats). Manchester and the Merrimack, and the North Country. One top-up member.

Vermont (3 seats). Burlington and the Champlain Valley, and Rutland and the South. One top-up member.

Maine (3 seats). Portland and the South Coast, and Bangor and the North Woods. One top-up member.

The Mid-Atlantic and the capital

Maryland (8 seats). Baltimore City, Anne Arundel and Annapolis, Montgomery, Prince George’s, the Eastern Shore, and Western Maryland. Two top-up members.

Lower Counties on the Delaware (3 seats). Wilmington, and Dover and the Lower Counties. One top-up member.

Columbia District (1 seats). New Westminster. No top-up member; the polity names all its seats.

The South

Virginia (11 seats). Richmond Central, Richmond and Henrico, Norfolk and Hampton Roads, Virginia Beach, Arlington and Northern Virginia, the Shenandoah, the Piedmont, Tidewater, and Southwest Virginia. Two top-up members.

North Carolina (14 seats). Charlotte Central, Charlotte and Mecklenburg, Raleigh, Durham and the Research Triangle, Greensboro and the Triad, Fayetteville, the Coastal Plain, the Outer Banks, Asheville and the Mountains, Wilmington and the Cape Fear, and the Sandhills. Three top-up members.

South Carolina (7 seats). Charles Town and the Lowcountry, Columbia, Greenville and the Upstate, Spartanburg, the Pee Dee, and the Grand Strand. One top-up member.

Georgia (14 seats). Atlanta Central, Atlanta North, the Atlanta Suburbs, Savannah and the Coast, Augusta, Columbus, Macon and the Heartland, Athens, the Golden Isles, North Georgia, and Southwest Georgia. Three top-up members.

Tennessee (9 seats). Nashville, Memphis, Knoxville, Chattanooga, the Tri-Cities, Middle Tennessee, and West Tennessee. Two top-up members.

Kentucky (6 seats). Louisville, Lexington and the Bluegrass, Northern Kentucky, Eastern Kentucky, and Bowling Green and the West. One top-up member.

West Virginia (3 seats). Charleston and the Kanawha, the Northern Panhandle, and the Southern Coalfields. No top-up member; the polity names all its seats.

Texas (37 seats). Houston Central, Houston North, Houston West, Houston East, Houston Southwest, the Woodlands, Fort Bend, Galveston Bay, Dallas Central, Dallas North, Dallas East, Fort Worth, Arlington and the Mid-Cities, Plano and Collin, Denton, Irving, San Antonio Central, San Antonio North, San Antonio West, San Antonio South, Austin Central, Austin North, Austin and the Hill Country, the Rio Grande Valley, Laredo and the Border, Corpus Christi and the Coastal Bend, East Texas, the Panhandle, and the Permian Basin. Eight top-up members.

Florida (28 seats). Miami Central, Miami Beach, Miami West, Hialeah, Fort Lauderdale, the Palm Beaches, the Everglades, Tampa, St. Petersburg, Clearwater, the Suncoast, Orlando Central, Orlando East, the Space Coast, Lakeland and the Ridge, Jacksonville, the First Coast, Tallahassee and the Panhandle, Fort Myers and the Gulf, Naples, the Treasure Coast, and Gainesville and the North Central. Six top-up members.

Louisiane (6 seats). La Nouvelle-Orléans Centre, La Nouvelle-Orléans Est, Bâton-Rouge, l’Acadiane, and la Louisiane du Nord. One top-up member.

Alabama (7 seats). Birmingham, Montgomery, Mobile and the Gulf, Huntsville and the Tennessee Valley, the Black Belt, and Tuscaloosa. One top-up member.

Mississippi (4 seats). Jackson, the Gulf Coast, and the Delta. One top-up member.

Arkansas (4 seats). Little Rock, the Ozarks and the North-West, and the Delta. One top-up member.

The Great Lakes and the Midwest

Illinois (17 seats). Chicago Loop, Chicago North Lakefront, Chicago Northwest, Chicago West, Chicago South, Chicago Southwest, the North Shore, the Cook Suburbs, DuPage, the Fox Valley, Rockford, Peoria, Springfield and Central Illinois, and Little Egypt. Three top-up members.

Ohio (15 seats). Cleveland Central, Cleveland East, Columbus Central, Columbus North, Columbus and the Franklin Suburbs, Cincinnati, the Cincinnati Suburbs, Akron, Dayton, Youngstown and the Mahoning Valley, Canton, and Appalachian Ohio. Three top-up members.

Michigan (13 seats). Detroit Central, Detroit East, Toledo and the Strip, Macomb, Oakland, Grand Rapids, Ann Arbor, Lansing, Flint and the Thumb, and Traverse City and the Straits. Three top-up members.

Indiana (9 seats). Indianapolis Central, Indianapolis Suburbs, Fort Wayne, Gary and the Calumet, Evansville, South Bend, and Bloomington and the South. Two top-up members.

Wisconsin (8 seats). Milwaukee, the Milwaukee Suburbs, Madison, Green Bay and the Fox Valley, Eau Claire and the West, and the Northwoods and the Upper Peninsula. Two top-up members.

Minnesota (8 seats). Minneapolis, Saint Paul, the Twin Cities Suburbs, Duluth and the Iron Range, Rochester and the South, and the Prairie. Two top-up members.

Missouri (8 seats). St. Louis, St. Louis County, Kansas City, the KC Suburbs, Springfield and the Ozarks, and Mid-Missouri and the Bootheel. Two top-up members.

Iowa (4 seats). Des Moines, the Quad Cities, and Sioux City and the West. One top-up member.

The Plains

Oklahoma-Sequoyah (5 seats). Oklahoma City, Tulsa, the Nations, and the Panhandle and the West. One top-up member.

Kansas (4 seats). Wichita, Johnson County and the Kaw, and the High Plains. One top-up member.

The Dakotas (4 seats). The Red River Valley, Sioux Falls, and Bismarck and the Missouri. One top-up member.

Nebraska (3 seats). Omaha, and Lincoln and the Plains. One top-up member.

The Mountain West

The March of Arizona (20 seats). Phoenix Central and North, Phoenix East and Tempe, Mesa and the Southeast Valley, Glendale and the West Valley, Tucson, Flagstaff and the High Country, Yuma and the Southwest, Las Vegas, the Las Vegas Suburbs, the Imperial Valley, El Paso, Durango and the San Juans, St. George and the Plateau, Albuquerque, Santa Fe and the North, Las Cruces and the South, and the Navajo Country and the Four Corners. Three top-up members. Phoenix East and Tempe is held by the Speaker of the House of Commons, Mark Kelly, and is not contested by the parties while he occupies the chair.

Colorado (7 seats). Denver, Aurora and the Suburbs, Colorado Springs, Boulder and the Front Range, and the Western Slope. Two top-up members.

Deseret (3 seats). Salt Lake City, and Provo and the Wasatch Front. One top-up member.

Nevada (3 seats). Reno and the North, and Carson City and the West. One top-up member.

Idaho (3 seats). Boise and the Treasure Valley, and Coeur d’Alene and the North. One top-up member.

Montana (3 seats). Billings and the East, and Missoula and the West. One top-up member.

Wyoming (3 seats). Cheyenne and the South, and the Wind River. One top-up member.

The Pacific

California (52 seats). Los Angeles Downtown, Los Angeles East, Hollywood, the Westside, the South Bay, Los Angeles Harbour, Long Beach, San Fernando West, San Fernando East, Pasadena and the San Gabriel Valley, Compton and the Gateway, South Los Angeles, the Antelope Valley, Anaheim, Santa Ana, the Orange Coast, North Orange, Riverside, San Bernardino, the High Desert, the Coachella Valley, San Diego Central, San Diego North, San Diego East, Chula Vista and the South Bay, the North County Coast, San Francisco, Oakland, the East Bay, San Jose Central, San Jose East, Silicon Valley, the North Bay, Contra Costa, Sacramento, the Sacramento Suburbs, Fresno, Bakersfield and Kern, Stockton and the San Joaquin, the North Coast, the Central Coast, and Modesto and the Central Valley. Ten top-up members.

Cascadia (16 seats). Seattle Central, Seattle North, the Eastside, Tacoma, Everett and the North Sound, Spokane, the Tri-Cities, Olympia and the South Sound, Portland Central, Portland East, Portland West, the Willamette Valley, and Bend and Eastern Oregon. Three top-up members.

Alaska (3 seats). Anchorage, the Interior, and the Bush. No top-up member; the polity names all its seats.

Hawaiʻi (3 seats). Honolulu, and the Neighbour Islands. One top-up member.

The parties and the count

Six parties contest federal elections, and the system does not treat them alike.

The best-loser rule rewards a party whose vote is spread, because a party that finishes a close second in six seats has six candidates available for a top-up, while a party that wins three seats narrowly and polls nothing elsewhere has none. This works to the advantage of the Liberal Federal Democrats, whose vote is the most geographically dispersed of the six and whom the no-threshold top-up converts into seats more efficiently than a concentrated vote of the same size, and against parties whose strength is regional.

The per-polity pool penalises small parties in small polities. In a delegation of three there is one top-up seat, and a party needs something close to a quarter of that polity’s vote to claim it. A party polling six per cent uniformly across the realm would take top-up seats in the large polities and nothing whatever in the twenty-odd polities at or near the floor. The correction is therefore real in New York and California and largely theoretical in Wyoming.

The result is a Commons that is proportional enough to deny any party a majority on a minority vote, and local enough that a party cannot build a delegation out of national averages. A six-party Commons under a mixed-member system ought to produce coalitions constantly. It does not, and the reasons for that are argued over in the realm’s political literature without being settled.

By-elections and vacancies

A vacancy in a constituency seat is filled by a by-election in that constituency, on the same franchise and by the same count.

A vacancy in a top-up seat cannot be, because there is no constituency to poll. The seat is filled instead by the next-eligible candidate of the same party from the same polity at the last general election: the runner-up to the runner-up, so to speak, taken from the list of near-misses the original count produced. If that party has no remaining candidate from that polity, the seat stays vacant until the next general election.

The arrangement is defended on the ground that the top-up seat belongs to the party’s share of the polity’s vote rather than to any particular place, and criticised on the ground that a member may thereby enter the Commons years after the election that produced the figures, without anyone having voted in the interval. Both propositions are true. Vacancies in top-up seats are uncommon and the question is raised sharply each time one occurs.

Criticism and reform

The system is defended more warmly than it is admired, and the criticisms of it are long-standing and largely unanswered.

The correction is uneven. A voter in California is inside a fifty-two-seat pool with ten corrective seats and a voter in Vermont is inside a pool of three with one, so the same vote for the same party is worth materially more in one polity than another. Defenders answer that this is federalism operating as designed and not a defect; critics answer that federalism is a reason to weight polities differently, not to weight citizens differently.

The best-loser rule rewards the wrong thing. A candidate can be returned to the Commons for having lost well, and a party can be advantaged by fielding respectable losers everywhere rather than by winning anywhere. The realm’s answer has always been that the alternative is a list, and that the realm will not have a list.

Three polities correct nothing at all, having taken the small-polity election, and a fourth is exempt by design. Something over one in twelve of the realm’s polities therefore returns a delegation with no proportional element in it whatever.

The reform proposals in circulation are three, and none has come close to enactment. A national correction would make the Commons proportional across the realm and is rejected as unfederal by everyone who would have to vote for it. A larger top-up share, of one seat in four or one in three, would make the correction bite in small polities and is resisted by constituency members, who are the people who would have to vote for it. And a regional correction, pooling the small polities of a region so that they correct together, is the proposal with the most academic support and the least political traction, since it would require constituencies or corrections to cross polity lines and the realm has never permitted either.

Chronology

Trivia

See also

• Parliament of the United Kingdom of America: the Crown-in-Parliament legislature the Commons sits within
• Parliamentary Reform Act 1859: the statute from which the population quota and the boundary commissions descend
• Prime Minister of the United Kingdom of America: the head of government, sustained by the confidence of the elected Commons
• Polities and the Federation: the constituent units among which the seats are shared
• Territory of Loreto: whose interim members sit outside the canonical 460
• Institutions and Government

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Institutions · Parliament · House of Commons · Elections · Constituencies · Franchise · Responsible Government · Federal Government