The 257 members of the Chamber of Deputies are elected by proportional representation in 24 multi-member constituencies based on the provinces (plus the Autonomous city of Buenos Aires).

The other half are chosen from 13 electoral districts allowing open list voter choice.

In Australia, federal constituencies are officially termed divisions, and their state counterparts electoral districts.

According to the constitution, the 50 seats reserved for women are allocated to the political parties according to their proportional representation.

In Brazil, seats in the lower chamber of the National Congress (Câmara dos Deputados) are split throughout the 26 States and the Federal District in a roughly proportional manner; however, a guaranteed minimum of 8 seats and maximum of 70 per federal entity means voters in Roraima have more than 8 times the representation as voters in São Paulo.

The country is divided into 28 electoral districts for the lower house and 15 senatorial constituencies for the Senate.

The Falkland Islands are divided into two constituencies, the Camp and Stanley which return three and five members respectively to the Legislative Assembly.

A referendum had been held in 2001 in which both Camp and Stanley voters rejected a change to a single constituency.

(Mercopress report on the 2011 referendum result) The Finnish Eduskunta, or Parliament, is made up of 200 members, elected from 15 separate geographic areas, or electoral districts.

The constituencies for the rest of the seats are the federal states, representatives being drawn from the top of their respective electoral lists.

German electoral law dictates that the deviation from average of all constituencies shall not exceed a certain figure.

Similar provisions apply for many of the federal state parliaments, though constituencies are generally smaller and boundaries change more frequently.

Members of the European Parliament are elected by party list proportional representation at the national level.

The Greek Parliament (Voulí ton Ellínon) has 300 members, elected for a four-year term by a system of 'reinforced' proportional representation in 56 constituencies, 48 of which are multi-seat and 8 single-seat.

The unicameral Legislative Council has 70 members, 35 returned from five geographical constituencies based on the Hare quota and largest remainder method, and the remaining 35 returned through 28 functional constituencies accounting for 30 seats and 1 district council representatives voted on by all registered voters that are not affiliated with any functional constituency, thus ensuring each voter has the same number of votes (2) - although the uneven electoral base remains controversial.

For People's Representative Council (DPR), there are 80 multi-member electoral districts called daerah pemilihan.

Regional Representative Council (DPD) elects 4 members per province, regardless of size and population.

Dáil constituencies in Ireland elect between three and five Teachtaí Dála (TDs) using the Single transferable vote method.

For the election of the Italian Chamber of Deputies, since 1993 Italy is divided in 27 districts called circoscrizioni.

However, the distribution of seats is calculated at national level, and the districts serve only to choose the single candidates inside the party lists.

For the Provincial elections, a special system is used, based on localized lists: even if the competition is disputed[clarification needed] on provincial level, candidates are presented in single-member districts, and their final position inside each party list depends by the percentage of votes they received in their own districts.

Apart from the elected constituencies, there's additional appointed seats in the state legislative assemblies of Sabah and Terengganu.

Each of these districts elects 5 members to parliament, using the single transferable vote (STV) method.

Norway is divided into 19 constituencies for parliamentary elections that correspond to traditional areas and counties.

They are used for the election of the deputies of the Portuguese unicameral national parliament, the Assembleia da República (Assembly of the Republic).

[12] The electoral system used is closed list proportional representation with seats allocated using the D'Hondt method.

The sole exception was the 1993 election in Madrid where a minor party list lost a seat.

In the United States, electoral districts for the federal House of Representatives are known as congressional districts (of which there are presently 435; the number can be changed but has remained at 435 since 1912, except for a brief period from 1959 to 1962 when two seats were temporarily added for the then-new States of Alaska and Hawaii), while the electoral districts for the variously named state legislatures go by a variety of names (and have differing numbers).

Long standing practice, reinforced and modified by several U.S. Supreme Court decisions, require the equalization of populations of electoral districts after each decennial census, a process known as redistricting.

As the National Assembly of Vietnam is unicameral, the delegates are elected based on the population of that area.