Electoral systems in Idaho

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The term electoral system can refer to the method by which elections are conducted (e.g., whether officials are elected in single-winner versus multi-winner systems) or the method by which votes are tallied to determine the outcome of an election (e.g., plurality systems, majority systems, ranked-choice voting systems, etc.). In the United States, most federal and state-level officials are elected via plurality vote in single-winner contests, although some jurisdictions use other electoral systems.

HIGHLIGHTS

* The Idaho State Senate comprises 35 senators elected via plurality vote in single-winner contests. The Idaho House of Representatives comprises 70 representatives elected via plurality vote in multi-winner contests (each senatorial district elects two representatives).[1]

* Idaho's governor, lieutenant governor, secretary of state, state controller, state treasurer, attorney general, and superintendent of public instruction are elected via plurality vote in single-winner contests.

* United States Senators and United States Representatives are also elected via plurality vote in single-winner contests.

See the sections below for additional information on the following topics:

1. Background: This section defines and describes methods for conducting elections, including single-winner systems and multi-winner systems. This section also defines and describes various vote-tallying methods, including plurality voting, majority voting, ranked-choice voting, block voting, single voting, and cumulative voting.
2. Electoral systems used in Idaho: This section outlines the electoral systems used in federal elections (i.e., elections for president and United States senators and representatives) and state-level contests (i.e., elections for state legislators, governors, and other state executives).
3. State legislation and ballot measures: This section lists state legislation and state and local ballot measures relevant to electoral systems policy.

## Contents

* 1 Background
* 1.1 Methods for conducting elections
* 1.2 Methods for tallying votes to determine electoral outcomes
* 1.2.1 Single-winner system methods
* 1.2.2 Multi-winner system methods
* 2 Electoral systems used in Idaho
* 2.1 Federal elections
* 2.2 State-level elections
* 3 State legislation and ballot measures
* 3.1 Recent legislation related to electoral systems in Idaho
* 3.2 Electoral systems ballot measures
* 4 Explore election legislation with Ballotpedia
* 5 See also
* 6 External links
* 7 Footnotes

## Background[edit]

The term electoral system can refer to two distinct but related concepts: the method for conducting elections and the method for tallying votes to determine electoral outcomes.

### Methods for conducting elections[edit]

Generally speaking, elections can take one of two basic forms: single-winner or multi-winner. In a single-winner election, one candidate alone can be elected to the office in question. In a multi-winner election, by contrast, multiple candidates can be elected to the same office.[2][3]

A single-winner system is one in which one candidate is elected for an office. Elections for the presidency of the United States are single-winner contests because the United States Constitution provides for a single chief executive, and no more than one person can serve in that capacity at any given moment. Elections for the United States House of Representatives are also single-winner contests, as each district is permitted to elect a single representative.[2][3]

A multi-winner system is one in which multiple candidates are elected to an office. Elections for at-large city council seats are sometimes multi-winner contests. For example, there may be three at-large council seats up for election in a given year. In some of these elections, voters are asked to select up to three choices on their ballots. The top three vote-getters win election to the at-large seats. Some state legislative chambers in the United States use multi-member districts, which elect multiple members. Proportional representation systems are a specific class of multi-winner systems in which offices are allocated to candidates or political parties in proportion to their share of the total vote.[2][3][4]

### Methods for tallying votes to determine electoral outcomes[edit]

#### Single-winner system methods[edit]

Vote-tallying methods for single-winner election systems include, but are not limited to, the following:

1. Plurality voting system: In plurality systems, the candidate who wins the largest share of the vote wins the election. The candidate need not win an outright majority to be elected. These systems are sometimes referred to as first-past-the-post or winner-take-all.[2]
2. Majority voting system: In majority systems, a candidate must win at least 50 percent of the vote to win the election. If no candidate wins an outright majority, a runoff election is held between the top two vote-getters. For this reason, majority systems are sometimes referred to as two-round systems.[2]
3. Single-winner ranked-choice voting system/instant runoff voting: In an instant runoff voting system, voters rank candidates by preference on their ballots. If a candidate wins a majority of first-preference votes, they are the winner. If no candidate wins a majority of first-preference votes, the candidate with the fewest first-preference votes is eliminated. Votes cast for the eliminated candidate are transferred to second-preference choices (if a ballot lists only the eliminated candidate, the vote is considered exhausted and is removed from future tallies). A new tally is conducted to determine whether any remaining candidate has won a majority of the remaining votes. The process is repeated until a candidate wins an outright majority.[2][5]

#### Multi-winner system methods[edit]

Vote-tallying methods for multi-winner election systems include, but are not limited to, the following:

1. Block voting system: In a block voting system, a voter can select as many candidates as there are open seats. The candidates with the greatest number of votes are elected. If, for example, there are three at-large city council seats up for election and six candidates for those seats, the top three vote-getters would win election to those seats.[2][6]
2. Single transferable voting system: In a single transferable vote system, each voter ranks the candidates on the ballot. Before the election, a quota is calculated, representing the number of votes a candidate must receive to be elected. Once a candidate hits that quota, they are considered a winner. Any votes they receive over the quota amount are then transferred to a voter's second choice. If no candidate receives a quota, the candidate with the fewest votes is eliminated, and their votes are transferred to the voter's second-choice candidate. The process continues until all seats are filled.[7][8] The system is also called proportional ranked-choice voting.[9]
3. Single non-transferable voting system: In a single non-transferable vote system, each voter can select one candidate, regardless of the number of open seats. The candidates with the greatest number of votes are elected (for example, if there are three open seats, the three candidates with the greatest number of votes will win the election).[2][6]
4. Cumulative voting: In a cumulative voting system, each voter can cast a number of votes equal to the number of seats up for election. A voter can allocate all of these votes to a single candidate or distribute them among several candidates. If, for example, there are three city council seats up for election, a voter can cast all three of those votes for a single candidate or split them among the three candidates (e.g., casting two votes for one candidate and one for another, etc.). The candidates with the highest number of votes win.[10]

## Electoral systems used in Idaho[edit]

The states have the authority to determine which electoral systems they will use in contests for state-level offices. The systems used in contests for federal office must adhere to federal constitutional guidelines, as well as applicable state laws.

### Federal elections[edit]

United States Capitol.

Article II, Section 1, of the United States Constitution provides that the President of the United States is elected by the Electoral College via majority vote in a single-winner contest. Of the 50 states, all but two award all of their presidential electors to the presidential candidate who wins the popular vote in the state (Maine and Nebraska each award two of their electors to the candidate who wins a plurality of the statewide vote; the remaining electors are allocated to the winners of the plurality vote in the states' congressional districts).[11]

Article I, Section 4, of the United States Constitution grants the states the authority to determine the rules by which they elect their United States Senators and Representatives, unless the United States Congress acts to change those rules:[12]

“  | The Times, Places and Manner of holding Elections for Senators and Representatives, shall be prescribed in each State by the Legislature thereof; but the Congress may at any time by Law make or alter such Regulations, except as to the Places of chusing Senators.[13] | ”

|
|

—Article I, Section 4, of the United States Constitution

Article I and the Seventeenth Amendment of the United States Constitution establish that each state selects two United States Senators in staggered elections. In 1967, the United States Congress passed a law requiring that each state establish single-winner districts and exclusively elect their United States Representatives from those districts. Consequently, in every state, United States Senators and United States Representatives are elected in single-winner contests. A majority of states determine winners in these contests via plurality vote.

In Idaho, winners in congressional contests are determined via plurality vote.[14][15]

### State-level elections[edit]

All elective state executive officers (e.g., governors, secretaries of state, treasurers, etc.) in the United States are selected via single-winner contests. A total of 41 states conduct only single-winner contests for their state legislative elections. The 9 remaining states conduct multi-winner contests for some state legislative seats. Plurality counts are generally used to determine electoral outcomes, though some states and jurisdictions use other tabulation methods (for example, for some offices, Louisiana employs a majority voting/two-round system in which a runoff general election is held if no candidate for congressional or state-level office wins a majority of the vote in the first round of voting).[14]

The table below details the electoral systems used in Idaho for state legislative and state executive offices as of January 2026.

Electoral systems for state-level offices in IdahoOffice| Single-winner or multi-winner| Vote tabulation method

|
|

Idaho House of Representatives| Multi-winner[16]| Plurality[15]
Idaho State Senate| Single-winner[17]| Plurality[15]
Idaho Governor| Single-winner[18]| Plurality[15]
Idaho Lieutenant Governor| Single-winner[18]| Plurality[15]
Idaho Secretary of State| Single-winner[18]| Plurality[15]
Idaho Controller| Single-winner[18]| Plurality[15]
Idaho Treasurer| Single-winner[18]| Plurality[15]
Idaho Attorney General| Single-winner[18]| Plurality[15]
Idaho Superintendent of Public Instruction| Single-winner[18]| Plurality[15]

## State legislation and ballot measures[edit]

### Recent legislation related to electoral systems in Idaho[edit]

The table below lists bills related to electoral systems that have been introduced during (or carried over to) the current legislative session in Idaho. The following information is included for each bill:

* State
* Bill number
* Official bill name or caption
* Most recent action date
* Legislative status
* Sponsor party
* Topics dealt with by the bill

Bills are organized by most recent action. The table displays up to 100 results. To view more bills, use the arrows in the upper-right corner. Clicking on a bill will open its page on Ballotpedia's Election Administration Legislation Tracker, which includes bill details and a summary.

### Electoral systems ballot measures[edit]

See also: Elections and campaigns on the ballot and List of Idaho ballot measures

Ballotpedia has tracked no ballot measures relating to electoral systems in Idaho.

## Explore election legislation with Ballotpedia[edit]

* Try Ballotpedia's Election Administration Legislation Tracker

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## See also[edit]

Select a state on the map below to read more about electoral systems in that state.

Choose your state...AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWashington, D.C.West VirginiaWisconsinWyoming

http://ballotpedia.org/Electoral_systems_in_STATE

* Voting in Idaho
* Redistricting in Idaho
* Election dates

## External links[edit]

* FairVote, Electoral Systems
* ACE: The Electoral Knowledge Network, Electoral Systems
* The International Institute for Democracy and Electoral Assistance, Electoral System Design Database

## Footnotes[edit]

1. ↑ Idaho Legislature, "House," accessed July 21, 2017
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 FairVote, "Electoral Systems," accessed December 17, 2025
3. ↑ 3.0 3.1 3.2 Norris, Pippa. "Choosing Electoral Systems: Proportional, Majoritarian and Mixed Systems." International Political Science Review Vol. 18, No. 3, (1997): 297-312.
4. ↑ U.K. Parliament, "Proportional representation," accessed December 17, 2025
5. ↑ MIT Election Lab, "Instant Runoff Voting," accessed December 17, 2025
6. ↑ 6.0 6.1 The International Institute for Democracy and Electoral Assistance, "Electoral System Design Database, Glossary," accessed December 17, 2025
7. ↑ Electoral Reform Society, "Single Transferable Vote," accessed December 17, 2025
8. ↑ Institute of Mathematical Statistics, "Single Transferable Voting System," accessed December 17, 2025
9. ↑ FairVote, "Proportional Ranked Choice Voting Example," accessed December 17, 2025
10. ↑ ACLU of Missouri, "Cumulative Voting, Explained," accessed December 17, 2025
11. ↑ United States Constitution, "Article II, Section 1," accessed December 3, 2025
12. ↑ United States Constitution, "Article I, Section 4," accessed December 3, 2025
13. ↑ Note: This text is quoted verbatim from the original source. Any inconsistencies are attributable to the original source.
14. ↑ 14.0 14.1 FairVote, "Electoral Systems in the United States," accessed January 14, 2026 Cite error: Invalid `<ref>` tag; name "winnertakeall" defined multiple times with different content
15. ↑ 15.0 15.1 15.2 15.3 15.4 15.5 15.6 15.7 15.8 15.9 Idaho Statutes, "Title 34, Chapter 12, Section 34-1215," accessed January 14, 2026
16. ↑ Constitution of the State of Idaho, "Article III, Section 5," accessed January 14, 2026
17. ↑ Constitution of the State of Idaho, "Article III, Section 4," accessed January 14, 2026
18. ↑ 18.0 18.1 18.2 18.3 18.4 18.5 18.6 Constitution of the State of Idaho, "Article IV, Section 1," accessed January 14, 2026

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