From 1993 to 2023,Montana was represented in theUnited States House of Representatives by one at-largecongressional district, among the 435 in theUnited States Congress. The district was the most populous U.S. congressional district at the time, with just over 1 million constituents,^[1] and thesecond-largest by land area, afterAlaska's at-large congressional district.

The district was last represented byRepublicanMatt Rosendale. It had previously been represented by RepublicanGreg Gianforte, who did not seek re-election in2020. Instead, he opted to run forGovernor of Montana.

Starting in the2022 midterm elections, per the2020 United States census, Montana regained the congressional seat that it lost after the 1990 census. Thus, the current at-large statewide district was dissolved, and the new districts were the1st district in the west and the2nd district in the east,^[2] restoring a configuration that had existed from 1919 to 1993. Rosendale sought re-election in the 2nd district and was elected.

PresidentGeorge W. Bush won Montana in the2004 presidential election with 59.1% of the vote, beatingJohn Kerry by 20 percentage points, which indicates that the district leansRepublican. However, four years laterJohn McCain won the state by only 2.5% overBarack Obama, and there is a significantDemocratic presence in the state: as of 2025 2U.S. Senate seat is held by two Republicans , which suggested at the time that the district could be competitive in future elections. In 2016,Donald Trump won by over 20%, whileRyan Zinke won Montana's single congressional seat by over 16%. Incumbent Democratic GovernorSteve Bullock, however, was also reelected by 4%. The seat was left vacant when Zinke was appointedSecretary of the Interior. In aspecial election held on May 25, 2017, RepublicanGreg Gianforte won with a margin of 6% and would be reelected by a margin of 5% in 2018.^{[3][further explanation needed]}

From statehood in 1889, until the creation of geographic districts in 1919, Montana was represented in theUnited States House of Representatives by members electedat-large, that is, requiring voting by all the state population. From 1913 to 1919, there weretwo seats, still electedat-large; the top two finishers were awarded the seats. After that time, two representatives were elected from two geographic districts of roughly equal population, from the east and the west of the state.

In thereapportionment following the1990 census, Montana lost one of its two seats. Its remaining member was again elected at-large.

Years	Cong ress		Seat A				Seat B
			Member	Party	Electoral history		Member	Party	Electoral history
March 4, 1889 – November 8, 1889	51st		Seat created upon statehood				A second seat was added in 1913.
November 8, 1889 – March 3, 1891			Thomas H. Carter (Helena)	Republican	Elected in 1889. Lost re-election.
March 4, 1891 – March 3, 1893	52nd		William W. Dixon (Butte)	Democratic	Elected in 1890. Lost re-election.
March 4, 1893 – March 3, 1897	53rd 54th 55th		Charles S. Hartman (Bozeman)	Republican	Elected in 1892. Re-elected in 1894. Re-elected in 1896. Retired.
March 4, 1897 – March 3, 1899				Silver Republican
March 4, 1899 – March 3, 1901	56th		Albert J. Campbell (Butte)	Democratic	Elected in 1898. Retired.
March 4, 1901 – March 3, 1903	57th		Caldwell Edwards (Bozeman)	Populist	Elected in 1900. Retired.
March 4, 1903 – March 3, 1907	58th 59th		Joseph M. Dixon (Missoula)	Republican	Elected in 1902. Re-elected in 1904. Retired torun for U.S. senator.
March 4, 1907 – March 3, 1913	60th 61st 62nd		Charles N. Pray (Fort Benton)	Republican	Elected in 1906. Re-elected in 1908. Re-elected in 1910. Lost re-election.
March 4, 1913 – March 3, 1917	63rd 64th		John M. Evans (Missoula)	Democratic	Elected in 1912. Re-elected in 1914. Re-elected in 1916. Redistricted to the1st district.		Tom Stout (Lewistown)	Democratic	Elected in 1912. Re-elected in 1914. Retired.
March 4, 1917 – March 3, 1919	65th						Jeannette Rankin[4](Missoula)	Republican	Elected in 1916. Redistricted to the1st district and retired torun for U.S. senator.

The two at-large seats were moved to district representation in 1919, and remained until 1993, when Montana lost a seat due toredistricting from the1990 U.S. census, re-establishing the single seat at-large district.

Member	Party	Years	Cong ress	Electoral history
District re-established January 3, 1993
Pat Williams (Helena)	Democratic	January 3, 1993 – January 3, 1997	103rd 104th	Redistricted from the1st district andre-elected in 1992. Re-elected in 1994. Retired.
Rick Hill (Helena)	Republican	January 3, 1997 – January 3, 2001	105th 106th	Elected in 1996. Re-elected in 1998. Retired.
Denny Rehberg (Billings)	Republican	January 3, 2001 – January 3, 2013	107th 108th 109th 110th 111th 112th	Elected in 2000. Re-elected in 2002. Re-elected in 2004. Re-elected in 2006. Re-elected in 2008. Re-elected in 2010. Retired torun for U.S. senator.
Steve Daines (Bozeman)	Republican	January 3, 2013 – January 3, 2015	113th	Elected in 2012. Retired torun for the U.S. senator.
Ryan Zinke (Whitefish)	Republican	January 3, 2015 – March 1, 2017	114th 115th	Elected in 2014. Re-elected in 2016. Resigned to becomeU.S. Secretary of the Interior.
Vacant		March 1, 2017 – June 21, 2017	115th
Greg Gianforte (Bozeman)	Republican	June 21, 2017 – January 3, 2021	115th 116th	Elected to finish Zinke's term. Re-elected in 2018. Retired torun for Governor of Montana.
Matt Rosendale (Glendive)	Republican	January 3, 2021 – January 3, 2023	117th	Elected in 2020. Redistricted to the2nd district.
District eliminated January 3, 2023

The following are official results from the general elections.^[5]

• 2004 Election results for Montana At Large Congressional district
• Martis, Kenneth C. (1989).The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
• Martis, Kenneth C. (1982).The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.
• Congressional Biographical Directory of the United States 1774–present

• Congressional districts of Montana
• At-large United States congressional districts
• Constituencies disestablished in 2023
• 2023 disestablishments in Montana
• Former congressional districts of the United States

• Articles with short description
• Short description is different from Wikidata
• Use mdy dates from October 2017
• Wikipedia articles needing clarification from September 2020