Political party loyalty of United States counties

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In the United States, a small number of counties have unusual voting histories, and the overall pattern is that many counties now vote consistently for one party.

- 15 counties have never voted for the Democratic presidential nominee.
- 5 counties have never voted for the Republican presidential nominee.

Counties with an uninterrupted Republican voting record since they were created:
- Doniphan County, Kansas (since 1864)
- Leslie County, Kentucky (since 1880)
- Colonial Heights, Virginia (since 1952)
- Poquoson, Virginia (since 1976)
- Chugach Census Area, Alaska (since 2020)
- Copper River Census Area, Alaska (since 2020)

Nine counties have never voted Democratic but did vote for Theodore Roosevelt in 1912 (a third-party run).

Twenty-five counties have voted Republican in every election since the Civil War ended, but they voted Democratic at least once before 1864; most also supported Roosevelt in 1912.

Five counties have always voted Democratic:
- Brooks County, Texas (since 1912)
- Jim Hogg County, Texas (since 1916)
- Menominee County, Wisconsin (since 1964)
- District of Columbia (since 1964)
- Kalawao County, Hawaii

Other notable streaks:
- Gasconade County, Missouri has the longest Republican streak, voting Republican in every presidential election since 1860.
- Elliott County, Kentucky has the longest Democratic streak (1872–2012), though it voted Republican in 2016.
- Northampton County, North Carolina has the longest ongoing Democratic streak (since 1900).
- Starr County, Texas voted Democratic from 1896 to 2020, then switched to Republican in 2024.

There are also notes about how the data are listed:
- The last time each county voted for the Democratic and Republican nominees is shown as of the 2024 election.
- Connecticut’s historic counties were replaced in 2022 by planning regions.
- Alaska’s results are not reported by boroughs or standard census areas in the same way, so estimates are shown based on current boundaries.