Petroleum County, Montana
AkashicPetroleum County, MTTrumpR+76.2
2024 precinct map of Petroleum CountyPrecinct-level 2024 presidential results for Petroleum County, with each precinct boundary colored by Democratic-vs-Republican margin, and gold where an independent or third-party candidate carried the precinct.
How it voted
Share of the 2024 vote
| Donald Trump ✓Republican | 87.7% | 284 |
|---|---|---|
| Kamala HarrisDemocratic | 11.4% | 37 |
| Robert F Kennedy Jr.We The People | 0.6% | 2 |
Harris +50Trump +50
1 precincts · 324 votes. Hover any precinct for its result.
The precinct map shows the 2024 presidential vote; the timeline scrubs the county’s overall result across 1928–2024.
38 presidential elections
| Year | Won | Democratic | Republican | Other | Margin | Total |
|---|---|---|---|---|---|---|
| R | 11.4%Harris37 | 87.7%Trump284 | 0.6%Kennedy2 | 324 | ||
| R | 11.2%Biden39 | 85.6%Trump298 | 3.2%Jorgensen11 | 348 | ||
| R | 9.3%Clinton30 | 86.3%Trump278 | 3.7%Johnson12 | 322 | ||
| R | 16.4%Obama49 | 80.5%Romney240 | 3.0%GRAY9 | 298 | ||
| R | 22.7%Obama68 | 75.7%McCain227 | 1.7%Paul5 | 300 | ||
| R | 18.8%Kerry55 | 78.1%Bush228 | 3.1%Nader9 | 292 | ||
| R | 11.8%Gore36 | 83.0%Bush254 | 2.0%Nader6 | 306 | ||
| R | 21.4%Clinton62 | 64.1%Dole186 | 12.4%Perot36 | 290 | ||
| R | 20.6%Clinton61 | 45.6%Bush135 | 32.1%Perot95 | 296 | ||
| R | 30.1%Dukakis91 | 67.5%Bush204 | 2.3%Paul7 | 302 | ||
| R | 24.8%Mondale86 | 74.4%Reagan258 | 0.9%Bergland3 | 347 | ||
| R | 26.4%Carter90 | 66.0%Reagan225 | 7.6%Anderson26 | 341 | ||
| R | 33.2%Carter110 | 63.7%Ford211 | 3.0%Anderson10 | 331 | ||
| R | 26.8%McGovern87 | 71.4%Nixon232 | 1.8%Schmitz6 | 325 | ||
| R | 29.3%Humphrey98 | 63.0%Nixon211 | 7.8%Wallace26 | 335 | ||
| D | 52.4%Johnson210 | 47.4%Goldwater190 | 0.2%Hass1 | 401 | ||
| R | 46.4%Kennedy221 | 53.6%Nixon255 | 0.0% | 476 | ||
| R | 44.3%Stevenson205 | 55.7%Eisenhower258 | 0.0% | 463 | ||
| R | 32.7%Stevenson155 | 67.3%Eisenhower319 | 0.0% | 474 | ||
| D | 51.0%Truman235 | 46.4%Dewey214 | 2.6%Thurmond12 | 461 | ||
| R | 46.8%Roosevelt225 | 52.6%Dewey253 | 0.6%Thomas3 | 481 | ||
| D | 50.1%Roosevelt316 | 49.6%Willkie313 | 0.3%Thomas2 | 631 | ||
| D | 64.9%Roosevelt523 | 32.0%Landon258 | 3.1%Lemke25 | 806 | ||
| D | 58.9%Roosevelt544 | 38.0%Hoover351 | 3.1%Thomas29 | 924 | ||
| R | 38.6%Smith372 | 60.9%Hoover586 | 0.5%Thomas5 | 963 | ||
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presidential history
Presidential margin, 1928–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1928 | −22.2% |
| 1932 | +20.9% |
| 1936 | +32.9% |
| 1940 | +0.5% |
| 1944 | −5.8% |
| 1948 | +4.6% |
| 1952 | −34.6% |
| 1956 | −11.4% |
| 1960 | −7.1% |
| 1964 | +5.0% |
| 1968 | −33.7% |
| 1972 | −44.6% |
| 1976 | −30.5% |
| 1980 | −39.6% |
| 1984 | −49.6% |
| 1988 | −37.4% |
| 1992 | −25.0% |
| 1996 | −42.8% |
| 2000 | −71.2% |
| 2004 | −59.2% |
| 2008 | −53.0% |
| 2012 | −64.1% |
| 2016 | −77.0% |
| 2020 | −74.4% |
| 2024 | −76.2% |
DemocraticRepublican
voter registration
Registered voters
Total registered voters, over time
Registered voters
| Year | Total registered |
|---|---|
| 2016 | 426 |
| 2018 | 421 |
| 2020 | 390 |
| 2022 | 380 |
| 2024 | 372 |
Source: U.S. Election Assistance Commission (EAVS)
With fewer than 500 residents spread across high-plains ranch land, Petroleum County consistently posts some of the most lopsided Republican margins in the nation — the 2024 gap of 76 points reflects both its demographic uniformity and extreme rural isolation.
Across the recorded series it reached a Democratic high of 32.9 points in 1936 and a Republican high of 77.0 points in 2016. Between 2020 and 2024 the county moved 1.8 points toward the Republican candidate; the 2024 margin was 76.2 points.
A population of 447, a 99% non-Hispanic-white share, and a median household income of $60,208 describe the county. The county's voting pattern over the last decade is most similar to that of Fergus County and Blanco County.
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All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Petroleum County, Montana. Akashic. https://akashic.app/county/30069/. Accessed May 20, 2026. License: CC BY 4.0.
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Frequently asked questions
How did Petroleum County, Montana vote in 2024?
In 2024, Petroleum County, Montana voted Republican by 76.2 points (R+76.2), carried by the Republican candidate. Out of 324 votes cast, 37 went Democratic and 284 went Republican.
When did Petroleum County, Montana last vote Democratic?
The most recent presidential election in which Petroleum County, Montana voted Democratic was 1964.
How many people live in Petroleum County, Montana?
Petroleum County, Montana has a population of 447 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Petroleum County, Montana?
Median household income in Petroleum County, Montana is $60,208 — below the national median of $80,734. The Montana state median is $72,509.
What is the political history of Petroleum County, Montana?
Akashic tracks 38 presidential elections in Petroleum County, Montana from 1876 to 2024. Of those, 5 went Democratic and 20 went Republican.