Mercer County, New Jersey
AkashicMercer County, NJHarrisD+33.9
2024 precinct map of Mercer CountyPrecinct-level 2024 presidential results for Mercer 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
| Kamala Harris ✓Democratic | 65.9% | 107,558 |
|---|---|---|
| Donald TrumpRepublican | 32.0% | 52,274 |
| Jill SteinGreen | 0.9% | 1,391 |
Harris +50Trump +50
243 precincts · 163,270 votes. Hover any precinct for its result.
The precinct map shows the 2024 presidential vote; the timeline scrubs the county’s overall result across 1892–2024.
38 presidential elections
| Year | Won | Democratic | Republican | Other | Margin | Total |
|---|---|---|---|---|---|---|
| D | 65.9%Harris107,558 | 32.0%Trump52,274 | 0.9%Stein1,391 | 163,270 | ||
| D | 69.8%Biden122,532 | 29.4%Trump51,641 | 0.8%Jorgensen1,427 | 175,600 | ||
| D | 66.3%Clinton104,775 | 29.2%Trump46,193 | 2.1%Johnson3,267 | 158,058 | ||
| D | 67.2%Obama104,377 | 30.5%Romney47,355 | 0.6%Johnson915 | 155,355 | ||
| D | 67.4%Obama107,926 | 31.4%McCain50,223 | 1.2%Nader1,890 | 160,039 | ||
| D | 61.3%Kerry91,580 | 37.9%Bush56,604 | 0.9%Other1,326 | 149,510 | ||
| D | 61.4%Gore83,256 | 34.4%Bush46,670 | 3.4%Nader4,561 | 135,559 | ||
| D | 58.9%Clinton77,641 | 30.8%Dole40,559 | 8.0%Perot10,536 | 131,726 | ||
| D | 49.1%Clinton71,383 | 34.7%Bush50,473 | 15.5%Perot22,503 | 145,260 | ||
| D | 50.8%Dukakis68,712 | 48.3%Bush65,384 | 0.9%G.1,249 | 135,345 | ||
| R | 48.1%Mondale66,398 | 51.5%Reagan71,195 | 0.4%Holmes528 | 138,121 | ||
| D | 47.4%Carter60,888 | 41.6%Reagan53,450 | 11.1%Anderson14,244 | 128,582 | ||
| D | 53.2%Carter69,621 | 44.7%Ford58,453 | 2.1%McCarthy2,782 | 130,856 | ||
| R | 46.7%McGovern62,180 | 52.0%Nixon69,303 | 1.3%Schmitz1,708 | 133,191 | ||
| D | 50.4%Humphrey63,218 | 36.1%Nixon45,354 | 13.5%Wallace16,957 | 125,529 | ||
| D | 71.2%Johnson86,985 | 28.7%Goldwater35,081 | 0.1%Hass148 | 122,214 | ||
| D | 61.2%Kennedy74,166 | 38.7%Nixon46,924 | 0.1%Byrd179 | 121,269 | ||
| R | 48.3%Stevenson52,684 | 51.4%Eisenhower56,029 | 0.4%Andrews392 | 109,105 | ||
| D | 53.1%Stevenson57,751 | 46.4%Eisenhower50,423 | 0.4%Hallinan488 | 108,662 | ||
| D | 55.6%Truman49,690 | 42.3%Dewey37,794 | 2.2%Thurmond1,952 | 89,436 | ||
| D | 58.6%Roosevelt52,383 | 41.2%Dewey36,844 | 0.2%Thomas144 | 89,371 | ||
| D | 57.3%Roosevelt50,121 | 42.5%Willkie37,190 | 0.3%Thomas222 | 87,533 | ||
| D | 61.5%Roosevelt47,702 | 37.8%Landon29,283 | 0.7%Lemke579 | 77,564 | ||
| R | 45.3%Roosevelt30,284 | 50.4%Hoover33,715 | 4.3%Thomas2,880 | 66,879 | ||
| R | 40.2%Smith27,908 | 59.2%Hoover41,056 | 0.5%Thomas374 | 69,338 | ||
| R | 28.4%Davis14,639 | 59.5%Coolidge30,689 | 12.1%La Follette6,223 | 51,551 | ||
| R | 33.7%Cox15,713 | 63.5%Harding29,626 | 2.9%Debs1,344 | 46,683 | ||
| R | 41.7%Wilson10,621 | 55.8%Hughes14,213 | 2.6%Benson659 | 25,493 | ||
| D | 36.8%Wilson7,773 | 26.9%Taft5,676 | 36.3%Roosevelt7,671 | 21,120 | ||
| R | 36.7%Bryan9,289 | 59.0%Taft14,941 | 4.3%Debs1,099 | 25,329 | ||
| R | 34.9%Parker8,527 | 60.9%Roosevelt14,900 | 4.3%Debs1,040 | 24,467 | ||
| R | 34.9%Bryan7,858 | 61.7%McKinley13,874 | 3.4%Woolley766 | 22,498 | ||
| R | 28.8%Bryan5,970 | 66.8%McKinley13,847 | 4.3%Palmer901 | 20,718 | ||
| R | 47.5%Cleveland9,348 | 49.8%Harrison9,795 | 2.7%Weaver528 | 19,671 | ||
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presidential history
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −2.3% |
| 1896 | −38.0% |
| 1900 | −26.7% |
| 1904 | −26.0% |
| 1908 | −22.3% |
| 1912 | +9.9% |
| 1916 | −14.1% |
| 1920 | −29.8% |
| 1924 | −31.1% |
| 1928 | −19.0% |
| 1932 | −5.1% |
| 1936 | +23.7% |
| 1940 | +14.8% |
| 1944 | +17.4% |
| 1948 | +13.3% |
| 1952 | +6.7% |
| 1956 | −3.1% |
| 1960 | +22.5% |
| 1964 | +42.5% |
| 1968 | +14.2% |
| 1972 | −5.3% |
| 1976 | +8.5% |
| 1980 | +5.8% |
| 1984 | −3.5% |
| 1988 | +2.5% |
| 1992 | +14.4% |
| 1996 | +28.2% |
| 2000 | +27.0% |
| 2004 | +23.4% |
| 2008 | +36.1% |
| 2012 | +36.7% |
| 2016 | +37.1% |
| 2020 | +40.4% |
| 2024 | +33.9% |
DemocraticRepublican
Mercer County anchors New Jersey's political center of gravity around Trenton, returning Democratic presidential margins above 30 points in recent cycles while housing a mix of urban wards, suburban townships, and Princeton's academic community.
Across the recorded series it reached a Democratic high of 42.5 points in 1964 and a Republican high of 38.0 points in 1896. Between 2020 and 2024 the county moved 6.5 points toward the Republican candidate; the 2024 margin was 33.9 points.
A population of 385,864, a 43% non-Hispanic-white share, and a median household income of $100,645 describe the county. The county's voting pattern over the last decade is most similar to that of DeKalb County and Norfolk city.
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All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Mercer County, New Jersey. Akashic. https://akashic.app/county/34021/. Accessed May 20, 2026. License: CC BY 4.0.
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Frequently asked questions
How did Mercer County, New Jersey vote in 2024?
In 2024, Mercer County, New Jersey voted Democratic by 33.9 points (D+33.9), carried by the Democratic candidate. Out of 163,270 votes cast, 107,558 went Democratic and 52,274 went Republican.
When did Mercer County, New Jersey last vote Republican?
The most recent presidential election in which Mercer County, New Jersey voted Republican was 1984.
How many people live in Mercer County, New Jersey?
Mercer County, New Jersey has a population of 385,864 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Mercer County, New Jersey?
Median household income in Mercer County, New Jersey is $100,645 — above the national median of $80,734. The New Jersey state median is $103,556.
What is the political history of Mercer County, New Jersey?
Akashic tracks 38 presidential elections in Mercer County, New Jersey from 1876 to 2024. Of those, 21 went Democratic and 13 went Republican.