Mercer, New Jersey — Presidential Election Results
Mercer, New Jersey has voted Democratic in 7 of the last 7 presidential elections on record (2000–2024). In 2024, it was 28.6 pts more Dem. than New Jersey overall.
Jump to year: 2000 · 2004 · 2008 · 2012 · 2016 · 2020 · 2024
Full Election History, 2000–2024
| Year | Winner | Party | Votes | Vote Share | Margin | Total Votes Cast | Swing | Vs. New Jersey |
|---|---|---|---|---|---|---|---|---|
| 2000 | Al Gore | Democratic | 83,256 | 61.4% | 27.0 pts (36,586 votes) | 135,559 | — | 11.7 pts more Dem. |
| 2004 | John Kerry | Democratic | 91,580 | 61.3% | 23.4 pts (34,976 votes) | 149,510 | -4.6 pts | 16.8 pts more Dem. |
| 2008 | Barack Obama | Democratic | 107,926 | 68.1% | 36.4 pts (57,703 votes) | 158,549 | +12.9 pts | 20.8 pts more Dem. |
| 2012 | Barack Obama | Democratic | 104,377 | 68.0% | 37.1 pts (57,022 votes) | 153,511 | +1.1 pts | 19.6 pts more Dem. |
| 2016 | Hillary Clinton | Democratic | 104,775 | 66.9% | 37.4 pts (58,582 votes) | 156,529 | +1.2 pts | 24.2 pts more Dem. |
| 2020 | Joseph R Biden Jr | Democratic | 122,532 | 69.4% | 40.1 pts (70,891 votes) | 176,604 | +1.9 pts | 24.6 pts more Dem. |
| 2024 | Kamala D Harris | Democratic | 107,558 | 65.9% | 33.9 pts (55,284 votes) | 163,270 | -6.1 pts | 28.6 pts more Dem. |
Population Context
Total Census Bureau population estimate for the county that year, and recorded votes as a share of that total population. This is a population-based figure, not a turnout rate against eligible or registered voters, which this site does not calculate.
| Year | County Population | Votes Cast (% of Population) |
|---|---|---|
| 2000 | 351,465 | 38.6% of population |
| 2004 | 361,248 | 41.4% of population |
| 2008 | 364,119 | 43.5% of population |
| 2012 | 368,554 | 41.7% of population |
| 2016 | 367,699 | 42.6% of population |
| 2020 | 386,492 | 45.7% of population |
| 2024 | 392,138 | 41.6% of population |
Trend
Between 2000 and 2024, the two-party presidential margin in Mercer shifted 6.4 points toward the Democratic candidate, based on recorded county returns. This reflects the vote totals in this dataset only; no claim is made here about the causes of that shift.
Margin Over Time
Democratic candidate's margin (percentage points, two-party vote share). Positive values favor the Democratic candidate; negative values favor the Republican candidate.
Bellwether Status
Mercer has matched the national popular winner in 3 of the last 7 presidential elections (43%), and New Jersey's own statewide winner in 7 of 7 (100%). Compare every county on the bellwether counties page.
Related Pages
Other New Jersey Counties
Frequently Asked Questions
How has Mercer voted in presidential elections since 2000?
Since 2000, Mercer has voted Democratic in 7 of 7 recorded presidential elections and Republican in 0 of 7, based on county-level returns through 2024.
What was the closest presidential election in Mercer?
Mercer's closest recorded margin was in 2004, when John Kerry (Democratic) won by 23.6 points (34,976 votes) out of 149,510 total votes cast.
Has Mercer ever flipped between parties?
Not in the 2000-2024 record on this page -- Mercer has voted for the same party in every recorded presidential election in that span.
What is the largest presidential election margin recorded in Mercer?
The widest margin on record for Mercer was in 2020, when Joseph R Biden Jr (Democratic) won by 40.7 points.
How many votes were cast in Mercer relative to its population?
In 2024, 163,270 votes were recorded in Mercer against a total population of 392,138 (41.6% of the total population). This is a population-based figure, not a turnout rate against eligible or registered voters, which this site does not calculate.
Is Mercer a presidential bellwether county?
Mercer has matched the national popular winner in 3 of the last 7 presidential elections (43%), and New Jersey's own statewide winner in 7 of 7 (100%).