2024
R+33.6marginDonald TrumpRep
40,248
66.4%
Kamala HarrisDem
19,842
32.7%
All other candidates
560
0.9%
60,650 ballots cast · 56.6 per 100 residents (2024 population estimate)
Residents107,155+3.2% since 2020 (+3,341 people)
Adams County
Pennsylvania·FIPS 42001·107,594 residents (2025 estimate)
2024 result
R+33.6
60,650 ballots cast
What happened: the county's margin each cycle, against the national result.
Lean vs. nation
R+32.4
How this county sits relative to the country in 2024, with the national environment removed.
Trend since 2000
-3.6 pts
Net movement of that lean across 7 cycles — toward Republicans.
Elasticity
1.06
Moves roughly in step with the country.
Bellwether error
33.1
Average gap between this county's margin and the nation's.
Votes by candidate
7 cyclesCertified vote counts for each party's nominee, the combined total for everyone else on the ballot, the number of ballots cast, and how many people lived here at the time.
2020
R+34.2marginDonald TrumpRep
37,523
66.4%
Joe BidenDem
18,207
32.2%
All other candidates
810
1.4%
56,540 ballots cast · 54.5 per 100 residents (2020 population estimate)
Residents103,814+1.9% since 2016 (+1,903 people)
Measured across a change of Census vintage. The two series share no common year, so how far apart they sit cannot be measured — this change carries an unknown amount of revision on top of four years of real change.
2016
R+36.2marginDonald TrumpRep
31,423
66.2%
Hillary ClintonDem
14,219
29.9%
All other candidates
1,847
3.9%
47,489 ballots cast · 46.6 per 100 residents (2016 population estimate)
Residents101,911+0.7% since 2012 (+657 people)
2012
R+27.5marginMitt RomneyRep
26,767
63.0%
Barack ObamaDem
15,091
35.5%
All other candidates
599
1.4%
42,457 ballots cast · 41.9 per 100 residents (2012 population estimate)
Residents101,254+0.2% since 2008 (+198 people)
Measured across a change of Census vintage. Where the two vintages overlap, 96% of counties agree within 0.5%, so read this figure to about half a point and no finer.
2008
R+19.6marginJohn McCainRep
26,349
59.2%
Barack ObamaDem
17,633
39.6%
All other candidates
507
1.1%
44,489 ballots cast · 44.0 per 100 residents (2008 population estimate)
Residents101,056+3.9% since 2004 (+3,756 people)
2004
R+34.3marginGeorge W. BushRep
28,247
66.9%
John KerryDem
13,764
32.6%
All other candidates
217
0.5%
42,228 ballots cast · 43.4 per 100 residents (2004 population estimate)
Residents97,300+6.4% since 2000 (+5,843 people)
2000
R+27.4marginGeorge W. BushRep
20,848
62.4%
Al GoreDem
11,682
34.9%
All other candidates
903
2.7%
33,433 ballots cast · 36.6 per 100 residents (2000 population estimate)
Residents91,457
“All other candidates” is every remaining line on the presidential ballot combined — minor parties, independents and write-ins where the state reports them. Shares are of all ballots cast, so the three rows sum to 100%.
Ballots cast per 100 residents is not a turnout rate. It measures votes against every resident — children and non-citizens included — not against eligible or registered voters, which is what turnout means and which this site does not have a county-level figure for. It is shown only where an election year and a population estimate share the same year and describe the same territory; where the Census figure is stated on boundaries the vote was not cast on, the card says so and the ratio is withheld.
A change in residents is not a change in voters. The percentage beside each year is the change in resident population since the previous presidential election — everyone who lives here, including children and non-citizens. It is not turnout, not registration, and not the same quantity as the change in ballots cast. Population is measured on 1 July of the election year, four months before the vote, which is the closest an annual series gets to election day.
Population figures on this page come from 3 Census series: PEP intercensal county estimates, 2000–2010; PEP vintage 2019 county estimates, 2010–2019; PEP vintage 2025 county estimates, 2020–2025. The 2012 and 2020 figures are the first in a new series, so the change shown for those years is measured across a change of Census method as well as across four years. Each of those cards says so. Two figures drawn from different vintages are not two readings of one series.
Every cycle
| Year | Margin | Lean | Swing | Rel. swing | Votes | 3rd party |
|---|---|---|---|---|---|---|
| 2024 | R+33.6 | R+32.4 | +0.7 | +6.8 | 60,650 | 0.9% |
| 2020 | R+34.2 | R+39.2 | +3.0 | +0.7 | 56,540 | 1.4% |
| 2016 | R+36.2 | R+39.9 | -9.8 | -8.0 | 47,489 | 3.9% |
| 2012 | R+27.5 | R+31.9 | -8.1 | -4.7 | 42,457 | 1.4% |
| 2008 | R+19.6 | R+27.2 | +14.7 | +4.8 | 44,489 | 1.1% |
| 2004 | R+34.3 | R+32.0 | -6.3 | -3.2 | 42,228 | 0.5% |
| 2000 | R+27.4 | R+28.8 | — | — | 33,433 | 2.7% |
Margin is over all votes cast. Lean is the two-party margin minus the nation's — the county's own position with the national environment removed. Relative swing is the change in that lean. “Votes” is the number of ballots cast in the presidential contest, not a share of eligible voters.
Counties on a similar trajectory
Sources
Presidential returns from the MIT Election Data and Science Lab (County Presidential Returns 2000–2024, CC0). Geography and FIPS codes from the US Census Bureau (public domain). Where a state reports both a total and per-mode vote counts, the reported total is used.
Resident population from the US Census Bureau, Population Estimates Program (Vintage 2025), measured as of July 1, 2025. Resident population — all residents, including children and non-citizens. Not an electorate, and not comparable to a vote total as a turnout rate. Conclusions drawn from it are ours, not the Bureau's.
Population at each election is measured on 1 July of the election year and comes from the US Census Bureau's Population Estimates Program (public domain). The 2000–2024 span is covered by several separately estimated vintages of that programme rather than by one continuous series — the ones used on this page are named under the cycle cards, and every change measured across a boundary between them is marked there. Notes about territory changing hands come from this site's own change ledger and are only as complete as it is.