2024
R+19.2marginDonald TrumpRep
12,461
58.0%
Kamala HarrisDem
8,329
38.8%
All other candidates
699
3.3%
21,489 ballots cast · 50.6 per 100 residents (2024 population estimate)
Residents42,490−3.4% since 2020 (−1,493 people)
Siskiyou County
California·FIPS 06093·42,013 residents (2025 estimate)
2024 result
R+19.2
21,489 ballots cast
What happened: the county's margin each cycle, against the national result.
Lean vs. nation
R+18.4
How this county sits relative to the country in 2024, with the national environment removed.
Trend since 2000
+14.0 pts
Net movement of that lean across 7 cycles — toward Democrats.
Elasticity
1.33
Moves roughly in step with the country.
Bellwether error
22.1
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+15.8marginDonald TrumpRep
13,290
56.6%
Joe BidenDem
9,593
40.9%
All other candidates
589
2.5%
23,472 ballots cast · 53.4 per 100 residents (2020 population estimate)
Residents43,983+1.4% since 2016 (+607 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+20.0marginDonald TrumpRep
11,341
55.3%
Hillary ClintonDem
7,234
35.3%
All other candidates
1,917
9.4%
20,492 ballots cast · 47.2 per 100 residents (2016 population estimate)
Residents43,376−1.6% since 2012 (−703 people)
2012
R+15.2marginMitt RomneyRep
11,077
55.6%
Barack ObamaDem
8,046
40.4%
All other candidates
787
4.0%
19,910 ballots cast · 45.2 per 100 residents (2012 population estimate)
Residents44,079−1.6% since 2008 (−701 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+10.4marginJohn McCainRep
11,520
53.7%
Barack ObamaDem
9,292
43.3%
All other candidates
658
3.1%
21,470 ballots cast · 47.9 per 100 residents (2008 population estimate)
Residents44,780+0.9% since 2004 (+386 people)
2004
R+23.0marginGeorge W. BushRep
12,673
60.7%
John KerryDem
7,880
37.8%
All other candidates
310
1.5%
20,863 ballots cast · 47.0 per 100 residents (2004 population estimate)
Residents44,394+0.4% since 2000 (+176 people)
2000
R+29.6marginGeorge W. BushRep
12,198
61.5%
Al GoreDem
6,323
31.9%
All other candidates
1,298
6.5%
19,819 ballots cast · 44.8 per 100 residents (2000 population estimate)
Residents44,218
“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+19.2 | R+18.4 | -3.7 | +2.3 | 21,489 | 3.3% |
| 2020 | R+15.8 | R+20.7 | +6.0 | +3.6 | 23,472 | 2.5% |
| 2016 | R+20.0 | R+24.3 | -6.3 | -4.5 | 20,492 | 9.3% |
| 2012 | R+15.2 | R+19.9 | -5.1 | -1.8 | 19,910 | 4.0% |
| 2008 | R+10.4 | R+18.1 | +12.6 | +2.8 | 21,470 | 3.1% |
| 2004 | R+23.0 | R+20.8 | +8.4 | +11.5 | 20,863 | 1.5% |
| 2000 | R+29.6 | R+32.4 | — | — | 19,819 | 6.5% |
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.