County record · fips 08013 · Colorado
BoulderCO
Democratic ×10 since 1988reported 1880–2024 · 37 elections
The Long Record
37 elections against the Colorado and national vote
2024 result
D+57.3
won by Democrats
Record since first cycle
18–19
Dem–Rep two-party wins
Voted with the winner
22/37
60% of its elections
Closest election
1932
D+6.1
this countyColoradonational (official)dot colour = two-party winner · hollow = tie or unknown total · click a dot to open that election
The Biggest Swings
Cycle-over-cycle change in the two-party margin, in points
| Election | Swing | Toward |
|---|---|---|
| 1896 | +170.9 pts | Democrats |
| 1892 | -83.6 pts | Republicans |
| 1900 | -54.9 pts | Republicans |
| 1920 | -51.4 pts | Republicans |
| 1932 | +42.9 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
328,961
College (BA+)
64%
Median income
$103,994
2024 dollars
Non-white
25%
Rural
9%
Age 65+
16%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Broomfield, CO · Gilpin, CO · Grand, CO · Jefferson, CO · Larimer, CO · Weld, CO