County record · fips 17161 · Illinois
Rock IslandIL
Democratic ×11 since 1984all 40 elections, 1868–2024
The Long Record
40 elections against the Illinois and national vote
2024 result
D+9.8
won by Democrats
Record since first cycle
21–19
Dem–Rep two-party wins
Voted with the winner
30/40
75% of its elections
Closest election
1960
D+1.9
this countyIllinoisnational (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 |
|---|---|---|
| 1876 | +81.8 pts | Democrats |
| 1872 | -78.3 pts | Republicans |
| 1912 | +51.8 pts | Democrats |
| 1916 | -44.5 pts | Republicans |
| 1920 | -42.2 pts | Republicans |
Who Lives Here
Census & ACS county profile, 2024
Population
142,757
College (BA+)
25%
Median income
$67,159
2024 dollars
Non-white
33%
Rural
12%
Age 65+
20%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Henry, IL · Mercer, IL · Whiteside, IL · Clinton, IA · Muscatine, IA · Scott, IA