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Illinois's 12th U.S. House District

Illinois · Next election 2026 · 2 active candidates · $1.4M raisedFederal
About This Office

U.S. House seat for Illinois's 12th congressional district. Representatives serve two-year terms.

Total Seats
435
Term Length
2 years
Salary
$174,000
Current Officeholders
Rep. Mike Bost
Rep. Mike BostR
U.S. Representative · IL-012
Tenure
11y
Bills Spon.
25
Votes Missed
1.71%
Cross-party
75
Committees
ChairVeterans' Affairs Committee
Agriculture Committee
Transportation and Infrastructure Committee
+4 more
The 2026 Race

3 candidates filed, 2 active for the 2026 House election in Illinois District 12. Party primary on Mar 17, 2026. General election on Nov 3, 2026.

Primary
Mar 17, 2026
General
Nov 3, 2026
Total Raised
$1.4M
Candidates
2 active / 3 filed
Incumbent
Mike Bost (R-IL-12)R
Cash on Hand
$850K
Election History
YearWinnerResultRunner-UpTotal Votes
2024Mike Bost R74.2%Brian Roberts D 25.8%367,629
2022Mike Bost R75.0%Homer “Chip” Markel D 25.0%291,170
2020Mike Bost R60.4%Raymond C Lenzi D 39.6%322,416
2018Mike Bost R51.6%Brendan Kelly D 45.4%261,543
2016Mike Bost R54.3%Charles \"C J\" Baricevic D 39.7%313,002
2014Mike Bost R52.5%William L Enyart D 41.9%209,738
2012William L Enyart D51.7%Jason Plummer R 42.7%303,947
2010Jerry F Costello D59.8%Teri Newman R 36.5%202,705
2008Jerry F Costello D71.4%Timmy Jay Richardson Jr R 24.9%298,180
2006Jerry F Costello D100.0%—157,284
2004Jerry F Costello D69.5%Erin R Zweigart R 28.9%286,433
2002Jerry F Costello D69.2%David Sadler R 30.8%190,020
2000Jerry F Costello D100.0%—183,208
1998Jerry F Costello D60.4%William Melvin Price R 39.6%165,014
1996Jerry F Costello D71.6%Shapley R Hunter R 26.6%209,519
District
Population
746,831
Median HH Income
$69K
Unemployment
4.6%
Bachelor's+
24.4%
Veterans
8.6%
Median Age
41.6
Mean HH Income
$90K
Poverty Rate
13.1%
HS or Higher
91.7%
Median Home Value
$151K
Median Rent
$835/mo
Owner-Occupied
75.0%
Under 18 / 65+
21.6% / 19.9%