Mercer County, Illinois

What we have for Mercer County today, and what is coming.

Basics

County code (FIPS): 17131
Land area: 561 square miles
Population: 15,699

Federal money spent here

Fiscal year 2026: $126.7 million in federal contracts, grants, loans and other awards for work done in Mercer County.

Explore on USAspending.gov

Who represents Mercer County

U.S. Senate (whole state): Richard J. Durbin (Democrat), Tammy Duckworth (Democrat).

U.S. House districts that include part of this county

District	Member	Share of county land
Congressional District 15	Mary E. Miller (Republican)	61.3%
Congressional District 17	Eric Sorensen (Democrat)	38.7%

State senate districts

District	Member	Share of county land
State Senate District 47	Neil Anderson (Republican)	74.4%
State Senate District 36	Mike Halpin (Democratic)	25.6%

State house / assembly districts

District	Member	Share of county land
State House District 94	Norine Hammond (Republican)	74.4%
State House District 71	Dan Swanson (Republican)	25.6%

Matched by district number using the U.S. Census Bureau 2020 county–district relationship files (land area overlap; districts may have been redrawn since). Your exact district depends on your address: U.S. House · state legislators.

County government

Find the official county website and contacts in the USA.gov local government directory or the National Association of Counties explorer.

Coming next for counties: county commission meetings and agendas, county budgets, local ballot measures and election results. We add each one as soon as a public, reliable feed exists for it. Know a good source? Tell us.

Sources: U.S. Census Bureau Gazetteer (county list, public domain); USAspending.gov (U.S. Treasury). Built 2026-11-03 15:28.