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Know Our Community

Marion County By the Numbers

A snapshot of the community we serve, drawn from U.S. Census Bureau data. Understanding Marion County helps us engage, educate, and empower every neighborhood.

37,729Residents (2020 Census)
About 42Median age (years)
~$60,800Median household income
SalemCounty seat, est. 1823
Community Snapshot

A Closer Look

Approximate figures from the U.S. Census Bureau (2020 Census and American Community Survey estimates).

Population & Geography

About 37,700 residents across roughly 572 square miles, anchored by Salem, the county seat, and Centralia, the largest city.

Community Makeup

Approximately 89% White, 4% Black, 3% two or more races, and 2% Hispanic or Latino residents, with a median age near 42.

Households & Income

Median household income near $60,800, with roughly 11% of families below the poverty line, reflecting a hardworking rural community.

17,803Ballots cast, 2024 president
73.85%Voted Republican, 2024
+4.5 ptsGOP share rise since 2016
Solid RedRepublican-leaning county
How We Vote

Recent Election Participation

Presidential election results for Marion County, Illinois (official county results).

2024 Presidential

17,803 ballots cast: 73.85% Republican, 24.50% Democratic.

2020 Presidential

17,494 ballots cast: 72.47% Republican, 25.86% Democratic.

2016 Presidential

17,098 ballots cast: 69.36% Republican, 25.55% Democratic.

Turnout Analysis

The Voter Opportunity

Comparing our population to actual ballots cast shows where conservative Marion County can grow its voice.

About 29,000 can vote

Of roughly 37,700 residents, an estimated 29,000 are voting-age adults, based on U.S. Census age data.

17,803 voted in 2024

That is about 61% of voting-age adults casting a ballot in the presidential election.

About 11,600 did not

Roughly 4 in 10 eligible adults sat out. Registering and turning out every conservative voter is our opportunity.

About This Data

Population figures are drawn from the U.S. Census Bureau, including the 2020 Decennial Census and American Community Survey estimates, and are approximate. They update periodically as new estimates are released.

Election figures are official Marion County presidential results, reported through the Illinois State Board of Elections and the Marion County Clerk. Marion County has voted Republican in recent presidential elections, with the Republican share rising from about 69% in 2016 to about 74% in 2024.

The turnout analysis compares official ballots cast to an estimated voting-age population, about 78% of residents based on Census age data, so those figures are approximate. Exact voter registration counts are maintained by the Marion County Clerk and the Illinois State Board of Elections.

We share this so every neighbor understands what is at stake, and how much Marion County turnout matters to the whole state. For the most current data, see the official sources below.

Official Sources

Census & Election Data

View the full demographic profile and official Illinois election data for Marion County.

The Gap Is Closing

We Can Do It, Together.

Illinois Republicans are gaining fast: Trump lost the state by 1,025,024 votes in 2020, but by just 613,784 in 2024 — over 400,000 votes closer in four years. Marion County backs our candidates by more than 70 percent, yet still left about 11,600 eligible votes uncast. Multiply that across the ninety-plus counties we carry downstate, and the statewide margin disappears. Chicago does not decide our future. The votes are already here — we just have to cast them.