Warren County Illinois Map and Data

Warren County Illinois Boundary Map

Warren County Illinois Profile and Data

NameWarren County
StateIllinois
FIPS Code17187
County SeatMonmouth
TimezoneCentral Daylight Time (CDT)
Population (2024)16,224
Population Growth Rate(2020-2024)-3.81%
Majority EthnicityWhite 82.82%
Public School Majority EthnicityWhite 67%
Partisan Voting IndexRepublican:+12
Unemployment Rate (May 2026)5.0%
Sales Tax Rate (2025)8%
Area Code(s)309

Warren County Race/Ethnicity Data

Race/EthnicityPercentage of Population (2023)
White82.82%
African American2.73%
Hispanic10.54%
Asian2.35%
Native American1.17%
Hawaiin/Pacific Islander0.38%

Warren County Public School Race/Ethnicity Data

Race/EthnicityPercentage of Public School Students (2023)
White66.61%
African American3.79%
Hispanic20.83%
Asian2.84%
Native American0.09%
Hawaiin/Pacific Islander0.17%
2026 zipdatamaps.com