Henry County, Illinois

Henry County, Illinois
Location within the U.S. state of Illinois
Coordinates: 41°21′N 90°08′W / 41.35°N 90.14°W / 41.35; -90.14
Country United States
State Illinois
FoundedJanuary 13, 1825
Named afterPatrick Henry
SeatCambridge
Largest cityKewanee
Area
 • Total
826 sq mi (2,140 km2)
 • Land823 sq mi (2,130 km2)
 • Water2.7 sq mi (7.0 km2)  0.3%
Population
 (2020)
 • Total
49,284
 • Estimate 
(2024)
48,177
 • Density59.9/sq mi (23.1/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional districts16th, 17th
Websitewww.henrycty.com

Henry County is a county located in the U.S. state of Illinois. The 2020 United States census, listed its population at 49,284. Its county seat is Cambridge. Henry County is included in the Davenport-Moline-Rock Island, IA-IL Metropolitan Statistical Area.