Rock Island County Map, Illinois

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Rock Island County, Illinois

Rock Island County sits at the western edge of Illinois, right where the Mississippi and Rock rivers meet. The Quad Cities straddle the Mississippi here, with Rock Island and Moline on the Illinois side. It’s right next to Iowa, which is to the west of the Mississippi River.

This place is part industrial, part college town. Augustana College is situated in Rock Island. But manufacturing has been the backbone of the economy for generations. John Deere still has a major presence here. Outside the cities, you’ll find rolling hills and farmland.

The Rock Island Arsenal, an active military base, dominates the actual Rock Island. The Quad City International Airport connects the area to the wider world. Black Hawk State Historic Site is Native American history on display. There’s a lot to this county.

Category	Details
County Name	Rock Island County
County Seat	Rock Island
Population	Approximately 145,000
Cities, Towns, and Communities	Moline, Rock Island, East Moline, Silvis, and several smaller communities
Interstates and Highways	Interstate 74, Interstate 280, U.S. Route 6, U.S. Route 67
FIPS Code	17-161
Total Area (Land and Water)	451 square miles (land: 418 sq mi, water: 33 sq mi)
Adjacent Counties (and Direction)	Clinton County, Iowa (North), Whiteside County (Northeast), Henry County (Southeast), Mercer County (South), Louisa County, Iowa (Southwest), Muscatine County, Iowa (West), Scott County, Iowa (northwest)
Time Zone	Central Time Zone (CT)
State	Illinois
Coordinates	41.4942° N, 90.5900° W
Etymology	Named after the Rock Island, a prominent island in the Mississippi River
Major Landmarks	The Rock Island Arsenal, Black Hawk State Historic Site, and the John Deere Pavilion
Website	Rock Island County Website