Map of Rock Island County, Illinois

Rock Island County is a county located in the U.S. state of Illinois, bounded on the west by the Mississippi River. According to the 2010 census, it had a population of 147,546. Its county seat is Rock Island; its largest city is neighboring Moline. Rock Island County is one of the four counties that make up the Davenport–Moline-Rock Island, IA-IL Metropolitan Statistical Area.

Rock Island County overview:
Name:	Rock Island County
FIPS code:	17-161
State:	Illinois
Founded:	1831
Named for:	Rock (Arsenal) Island
Seat:	Rock Island
Largest city:	Moline
Total Area:	451 sq mi (1,170 km²)
Land Area:	428 sq mi (1,110 km²)
Total Population:	147,546
Population Density:	330/sq mi (130/km²)
Time zone:	UTC−6 (Central)
Summer Time Zone (DST):	UTC−5 (CDT)
Website:	rockislandcountyil.gov

Rock Island County location map. Where is Rock Island County?

Rock Island County location on the U.S. Map. Where is Rock Island County. — Location of Rock Island County in the the United States.

Rock Island County location on the Illinois map. Where is Rock Island County. — Location of Rock Island County in Illinois.

History

Rock Island County was formed in 1831 out of Jo Daviess County. It was named for Rock Island, an island in the Mississippi River now known as Arsenal Island. The Rock River (which the Sauk and Fox Indians called Sinnissippi, meaning “rocky waters”) flows from Whiteside County and points further east and north and joins the Mississippi River at Rock Island. The Sinnissippi Mounds, dating from the Hopewell period and on the National Register of Historic Places are upriver at Sterling in Whiteside County.

Rock Island County Road Map

Rock Island CountyStreet Map. — Street map of Rock Island County, Illinois. Source: OpenStreetMap (OSM)

Rock Island CountyMap — Rock Island Countypolitical map.

Geography

According to the U.S. Census Bureau, the county has a total area of 451 square miles (1,170 km), of which 428 square miles (1,110 km) is land and 24 square miles (62 km) (5.2%) is water.

Climate and weather

In recent years, average temperatures in the county seat of Rock Island have ranged from a low of 13 °F (−11 °C) in January to a high of 85 °F (29 °C) in July, although a record low of −22 °F (−30 °C) was recorded in February 1996 and a record high of 103 °F (39 °C) was recorded in July 2006. Average monthly precipitation ranged from 1.28 inches (33 mm) in January to 4.75 inches (121 mm) in June.

Major highways

Interstate 74
Interstate 80
Interstate 88
Interstate 280
U.S. Highway 6
U.S. Highway 67
U.S. Highway 150
Illinois Route 2 (formerly)
Illinois Route 5
Illinois Route 84
Illinois Route 92
Illinois Route 94
Illinois Route 110
Illinois Route 192

Transit

Quad Cities MetroLINK
List of intercity bus stops in Illinois

Adjacent counties

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)

National protected area

Upper Mississippi River National Wildlife and Fish Refuge (part)