'Rock Island County, IL' definitions:
Rock Island -- U.S. County in Illinois
From: Gazetteer 2000
Name :
Rock Island -- U.S. County in Illinois
Population (2000) :
149374
Housing Units (2000) :
64489
Land area (2000) :
426.751273 sq. miles (1105.280677 sq. km)
Water area (2000) :
24.404944 sq. miles (63.208511 sq. km)
Total area (2000) :
451.156217 sq. miles (1168.489188 sq. km)
Located within :
Illinois (IL), FIPS 17
Location :
41.491433 N, 90.507532 W