'Jackson County, MI' definitions:

Jackson -- U.S. County in Michigan

From: Gazetteer 2000
Name :
Jackson -- U.S. County in Michigan
Population (2000) :
158422
Housing Units (2000) :
62906
Land area (2000) :
706.597484 sq. miles (1830.079005 sq. km)
Water area (2000) :
17.167247 sq. miles (44.462965 sq. km)
Total area (2000) :
723.764731 sq. miles (1874.541970 sq. km)
Located within :
Michigan (MI), FIPS 26
Location :
42.237635 N, 84.404455 W