'Ionia County, MI' definitions:

Ionia -- U.S. County in Michigan

From: Gazetteer 2000
Name :
Ionia -- U.S. County in Michigan
Population (2000) :
61518
Housing Units (2000) :
22006
Land area (2000) :
573.213835 sq. miles (1484.616954 sq. km)
Water area (2000) :
7.017770 sq. miles (18.175940 sq. km)
Total area (2000) :
580.231605 sq. miles (1502.792894 sq. km)
Located within :
Michigan (MI), FIPS 26
Location :
42.958883 N, 85.079273 W