'Marion County, IN' definitions:

Marion -- U.S. County in Indiana

From: Gazetteer 2000
Name :
Marion -- U.S. County in Indiana
Population (2000) :
860454
Housing Units (2000) :
387183
Land area (2000) :
396.248885 sq. miles (1026.279857 sq. km)
Water area (2000) :
6.789975 sq. miles (17.585955 sq. km)
Total area (2000) :
403.038860 sq. miles (1043.865812 sq. km)
Located within :
Indiana (IN), FIPS 18
Location :
39.792792 N, 86.141810 W