'Jefferson County, IN' definitions:

Jefferson -- U.S. County in Indiana

From: Gazetteer 2000
Name :
Jefferson -- U.S. County in Indiana
Population (2000) :
31705
Housing Units (2000) :
13386
Land area (2000) :
361.365148 sq. miles (935.931397 sq. km)
Water area (2000) :
1.575824 sq. miles (4.081365 sq. km)
Total area (2000) :
362.940972 sq. miles (940.012762 sq. km)
Located within :
Indiana (IN), FIPS 18
Location :
38.766912 N, 85.436056 W