'Rock County' definitions:

Rock -- U.S. County in Minnesota

From: Gazetteer 2000
Name :
Rock -- U.S. County in Minnesota
Population (2000) :
9721
Housing Units (2000) :
4137
Land area (2000) :
482.609501 sq. miles (1249.952815 sq. km)
Water area (2000) :
0.233498 sq. miles (0.604756 sq. km)
Total area (2000) :
482.842999 sq. miles (1250.557571 sq. km)
Located within :
Minnesota (MN), FIPS 27
Location :
43.667243 N, 96.242131 W

Rock -- U.S. County in Nebraska

From: Gazetteer 2000
Name :
Rock -- U.S. County in Nebraska
Population (2000) :
1756
Housing Units (2000) :
935
Land area (2000) :
1008.457758 sq. miles (2611.893491 sq. km)
Water area (2000) :
3.395633 sq. miles (8.794649 sq. km)
Total area (2000) :
1011.853391 sq. miles (2620.688140 sq. km)
Located within :
Nebraska (NE), FIPS 31
Location :
42.507127 N, 99.470110 W

Rock -- U.S. County in Wisconsin

From: Gazetteer 2000
Name :
Rock -- U.S. County in Wisconsin
Population (2000) :
152307
Housing Units (2000) :
62187
Land area (2000) :
720.468467 sq. miles (1866.004683 sq. km)
Water area (2000) :
5.728001 sq. miles (14.835453 sq. km)
Total area (2000) :
726.196468 sq. miles (1880.840136 sq. km)
Located within :
Wisconsin (WI), FIPS 55
Location :
42.654411 N, 89.049110 W