Rock County

Anderson
Beloit
Bergen
Clinton
Edgerton
Evansville
Footville
Fulton
Janesville
Johnstown
Magnolia
Milton
Newark
Orfordville
Tiffany
HASC code :US-WI-RO
FIPS 6-4 code :55105
Capital :Janesville
Largest city :Janesville
Elevation :High : Bergen 960 ft
Low : Beloit 780 ft
Population :152,307
Land Area :721 sq mi
(1,867 km²)
Density :211.24/sq mi
(81.56/km²)
Time zone :UTC -6
Website :http://www.co.rock.wi.us