Rock County
Town of Evansville, Rock County; Photographer: Suzanne Fryda
County Seat:
Janesville
Address:
51 S. Main St.
City:
Janesville
Zip:
53545
Phone:
608-757-5660
Website:
http://www.co.rock.wi.us
Land Area:
720.5 sq. miles
Elevation:
858 ft. at Janesville
Number of Lakes:
6
Area in Lakes:
1,954 acres (3.05 sq. miles)
Rivers:
Rock, Sugar, Yahara
Major Watershed:
Rock River
Geographical Province:
North and East: Eastern Ridges and Lowlands; Central and Southwest: Western Upland
Vegetation:
Bur oak, white oak and bluestem throughout. South, Central, West Central and North Central: Areas of sugar maple. Northwest: Narrow strip of white, black and red oak. Southeast corner: Willow, soft maple and ash.
Population:
1930: 74,206
1970: 131,970
1980: 139,420
1990: 139,510
2000: 152,307
2010: 160,331
2020: 163,687
WCA District:
Southern
