Rock County

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
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

WCA District: Southern