Jefferson County
Johnson Creek, Jefferson County; Photographer: Michele Thielke
County Seat:
Jefferson
Address:
311 S. Center Avenue
City:
Jefferson
Zip:
53549
Phone:
920-674-7144
Website:
http://www.jeffersoncountywi.gov
Land Area:
557.1 sq. miles
Elevation:
795 ft. at Jefferson
Number of Lakes:
35
Area in Lakes:
3,770 acres (5.89 sq. miles)
Rivers:
Ashippun, Bark, Crawfish, Rock, Scuppernong
Major Watershed:
Rock River (East), Wisconsin River (North), Mississippi River (West)
Geographical Province:
Eastern Ridges and Lowlands
Vegetation:
East: Mostly sugar maple, basswood and elm. Southeast: Area of black spruce, tamarack and cedar. West: Oak savanna. Northwest and Southwest: Small areas of prairie bluestem and composites. West Central: Small area of sedge meadow.
Population:
1930: 36,785
1970: 60,060
1980: 66,152
1990: 67,783
2000: 74,021
2010: 83,686
2020: 84,900
WCA District:
Southern
