Jefferson County

Aztalan
Cambridge
Cold Spring
Concord
Farmington
Fort Atkinson
Hebron
Helenville
Ixonia
Jefferson
Johnson Creek
Koshkonong
Lake Koshkonong
Lake Lac La Belle
Lake Mills
Lake Ripley
Milford
Oakland
Palmyra
Portland
Rome
Sullivan
Waterloo
Watertown
HASC code :US-WI-JE
FIPS 6-4 code :55055
Capital :Jefferson
Largest city :Watertown
Elevation :High : Farmington 872 ft
Low : Lake Lac La Belle 0 ft
Population :74,021
Land Area :557 sq mi
(1,443 km²)
Density :132.89/sq mi
(51.31/km²)
Time zone :UTC -6
Website :http://www.co.jefferson.wi.us