| County : | Jefferson County |
| State : | Wisconsin (WI) |
| Land Area : | 556.47 sq mi |
| Water Area : | 26.26 sq mi |
| Latitude : | 43.0138065 |
| Longitude : | -88.7739855 |
| Population (2010): | 83,686 |
| Population Estimate (2012) : | 83,751 |
| Population Density : | 150.39/sq mi |
| Housing Units (2012) : | 35,147 |
| Median Household Income (2012) : | $54,705 (Wisconsin : $52,627, USA : $53,046) |
| Median Family Income (2012) : | $67,651 (Wisconsin : $66,415, USA : $64,585) |
| Median House Price (2012) : | $183,300 (Wisconsin : $169,000, USA : $181,400) |
Jefferson County Cities / Towns
| Cambridge Village (1,457) | Fort Atkinson City (12,368) | Hebron (224) |
| Helenville (249) | Ixonia (1,624) | Jefferson City (7,973) |
| Johnson Creek Village (2,738) | Lac La Belle Village (290) | Lake Koshkonong (1,204) |
| Lake Mills City (5,708) | Lake Ripley (1,779) | Palmyra Village (1,781) |
| Rome (689) | Sullivan Village (669) | Waterloo City (3,333) |
| Watertown City (23,861) | Whitewater City (14,390) |
Jefferson County Zip Codes
| 53036 (2,720) | 53038 (4,013) | 53066 (33,830) |
| 53094 (19,169) | 53118 (7,202) | 53137 (1,702) |
| 53156 (2,992) | 53178 (2,626) | 53190 (19,200) |
| 53523 (4,949) | 53534 (11,512) | 53538 (18,468) |
| 53549 (10,414) | 53551 (8,273) | 53559 (6,063) |
| 53563 (10,728) | 53594 (5,144) |