Jefferson County is a district of Wisconsin.
Boundaries: United States Census Bureau, MAF/TIGER Database (https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html) via geoBoundaries, public domain
| City of Fort Atkinson | no seat recorded | 12 k |
| City of Jefferson | Jefferson | 8 k |
| City of Lake Mills | no seat recorded | 6 k |
| City of Waterloo | no seat recorded | 3 k |
| City of Watertown | no seat recorded | 24 k |
| Town of Aztalan | no seat recorded | 1 k |
| Town of Cold Spring | no seat recorded | 743 |
| Town of Concord | no seat recorded | 2 k |
| Town of Farmington | no seat recorded | 1 k |
| Town of Hebron | no seat recorded | 1 k |
| Town of Ixonia | no seat recorded | 4 k |
| Town of Jefferson | no seat recorded | 2 k |
| Town of Koshkonong | no seat recorded | 4 k |
| Town of Lake Mills | no seat recorded | 2 k |
| Town of Milford | no seat recorded | 1 k |
| Town of Oakland | no seat recorded | 3 k |
| Town of Palmyra | no seat recorded | 1 k |
| Town of Sullivan | no seat recorded | 2 k |
| Town of Sumner | no seat recorded | 849 |
| Town of Waterloo | no seat recorded | 928 |
| Town of Watertown | no seat recorded | 2 k |
| Village of Johnson Creek | no seat recorded | 3 k |
| Village of Palmyra | no seat recorded | 2 k |
| Village of Sullivan | no seat recorded | 669 |
Nothing has been written about Jefferson County here, and neither Wikipedia nor Wikivoyage has an article we could draw one from. If you know the place, that makes you a better source than anything we have. Tell us what is worth knowing and where you got it.
We show Jefferson as the capital of Jefferson County. If that is wrong, tell us what it should be and where you read it.
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