Jefferson County is a district of Iowa.
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 Fairfield | Fairfield | 9 k |
| Township of Black Hawk | no seat recorded | |
| Township of Buchanan | no seat recorded | |
| Township of Cedar | no seat recorded | |
| Township of Center | no seat recorded | |
| Township of Des Moines | no seat recorded | |
| Township of Liberty | no seat recorded | |
| Township of Lockridge | no seat recorded | |
| Township of Locust Grove | no seat recorded | |
| Township of Penn | no seat recorded | |
| Township of Polk | no seat recorded | |
| Township of Round Prairie | no seat recorded | |
| Township of Walnut | no seat recorded |
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 Fairfield 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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