Jefferson County is a district of Missouri.
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
| Township of Arnold | no seat recorded | |
| Township of Big River | no seat recorded | |
| Township of Central | Hillsboro | |
| Township of High Ridge | no seat recorded | |
| Township of Imperial | no seat recorded | |
| Township of Joachim | no seat recorded | |
| Township of Meramec | no seat recorded | |
| Township of Plattin | no seat recorded | |
| Township of River View | no seat recorded | |
| Township of Rock | no seat recorded | |
| Township of Valle | no seat recorded | |
| Township of Windsor | 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 Hillsboro 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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