Jefferson County is a district of Illinois.
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 Bald Hill | no seat recorded | |
| Township of Blissville | no seat recorded | |
| Township of Casner | no seat recorded | |
| Township of Dodds | no seat recorded | |
| Township of Elk Prairie | no seat recorded | |
| Township of Farrington | no seat recorded | |
| Township of Field | no seat recorded | |
| Township of Grand Prairie | no seat recorded | |
| Township of McClellan | no seat recorded | |
| Township of Moores Prairie | no seat recorded | |
| Township of Mount Vernon | Mount Vernon | |
| Township of Pendleton | no seat recorded | |
| Township of Rome | no seat recorded | |
| Township of Shiloh | no seat recorded | |
| Township of Spring Garden | no seat recorded | |
| Township of Webber | 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 Mount Vernon 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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