Jefferson County
Jefferson County is a county located in the southern part of the U.S. state of Illinois. According to the 2020 census, it has a population of 37,113. The county seat is Mount Vernon. Jefferson County contains the Mount Vernon, Illinois micropolitan area. It is located in the southern portion known locally as "Little Egypt". The western border of the county adjoins the Greater St. Louis consolidated metropolitan statistical area, the Metro-East region, and the St. Louis commuter region and market and viewing area.
Governance bodies
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Cities and towns 9
Townships 16
- Township of Bald Hill pop. 792
- Township of Blissville pop. 373
- Township of Casner pop. 1,157
- Township of Dodds pop. 2,693
- Township of Elk Prairie pop. 683
- Township of Farrington pop. 567
- Township of Field pop. 1,490
- Township of Grand Prairie pop. 893
- Township of Mcclellan pop. 1,205
- Township of Moores Prairie pop. 356
- Township of Mount Vernon pop. 12,397
- Township of Pendleton pop. 1,141
- Township of Rome pop. 1,642
- Township of Shiloh pop. 6,556
- Township of Spring Garden pop. 2,811
- Township of Webber pop. 2,121
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 124843
- FIPS state
- 17
- FIPS county
- 081
- FIPS place
- 99081
- Census record name
- COUNTY OF JEFFERSON
- Mailing address
- 100 S 10TH ST, MOUNT VERNON 62864