Jefferson County
Jefferson County is located in the eastern portion of the U.S. state of Missouri. It is a part of the St. Louis Metropolitan Area. As of the 2020 census, the population was 226,739, making it the sixth-most populous county in Missouri. Its county seat is Hillsboro. The county was organized in 1818 and named in honor of former president Thomas Jefferson. In 1980, according to the U.S. census held that year, the county contained the mean center of U.S. population. Notably, this was the first census in which the center of population was west of the Mississippi River. Jefferson County is part of the St. Louis Metropolitan Statistical Area and encompasses many of the city's southern suburbs.
Governance bodies
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Cities and towns 15
- City of Arnold pop. 20,819
- City of Byrnes Mill pop. 3,166
- City of Crystal City pop. 4,720
- City of De Soto pop. 6,435
- City of Festus pop. 12,874
- City of Herculaneum pop. 4,912
- City of Hillsboro pop. 3,497
- City of Kimmswick pop. 131
- City of Olympian Village pop. 715
- City of Pevely pop. 6,016
- Town of Scotsdale pop. 195
- Village of Cedar Hill Lakes pop. 203
- Village of Lake Tekakwitha pop. 231
- Village of Parkdale pop. 156
- Village of Peaceful pop. 94
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 107559
- FIPS state
- 29
- FIPS county
- 099
- FIPS place
- 99099
- Census record name
- COUNTY OF JEFFERSON
- Mailing address
- PO BOX 100, HILLSBORO 63050