Jefferson County Map, Missouri

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Jefferson County, Missouri

Jefferson County is just south of St. Louis. The Mississippi River forms its eastern border, separating it from the state of Illinois. Old towns, new subdivisions. It’s all here.
This place has been around since 1818, and it shows in the best ways. People love exploring the area’s past, from Native American sites to Civil War battlefields.
Did someone say fishing? Oh yeah. The Big River’s a hotspot and several of its lakes. De Soto might be the biggest town, but don’t sleep on the smaller spots.
Category | Details |
---|---|
County Name | Jefferson County |
County Seat | Hillsboro |
Population | Approximately 230,000 |
Cities, Towns, and Communities | Arnold, Festus, De Soto, Pevely, Hillsboro, Crystal City, Byrnes Mill, Herculaneum |
Interstates and Highways | I-55, US 61, MO 21, MO 30, MO 141 |
FIPS Code | 29-099 |
Total Area (Land and Water) | 664 square miles (Land: 657 sq mi, Water: 7 sq mi) |
Adjacent Counties (and Direction) | St. Louis County (North), Monroe County, Illinois (East), Ste. Genevieve County (Southeast), St. Francois County (South), Washington County (Southwest), Franklin County (West) |
Time Zone | Central Time Zone (CT) |
State | Missouri |
Coordinates | 38.2157° N, 90.5258° W |
Etymology | Named after Thomas Jefferson, the third President of the United States |
Major Landmarks | Mastodon State Historic Site, Sandy Creek Covered Bridge, Jefferson Barracks Historic Park |
Website | Jefferson County Website |
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