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Jefferson County Map, Missouri

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Jefferson County, Missouri

Jefferson Location Map 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.

CategoryDetails
County NameJefferson County
County SeatHillsboro
PopulationApproximately 230,000
Cities, Towns, and CommunitiesArnold, Festus, De Soto, Pevely, Hillsboro, Crystal City, Byrnes Mill, Herculaneum
Interstates and HighwaysI-55, US 61, MO 21, MO 30, MO 141
FIPS Code29-099
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 ZoneCentral Time Zone (CT)
StateMissouri
Coordinates38.2157° N, 90.5258° W
EtymologyNamed after Thomas Jefferson, the third President of the United States
Major LandmarksMastodon State Historic Site, Sandy Creek Covered Bridge, Jefferson Barracks Historic Park
WebsiteJefferson County Website

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