Communities in Jefferson County Missouri

Mastodon State Historic Site in Jefferson County

Jefferson County Missouri is located south of St. Louis County with the Meramec River being part of the boundary between the two counties. Ste. Genevieve and St. Francois counties lie to the south and Franklin and Washington counties lie to the west. Jefferson County was formed in 1818 along with much of the other surrounding counties. It covers 664 square miles and has 15 large communities within its boundaries. In 2010, the US Census put the population of Jefferson County at 218,733. The county seat is located in the city of Hillsboro.

Below is a list of the communities in Jefferson County. Click on any of the links to find that community's specific government information such as the address to the city hall, phone numbers of the mayor, city clerk, police department and other information.

Arnold Missouri
Arnold Missouri - The City of Arnold Missouri is located in Jefferson County, just south and west of the curve in the Meramec River and is in the 63010 zip code. - More Info Tags: 63010, Arnold Missouri
Barnhart Missouri
Barnhart Missouri - Barnhart Missouri is a Census Designated Place (CDP) and is located in Jefferson County in the 63012 zip code and is about 30 minutes south of Downtown St. Louis along Interstate 55. - More Info Tags: 63012, Barnhart Missouri
Byrnes Mill Missouri
Byrnes Mill Missouri - Brynes Mill Missouri is located in Jefferson County and is about 45 minutes southwest of Downtown St. Louis along Highway 30 in the 63051 zip code. - More Info Tags: 63051, Byrnes Mill Missouri
Cedar Hill Missouri
Cedar Hill Missouri - Cedar Hill Missouri is a census-designated place located in Jefferson County. The community lies southwest of House Springs Missouri just off of Highway 30 in the 63016 zip code. - More Info Tags: 63016, Cedar Hill Missouri
Crystal City Missouri
Crystal City Missouri - The City of Crystal City Missouri is located in Jefferson County. The city lies along the Mississippi River and is located about 45 minutes south of Downtown St Louis in the 63019 zip code. - More Info Tags: 63019, Crystal City Missouri
De Soto Missouri
De Soto Missouri - The City of De Soto Missouri is located in Jefferson County and is about 45 miles south of Downtown St Louis in the 63020 zip code. - More Info Tags: 63020, De Soto Missouri
Dittmer Missouri
Dittmer Missouri - Dittmer Missouri is an unincorporated area in Jefferson County Missouri, located southwest of the community of Cedar Hill and just off of Highway 30. - More Info Tags: 63023, Dittmer Missouri
Festus Missouri
Festus Missouri - The City of Festus is located in Jefferson County about 45 minutes south of Downtown St. Louis along Interstate 55 in the 63028 zip code. - More Info Tags: 63028, Festus Missouri
Herculaneum Missouri
Herculaneum Missouri - The City of Herculaneum Missouri, the birthplace of Missouri's 18th Governor, is located in Jefferson County in the 63048 zip code. - More Info Tags: 63048, Herculaneum Missouri
High Ridge Missouri
High Ridge Missouri - High Ridge Missouri is located in Jefferson County and is a Census-Designated Place in the 63049 zip code. - More Info Tags: 63049, High Ridge Missouri
Hillsboro Missouri
Hillsboro Missouri - The City of Hillsboro Missouri is located in Jefferson County in the 63050 zip code and is near the Sandy Creek Bridge State Historic Site. - More Info Tags: 63050, Hillsboro Missouri
House Springs Missouri
House Springs Missouri - House Springs is an unincorporated area located in Jefferson County Missouri in the 63051 zip code. - More Info Tags: 63051, House Springs Missouri
Imperial Missouri
Imperial Missouri - Imperial Missouri is a Census-Designated Place (CDP) and is located in Jefferson County in the 63052 zip code. The Mastodon State Historic Site is found in Imperial. - More Info Tags: 63052, Imperial Missouri
Kimmswick Missouri
Kimmswick Missouri - The quaint historic town of Kimmswick is located in Jefferson County, just about 35 minutes south of Downtown St Louis along Interstate 55. - More Info Tags: 63052, Kimmswick Missouri
Pevely Missouri
Pevely Missouri - The City of Pevely Missouri is located in Jefferson County, about 40 minutes south of Downtown St Louis via Interstate 55. - More Info Tags: 63070, Pevely Missouri

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