Missouri County Maps
Find Missouri county and township maps.
Jefferson County, Missouri
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Jefferson County, Missouri Map
An detailed map of Jefferson County. Click on a nearby County to view more information about that County.
Map of Townships in Jefferson County, Missouri
An interactive map of county subdivisions in Jefferson County. In Missouri, that can include Townships. Find what township you are in now.
Map of Counties in Missouri
An interactive map of Counties in Missouri. Click on a County to view more information about that County.
About Jefferson County, Missouri
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.
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This site has an interactive map of Missouri Counties. Click on the map to find your Missouri county, and view more details. You can also search for your address and use your GPS to find your Missouri County.
Find what County you are in, and see official Missouri County resources and information. Find any county in the United Stated, along with resources and links to official County websites. See a County map and local details. Looking for what county you are currently in? Find out on this map or use your device GPS to see what county you are in.