Map of Jefferson County, Missouri

Jefferson County is located in the eastern portion of the 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.

Jefferson County overview:
Name:Jefferson County
FIPS code:29-099
State:Missouri
Founded:1818
Named for:Thomas Jefferson
Seat:Hillsboro
Largest city:Arnold
Total Area:664 sq mi (1,720 km²)
Land Area:657 sq mi (1,700 km²)
Total Population:226,739
Population Density:340/sq mi (130/km²)
Time zone:UTC−6 (Central)
Summer Time Zone (DST):UTC−5 (CDT)
Website:www.jeffcomo.org

Jefferson County location map. Where is Jefferson County?

Jefferson County location on the U.S. Map. Where is Jefferson County.
Location of Jefferson County in the the United States.
Jefferson County location on the Missouri map. Where is Jefferson County.
Location of Jefferson County in Missouri.

Jefferson County Road Map

Jefferson CountyStreet Map.
Street map of Jefferson County, Missouri. Source: OpenStreetMap (OSM)
Jefferson CountyMap
Jefferson Countypolitical map.

Geography

According to the U.S. Census Bureau, the county has a total area of 664 square miles (1,720 km), of which 657 square miles (1,700 km) is land and 7.7 square miles (20 km) (1.2%) is water. The county’s eastern border is the Mississippi River.

Adjacent counties

Major highways

  • Interstate 55
  • U.S. Route 61
  • U.S. Route 67
  • Route 21
  • Route 30
  • Route 109
  • Route 110
  • Route 141
  • Route 231

National protected area

  • Middle Mississippi River National Wildlife Refuge (part)

Jefferson County Topographic Map

Topographic Map of Jefferson County, Missouri
Jefferson County Topo map.

Jefferson County Satellite Map

Satellite Map of Jefferson County, Missouri
Jefferson County satellite map.

Jefferson County Outline Map

Outline Map of Jefferson County, Missouri
Jefferson County outline map.
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Parent Unit Map

Map of United States
The United States (US) covers a total area of 9,833,520 sq. km. Of this area, the 48 contiguous states and the District of Columbia cover 8,080,470 sq. km. The archipelago of Hawaii has an area of 28,311 sq. km while the remaining area is part of the US territories. The greatest east-west distance in the ... Read more
Map of United States
Political map of Missouri State – Printable Collection
Missouri is a state in the Midwestern region of the United States. Ranking 21st in land area, it is bordered by eight states (tied for the most with Tennessee): Iowa to the north, Illinois, Kentucky and Tennessee to the east, Arkansas to the south and Oklahoma, Kansas and Nebraska to the west. In the south ... Read more
Political map of Missouri State – Printable Collection

Related Administrative Divisions

Sub-Administrative Units Maps