Map of Johnson County, Illinois

Johnson County is a county in the U.S. state of Illinois. According to the 2010 census, it has a population of 12,582. Its county seat is Vienna. It is located in the southern portion of Illinois known locally as “Little Egypt”.

Johnson County overview:
Name:Johnson County
FIPS code:17-087
State:Illinois
Founded:1812
Named for:Richard Mentor Johnson
Seat:Vienna
Largest city:Vienna
Total Area:349 sq mi (900 km²)
Land Area:344 sq mi (890 km²)
Total Population:13,308
Population Density:38/sq mi (15/km²)
Time zone:UTC−6 (Central)
Summer Time Zone (DST):UTC−5 (CDT)

Johnson County location map. Where is Johnson County?

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

History

Johnson County was organized in 1812 out of Randolph County. It was named for Richard Mentor Johnson, who was then a U.S. Congressman from Kentucky. In 1813, Johnson commanded a Kentucky regiment at the Battle of the Thames, after which he claimed to have killed Tecumseh in hand-to-hand combat. Johnson went on to become Vice President of the United States.

Johnson County Road Map

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

Geography

According to the U.S. Census Bureau, the county has a total area of 349 square miles (900 km), of which 344 square miles (890 km) is land and 4.9 square miles (13 km) (1.4%) is water.

Climate and weather

In recent years, average temperatures in the county seat of Vienna have ranged from a low of 25 °F (−4 °C) in January to a high of 90 °F (32 °C) in July, although a record low of −20 °F (−29 °C) was recorded in January 1977 and a record high of 103 °F (39 °C) was recorded in August 2007. Average monthly precipitation ranged from 3.16 inches (80 mm) in October to 5.16 inches (131 mm) in May.

Major highways

  • Interstate 24
  • Interstate 57
  • U.S. Route 45
  • Illinois Route 37
  • Illinois Route 146
  • Illinois Route 147
  • Illinois Route 166

Transit

  • List of intercity bus stops in Illinois

Adjacent counties

National protected areas

  • Cypress Creek National Wildlife Refuge (part)
  • Shawnee National Forest (part)

Johnson County Topographic Map

Topographic Map of Johnson County, Illinois
Johnson County Topo map.

Johnson County Satellite Map

Satellite Map of Johnson County, Illinois
Johnson County satellite map.

Johnson County Outline Map

Outline Map of Johnson County, Illinois
Johnson County outline map.
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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
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Illinois (/ˌɪlɪˈnɔɪ/ (listen) IL-ə-NOY) is a state in the Midwestern United States. It shares borders with Wisconsin to its north, Iowa to its northwest, Missouri to its southwest, Kentucky to its south, and Indiana to its east. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. ... Read more
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