Map of Shelby County, Illinois

Shelby County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 20,990. Its county seat is Shelbyville.

Shelby County overview:
Name:	Shelby County
FIPS code:	17-173
State:	Illinois
Founded:	1827
Named for:	Isaac Shelby
Seat:	Shelbyville
Largest city:	Shelbyville
Total Area:	768 sq mi (1,990 km²)
Land Area:	759 sq mi (1,970 km²)
Total Population:	20,990
Population Density:	27/sq mi (11/km²)
Time zone:	UTC−6 (Central)
Summer Time Zone (DST):	UTC−5 (CDT)
Website:	www.shelbycounty-il.com

Shelby County location map. Where is Shelby County?

Shelby County location on the U.S. Map. Where is Shelby County. — Location of Shelby County in the the United States.

Shelby County location on the Illinois map. Where is Shelby County. — Location of Shelby County in Illinois.

History

Shelby County was established in 1827 out of Fayette County. It was named in honor of Isaac Shelby, governor of Kentucky and participant in the American Revolutionary War.

Shelby county from the time of its creation to 1829, including a large tract of unorganized territory temporarily attached to it, whose precise border was not defined.
Shelby County between 1829 and 1839
Shelby County between 1839 and 1843
Shelby County in 1843, reduced to its present borders

Shelby County Road Map

Shelby CountyStreet Map. — Street map of Shelby County, Illinois. Source: OpenStreetMap (OSM)

Shelby CountyMap — Shelby Countypolitical map.

Geography

According to the U.S. Census Bureau, the county has a total area of 768 square miles (1,990 km), of which 759 square miles (1,970 km) is land and 9.5 square miles (25 km) (1.2%) is water.

Climate and weather

In recent years, average temperatures in the county seat of Shelbyville have ranged from a low of 19 °F (−7 °C) in January to a high of 87 °F (31 °C) in July, although a record low of −26 °F (−32 °C) was recorded in January 1915 and a record high of 111 °F (44 °C) was recorded in July 1936. Average monthly precipitation ranged from 1.89 inches (48 mm) in February to 4.05 inches (103 mm) in June.