Map of Richland County, Illinois

Richland County is a county located in the U.S. state of Illinois. According to the 2020 United States census, it had a population of 15,813. Its county seat is Olney.

Richland County overview:
Name:	Richland County
FIPS code:	17-159
State:	Illinois
Founded:	February 24, 1841
Named for:	Richland County, Ohio
Seat:	Olney
Largest city:	Olney
Total Area:	362 sq mi (940 km²)
Land Area:	356 sq mi (920 km²)
Total Population:	15,813
Population Density:	44/sq mi (17/km²)
Time zone:	UTC−6 (Central)
Summer Time Zone (DST):	UTC−5 (CDT)

Richland County location map. Where is Richland County?

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

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

History

Richland County was established in 1841 out of portions of East part of Clay and West part of Lawrence counties. It was named for Richland County, Ohio, where many of the early settlers migrated from.

Richland County at the time of its creation in 1841

Richland County Road Map

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

Richland CountyMap — Richland Countypolitical map.

Geography

According to the U.S. Census Bureau, the county has a total area of 362 square miles (940 km), of which 360 square miles (930 km) is land and 1.9 square miles (4.9 km) (0.5%) is water.

Climate and weather

In recent years, average temperatures in the county seat of Olney have ranged from a low of 19 °F (−7 °C) in January to a high of 88 °F (31 °C) in July, although a record low of −25 °F (−32 °C) was recorded in February 1951 and a record high of 112 °F (44 °C) was recorded in July 1936. Average monthly precipitation ranged from 2.73 inches (69 mm) in February to 4.76 inches (121 mm) in May.