Where is Jefferson County, Illinois?

location of Jefferson county on a map — Location of Jefferson County within the state of Illinois

Jefferson County is a county equivalent area found in Illinois, USA. The county government of Jefferson is found in the county seat of Mount Vernon.

With a total 1,511.99 sq. km of land and water area, Jefferson County, Illinois is the 1809th largest county equivalent area in the United States. Home to 38,534 people, Jefferson County has a total 16757 households earning 42981 on average per year.

Jefferson County, Illinois - Quick Facts

FIPS Code	17081
Area Codes	618
Time Zone	CST
Major Cities	Mount Vernon (population: 24,041), Ina (population: 2,623), Bluford (population: 2,115), Woodlawn (population: 2,091), Dix (population: 1,387), Bonnie (population: 1,302), Opdyke (population: 1,174), Belle Rive (population: 1,085), Waltonville (population: 1,003), Texico (population: 846)
Land Area	14,878 sq miles
Water Area	571 sq miles
Household Income	$42,981
Housing Units	16,757
Median Home Value	$86,300
High School Grads	87% of population
Holders of Bachelors Degrees	16% of population
Retail Spending	$14,157 per capita
Food & Accomodation Sales	$67,783 per capita
Universities and Colleges	Rend Lake College