These are the 10 richest counties in Illinois, analysis finds. How St. Clair County fared

Lindsay Smith
·2 min read
1

With a median income of $63,017, St. Clair County is the 28th wealthiest county in Illinois, according to a recent analysis from tech company SmartAsset.

Measuring median income, investment income and median home value of each county, SmartAsset ranked all U.S. counties on wealth. The company used data from the U.S. Census Bureau, the Internal Revenue Service and popular real estate site Zillow for the report.

St. Clair County’s median income is about $9,500 less than the statewide figure, which is $72,563. The county’s investment income, meanwhile, is about the same as the statewide number, at $21,989 to Illinois’ $21,770.

According to the U.S. Census Bureau, 13.3% of St. Clair County’s population lives in poverty.

With a median income exceeding $100,000, DuPage County is the richest county in Illinois, SmartAsset reports. Just one metro-east county, Monroe, made the top 10 list.

Here’s a closer look at the 10 wealthiest counties in the state.

Wealthiest counties in Illinois

No. 1: DuPage County

  • Median income: $100,292

  • Investment income: $47,000

  • Median home value: $359,501

No. 2: Lake County

  • Median income: $97,127

  • Investment income: $84,289

  • Median home value: $320,341

No. 3: Kendall County

  • Median income: $101,816

  • Investment income: $13,829

  • Median home value: $321,161

No. 4: Will County

  • Median income: $95,751

  • Investment income: $22,116

  • Median home value: $306,049

No. 5: Kane County

  • Median income: $88,935

  • Investment income: $29,424

  • Median home value: $316,163

No. 6: Cook County

  • Median income: $72,121

  • Investment income: $80,782

  • Median home value: $284,464

No. 7: McHenry County

  • Median income: $93,801

  • Investment income: $25,563

  • Median home value: $299,253

No. 8: Monroe County

  • Median income: $92,950

  • Investment income: $19,321

  • Median home value: $257,961

No. 9: Grundy County

  • Median income: $81,764

  • Investment income: $20,765

  • Median home value: $265,309

No. 10: DeKalb County

  • Median income: $64,019

  • Investment income: $23,231

  • Median home value: $228,999

How does Illinois stack up nationally?

DuPage County, while the wealthiest in Illinois, ranked 171st nationally. Lake County came in at the 262nd spot. St. Clair ranked 1,477th among the richest counties in the U.S.

Four California counties and one in Massachusetts made up the top five, while counties in New York, Wyoming and Virginia all made it into the top 10.

With a median income of $136,837, San Mateo County in California took first place as the richest U.S. county.