O'Fallon is 5% cheaper than the national average with a median income of $102,793 and a population of 32,139.
Best Places to Live in Illinois (2026)
Illinois has a cost of living index of 80 (US average = 100) with a median household income of $75,153 and a population of 11,229,592. We ranked 15 cities based on affordability, income, housing value, and climate to find the best places to call home in Illinois.
New Lenox is 5% more expensive than the national average with a median income of $133,071 and a population of 27,456.
Manhattan is 1% cheaper than the national average with a median income of $128,375 and a population of 10,315.
Godfrey is 18% cheaper than the national average with a median income of $92,746 and a population of 17,743.
Pingree Grove is 3% cheaper than the national average with a median income of $119,880 and a population of 10,576.
Shiloh is 11% cheaper than the national average with a median income of $100,058 and a population of 14,109.
Wauconda is 3% cheaper than the national average with a median income of $112,438 and a population of 14,010.
Troy is 15% cheaper than the national average with a median income of $97,825 and a population of 10,889.
South Elgin is 9% more expensive than the national average with a median income of $123,744 and a population of 23,984.
Edwardsville is 6% cheaper than the national average with a median income of $92,671 and a population of 26,543.
Grayslake is 3% more expensive than the national average with a median income of $113,697 and a population of 20,707.
Round Lake is 2% more expensive than the national average with a median income of $108,965 and a population of 18,588.
Joliet is 6% cheaper than the national average with a median income of $88,026 and a population of 149,785.
Mokena is 9% more expensive than the national average with a median income of $129,017 and a population of 19,906.
Waterloo is 21% cheaper than the national average with a median income of $92,005 and a population of 11,055.
How We Rank the Best Places to Live
Our livability score combines four data-driven factors: affordability (35% — cost of living index relative to national average), income (25% — median household income from the Census Bureau), housing value (15% — home price to income ratio), and climate (15% — NOAA temperature normals favoring moderate climates). Population serves as a proxy for amenities (10%).
Only cities with at least 5,000–10,000 residents are included. Data sourced from the US Census Bureau, Zillow, HUD, and NOAA.