Cost of Living in O'Fallon, IL
Population 32,139 · Illinois · Data vintage 2023
(100 = US avg)
Most of O'Fallon's cost indicators track within a reasonable band of national figures, with median household incomes near $102,793 — a more representative starting point for relocation math than the headline-expensive or headline-cheap cities on either tail.
Geographically, O'Fallon sits roughly 20 miles east of St. Louis. Median home values run roughly 48% higher than St. Louis' $185,000.
Cost Overview
Scale: 100 = US national average. Green < 90, Red > 110.
About the Cost of Living in O'Fallon
The median home value in O'Fallon is $274,100 — 10% below the national median of $305,000. Median rent runs $1,312/month, equal to than the national median of $1,314/month. The median household income of $102,793/year is 38% higher than the US median of $74,580. The local unemployment rate is 3.3%, below the national average of 4.8%. Illinois's top state income tax rate is 5.0% and the combined sales tax is 8.7%. Overall, O'Fallon has a cost of living index of 94 versus the US average of 100, meaning it is 6% less expensive.
🏠 Housing
HUD Fair Market Rents by Bedroom
💰 Estimated Monthly Budget
Estimates based on median data and national averages. Actual costs vary.
🛒 Food & Groceries
National BLS average prices (2023). Local prices may vary.
🚗 Transportation
Commute Mode
⚡ Utilities
📋 Taxes
💼 Income & Employment
🎓 Education
👥 Demographics
Frequently Asked Questions
What is the cost of living in O'Fallon, IL?
O'Fallon has a cost index of 94 (100 = national average). It is 6% below the national average.
What is average rent in O'Fallon, IL?
The median gross rent in O'Fallon is $1,312 per month based on 2023 Census data.
What is the average home price in O'Fallon?
The median home value in O'Fallon is $274,100 according to 2023 Census ACS data.
What is the median income in O'Fallon?
The median household income in O'Fallon is $102,793 per year (2023 ACS 5-year estimates).
What is the sales tax in O'Fallon, IL?
The combined state and local sales tax rate in O'Fallon is 8.7%. The Illinois state income tax top rate is 5.0%.
Is O'Fallon, IL affordable?
O'Fallon is near the national average in terms of cost of living, with an index of 94 (100 = US average).
O'Fallon at a Glance
- Population
- 32,139
- Median Income
- $102,793
- Home Value
- $274,100
- Median Rent
- $1,312/mo
- Unemployment
- 3.3%
- Sales Tax
- 8.7%
Explore county-level cost of living data
Illinois Rankings
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