Cost of Living in O'Fallon, IL
Overall index: 97 (100 = US national average). Data source: US Census ACS 2023 & BLS OEWS 2025, 2025.
Overall Cost of Living Index
Cost Breakdown by Category
| Category | Index | vs US avg | Sample cost |
|---|---|---|---|
| Housing | 79 | -21% | $918 |
| Transportation | 99 | -1% | $3.50 |
| Food | 138 | +38% | $566 |
| Utilities | 90 | -10% | $142 |
| Healthcare | 90 | -10% | $103 |
Index 100 = US national average. Higher = more expensive.
Cost breakdown (visual)
Salary Calculator: What do you need to earn in O'Fallon?
A single adult living comfortably in O'Fallon, IL needs approximately $33,950 / year after taxes.
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Frequently Asked Questions
What is the cost of living in O'Fallon, IL?
The overall cost of living in O'Fallon, IL is 3% lower than the US national average (index: 97 where 100 = national average).
How much is rent in O'Fallon, IL?
Average rent for a 1-bedroom apartment in O'Fallon, IL is about $918/month.
Is O'Fallon, IL expensive to live in?
Costs in O'Fallon, IL are roughly in line with the national average.
What salary do I need to live in O'Fallon, IL?
A single adult needs roughly $33,950/year to cover basic living costs in O'Fallon, IL.