Cost of Living in O'Fallon, MO
Overall index: 102 (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 | 88 | -12% | $980 |
| Transportation | 98 | -2% | $3.50 |
| Food | 144 | +44% | $590 |
| Utilities | 94 | -6% | $158 |
| Healthcare | 94 | -6% | $114 |
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, MO needs approximately $35,700 / year after taxes.
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Frequently Asked Questions
What is the cost of living in O'Fallon, MO?
The overall cost of living in O'Fallon, MO is 2% higher than the US national average (index: 102 where 100 = national average).
How much is rent in O'Fallon, MO?
Average rent for a 1-bedroom apartment in O'Fallon, MO is about $980/month.
Is O'Fallon, MO expensive to live in?
Costs in O'Fallon, MO are roughly in line with the national average.
What salary do I need to live in O'Fallon, MO?
A single adult needs roughly $35,700/year to cover basic living costs in O'Fallon, MO.