Cost of Living in O'Fallon, IL
Cost indexes, living wages, and fair market rents — 2024 Data
Cost of Living Overview
Overall Index
147.1
100 = national avg
+47.1 vs national average
Living Wage (1 Adult)
$64,744
per year
Living Wage (Family of 4)
$153,032
per year
Cost Index by Category
Housing158.7
Food128.6
Transportation157.1
Healthcare122.9
Utilities128.9
100 = national average. Higher = more expensive.
Fair Market Rent
Source: HUD1 Bedroom
$995
per month
2 Bedroom
$1,218
per month
The overall cost of living index in O'Fallon is 147.1, which is 47.1% above the national average. Housing costs are above the national average at an index of 158.7. A single adult needs to earn approximately $64,744 per year to cover basic expenses.