What is the cost of living in O'Fallon, IL?
According to the most recent data on the cost of living, O'Fallon has an overall cost of living index of 107, which is 1.1x higher than the national index of 100.
Compared to Illinois, O'Fallon has a cost of living index that's 1.1x higher than Illinois's index of 98.
The standard of living in O'Fallon ranks as #203 most affordable out of the 336 places we measured in Illinois. By definition, that implies O'Fallon ranks as the #133 most expensive place in the Prairie State.
For more reading on life in O'Fallon, check out:
O'Fallon Cost Of Living Vs. Illinois
Six factors go into calculating the cost of living index in O'Fallon. Here is how it fares on each of the criteria:
The Services index in O'Fallon is 102.
The Groceries index in O'Fallon is 99.
The Health index in O'Fallon is 120.
The Housing index in O'Fallon is 99.
The Transportation index in O'Fallon is 103.
The Utilities index in O'Fallon is 98.
| Living Expense | O'Fallon | Illinois | National Average |
|---|---|---|---|
| Overall | 107 | 98 | 100 |
| Services | 102 | 99 | 100 |
| Groceries | 99 | 99 | 100 |
| Health | 120 | 96 | 100 |
| Housing | 99 | 101 | 100 |
| Transportation | 103 | 99 | 100 |
| Utilities | 98 | 101 | 100 |
O'Fallon Cost Of Living Compared To Illinois Averages
Index where 100 = national average. Source: cost-of-living index 2026.
For more reading on cost of living around Illinois, check out:
Protect your home budget Compare home warranties in O'Fallon Get matched →Source: Cost-of-living index 2026, normalized to US average = 100
O'Fallon, IL Housing Cost Breakdown
Housing swings affordability the most between places in Illinois, so we broke down housing costs into more detail. Home and income data comes from the most recent US Census ACS 2020-2024. The key points are:
The Median Home Value in O'Fallon is $308,470.
The Median Rent in O'Fallon is $1,332.
The Median Income in O'Fallon is $105,982.
The Home Value To Income in O'Fallon is 2.9x.
The Rent To Monthly Income in O'Fallon is 0.15x.
O'Fallon, IL Costs By Category
Detailed O'Fallon Services costs vs. Illinois
Detailed O'Fallon Groceries costs vs. Illinois
Detailed O'Fallon Health costs vs. Illinois
Detailed O'Fallon Transportation costs vs. Illinois
O'fallon SnackAbility
Cost Of Living In Cities Around O'Fallon
The cost of living varies in the cities and towns around O'Fallon. Here's a quick look at the cost of living in the most populous nearby places:
Belleville, IL has a cost of living index of 88, 0.8x O'Fallon.
Edwardsville, IL has a cost of living index of 104, 1.0x O'Fallon.
Collinsville, IL has a cost of living index of 91, 0.9x O'Fallon.
| City | Population | Cost Of Living | Vs. O'Fallon |
|---|---|---|---|
| Belleville, IL | 41,370 | 88 | 0.8x |
| Edwardsville, IL | 26,474 | 104 | 1.0x |
| Collinsville, IL | 24,031 | 91 | 0.9x |
| Fairview Heights, IL | 16,745 | 95 | 0.9x |
| Swansea, IL | 14,710 | 100 | 0.9x |
| Shiloh, IL | 14,572 | 104 | 1.0x |
| Glen Carbon, IL | 13,977 | 106 | 1.0x |
| Troy, IL | 11,647 | 102 | 1.0x |
| Columbia, IL | 11,127 | 103 | 1.0x |
| Highland, IL | 10,262 | 96 | 0.9x |
