O'Fallon, IL

Average · 96

Illinois · Population 32,139 · Updated March 2026

$1,312
Median Rent / Month
$102,793
Median Income
$274,100
Median Home Value
$1,595
Owner Costs / Month

Affordability

How far your income goes in O'Fallon

15.3%
Rent-to-Income Ratio
Affordable
Rent takes less than 25% of median income — considered affordable by HUD standards.

Tax Burden in Illinois

State-level tax rates that affect your costs

4.95%
Income Tax (Top Rate)
6.25%
Sales Tax
2.07%
Property Tax Rate

Estimated Annual Costs

$15,744
Annual Rent
$5,088
State Income Tax
$5,674
Property Tax (est.)

Cost of Living Overview

O'Fallon has a cost of living close to the national average, offering a balanced mix of expenses and amenities. With a cost index of 96 (where 100 equals the national median), O'Fallon residents can expect to pay median rent of $1,312/month while earning a median household income of $102,793/year.

The median home value in O'Fallon, IL is $274,100, with typical monthly owner costs around $1,595 including mortgage, insurance, and taxes. The median rent-to-income ratio of 15.3% means housing is relatively affordable here — well below the 30% threshold that HUD considers cost-burdened.

Illinois has a moderate income tax rate of 4.95%. Combined with a 6.25% sales tax rate and 2.07% effective property tax rate, the overall tax environment is a factor in the total cost of living in O'Fallon.

Frequently Asked Questions

Common questions about living costs in O'Fallon

What is the cost of living in O'Fallon, IL?
The cost of living index in O'Fallon, IL is 96 (US average = 100). Median monthly rent is $1,312, median household income is $102,793/year, and the median home value is $274,100.
Is O'Fallon, IL affordable?
Yes, O'Fallon is more affordable than the national average with a cost index of 96. The rent-to-income ratio is 15.3%—below the 30%% threshold considered affordable by HUD.
What is the average rent in O'Fallon, IL?
The median gross rent in O'Fallon, IL is $1,312 per month according to the US Census Bureau ACS 2023 data. Annual rent costs approximately $15,744.
What is the median household income in O'Fallon?
The median household income in O'Fallon, IL is $102,793 per year. This compares to the national median of approximately $80,000.
What are the taxes like in Illinois?
Illinois has a top income tax rate of 4.95%, a sales tax of 6.25%, and an effective property tax rate of 2.07%.