Average mortgage payment in Cook County, IL (2026)
The average mortgage payment in Cook County on a median-priced home (~$400,000) is roughly $3,576/month — assuming 10% down at a 6.85% 30-year fixed rate and Illinois's 2.27% effective property tax rate (full PITI).
To carry that payment under the standard 28% front-end DTI rule, you'd need an annual household income near $153,240. County population is roughly 5,275,541.
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How Cook County compares to Illinois
The typical home in Cook County is 54% above the statewide median of $260,000 in Illinois. Property tax is set at the state's effective rate of 2.27% — local millage and special assessments vary by county, but this is the right starting point.
The payment above bakes in principal, interest, property tax, and homeowners insurance — it does not include HOA dues or mortgage insurance (PMI). PMI kicks in automatically when down payment is below 20% on a conventional loan. For a full breakdown, run your own numbers in the main calculator.
Frequently asked questions
What is the average mortgage payment in Cook County?+
On a median Cook County home (~$400,000) at a 6.85% 30-year fixed rate with 10% down, all-in PITI runs about $3,576/month, including ~$757 in property tax.
What income do I need to buy a home in Cook County?+
Using the 28% front-end DTI rule, you'd need roughly $153,240 in annual gross household income to comfortably carry the median Cook County home.
How does Cook County compare to the rest of Illinois?+
Cook County's median home ($400,000) is 54% above the Illinois median of $260,000.
Does this include HOA fees or PMI?+
No. HOA dues vary too widely to assume a default — add them directly to the payment. PMI applies when you put less than 20% down on a conventional loan; the main calculator factors it in automatically.