Average mortgage payment in St. Tammany County, LA (2026)
The average mortgage payment in St. Tammany County on a median-priced home (~$235,000) is roughly $1,855/month — assuming 10% down at a 6.85% 30-year fixed rate and Louisiana's 0.55% 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 $79,482. County population is roughly 264,570.
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How St. Tammany County compares to Louisiana
The typical home in St. Tammany County is 18% above the statewide median of $200,000 in Louisiana. Property tax is set at the state's effective rate of 0.55% — 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 St. Tammany County?+
On a median St. Tammany County home (~$235,000) at a 6.85% 30-year fixed rate with 10% down, all-in PITI runs about $1,855/month, including ~$108 in property tax.
What income do I need to buy a home in St. Tammany County?+
Using the 28% front-end DTI rule, you'd need roughly $79,482 in annual gross household income to comfortably carry the median St. Tammany County home.
How does St. Tammany County compare to the rest of Louisiana?+
St. Tammany County's median home ($235,000) is 18% above the Louisiana median of $200,000.
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.