Best Mortgage Rates in St. Tammany County, Louisiana
Northshore parish across Lake Pontchartrain from New Orleans with fast growth.
Rate data: Freddie Mac PMMS · Updated September 8, 2026 (build 2026-09-08)
| Loan Type | St. Tammany County | Louisiana Avg | National |
|---|---|---|---|
| 30-Year Fixed | 6.760% | 6.710% | 6.710% |
| 15-Year Fixed | 6.010% | 5.960% | 5.875% |
| 30-Year FHA | 6.510% | 6.460% | 6.375% |
| 30-Year VA | 6.260% | 6.210% | 6.125% |
County figures are the Louisiana average adjusted for local market conditions. Actual rates vary by lender, credit score, and loan size.
In St. Tammany County, property tax runs 0.66% of home value — $170/mo on the $308,500 median home. Low carry cost changes the math in your favor: your PITI leaves 0 points of DTI headroom versus the 43% ceiling before you account for other debt.
That headroom is a real asset. It's what lets you hold the 30-year fixed term instead of stretching to an ARM to afford the payment — the fixed-rate cost delta is roughly $116/mo on this loan size, and low-tax counties are where locking it costs you the least. Insurance still varies by zip ($200/mo here), but on the tax line you have no reason to compromise on term or rate structure.
Low tax burden in St. Tammany County means your DTI has room to work
Your PITI sits about 0 points under the 43% ceiling — that's buying power. Lock the 30-year fixed and match against lenders that price low-tax-county files well.
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Frequently Asked Questions
What is the average mortgage rate in St. Tammany County, Louisiana?
The average 30-year fixed rate in St. Tammany County is about 6.760% as of September 8, 2026, based on the state average of 6.710% adjusted for local market conditions. Your actual rate depends on credit score, loan size, and lender.
How much house can I afford in St. Tammany County?
With a typical 20% down payment and the 6.760% county-average rate, a $100,000 household income qualifies for roughly a $400,000-$450,000 home before property taxes and insurance. Use our affordability calculator for your exact numbers.
Should I get a 15-year or 30-year mortgage in St. Tammany County?
A 15-year loan runs about 6.010% in St. Tammany County — around 0.75% lower than a 30-year — but the monthly payment is roughly 40-50% higher. Choose 15 years if you want to minimize total interest; choose 30 if monthly cash flow matters more.