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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in St. Mary Parish, Louisiana

St. Mary Parish has an effective property tax rate of 0.39%. On the median home value of $138,900, that's roughly $545 per year. Median household income is $52,576.

Effective Property Tax Rate1
0.39%
median tax $545 ÷ median home $138,900
Median Home Value1
$138,900
owner-occupied
Median Household Income1
$52,576
per-capita $28,265
Est. Annual Tax on Median Home1
$545
at 0.39% effective rate

What you'll pay, at a glance

Property taxes are the largest local tax most homeowners pay. The effective rate measures the real tax bill as a share of home value — a more useful number than the nominal “mill rate,” because assessment practices vary county to county.

MetricSt. Mary ParishLouisiana (state context)
Effective property tax rate10.39%0.44%
Median home value1$138,900—
State income tax3top rate 3.00%top rate 3.00%
State sales tax310.13% combined10.13% combined

How this is calculated

The effective property tax rate is the median real-estate tax bill divided by the median home value — both for owner-occupied homes, from the U.S. Census Bureau's American Community Survey (ACS 5-year estimates)1. Median income is also from the ACS1. Federal and state income-tax figures use IRS2 and Tax Foundation3 data.

About St. Mary Parish, LA

Homes in St. Mary Parish, Louisiana, come with a median value of $138,900, and the annual property tax bill on such a home averages just $545. That works out to an effective rate of 0.392%, which sits below Louisiana's statewide median of 0.438% and well under the national figure of 0.794%. Among the parish's 64 counties, it ranks 37th by rate. For buyers weighing a move to Amelia, Berwick, or Patterson, the combination of lower-than-average home prices and a below-average tax rate can ease the upfront and ongoing costs of ownership. Households here earn a median of $52,576, with per-capita income at $28,265. Those figures mean the yearly tax obligation stays small next to what families bring in, which can help stretch a budget toward other expenses or savings.

Frequently asked questions

What is the property tax rate in St. Mary Parish, LA?
The effective rate is 0.39% — meaning the median tax bill equals about 0.39% of the median home value.
How much are property taxes on a median home?
On the median home ($138,900), the estimated annual bill is about $545.
Is St. Mary Parish's rate high or low?
Compare it to the state median of 0.44% and the national average near 1.1%.
How does the effective rate differ from my mill rate?
A mill rate is the nominal levy per $1,000 of assessed value. The effective rate reflects what you actually pay after exemptions and assessments — it's the median tax bill as a share of median home value, so it better predicts your real cost.
Will a reassessment raise my tax bill?
Not necessarily. If your home's assessed value rises, your bill can go up, but only if the mill rate and exemptions stay flat. Contact the St. Mary Parish assessor's office to review your current assessment.
Can I appeal my property tax assessment?
Yes. Most counties allow an appeal when you believe the assessed value exceeds the market value. File with the St. Mary Parish assessor within the local deadline, typically with comparable sales as evidence.
Sources
[1] U.S. Census Bureau — ACS 5-Year (2023) — Median home value (B25077), median real-estate taxes (B25103), median household income (B19013), per-capita income (B19301).
[2] IRS — Statistics of Income — County income, AGI, and real-estate taxes paid.
[3] Tax Foundation — State income, sales, corporate, and estate/inheritance tax rates.