St. Tammany Parish, Louisiana
Located in Louisiana, St. Tammany Parish has a population of 272,421 residents and a median age of 40.5 years, making it the #264 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 11.4%. The median home value is $284,000, and the median household income is $81,202, which is 8% above the national median.
Demographics
St. Tammany Parish has a population of 272,421, making it the #264 most populous county in the US. The median age is 40.5 years, which is 4.1% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in St. Tammany Parish is $81,202, ranking #535 out of 3,222 counties — 8.1% above the national median. The poverty rate is 11.4% and unemployment stands at 4.7%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in St. Tammany Parish is $284,000 (+0.7% vs national). Renters pay a median of $1,332/mo and the homeownership rate is 78.9%.
Median Home Value Trend
Rankings →Household Type
Education
In St. Tammany Parish, 37.7% of adults age 25+ hold a bachelor's degree or higher, which is 11.8% above the national average, ranking #360 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in St. Tammany Parish is 76.5 years. 19.0% of adults report poor or fair health and 8.0% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
16.0% of adults in St. Tammany Parish smoke , 35.1% are obese , and 22.4% report excessive drinking. The drug overdose death rate is 50.7 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in St. Tammany Parish is 6.3 per 100,000 and the suicide rate is 18.4 per 100,000. Motor vehicle deaths occur at a rate of 13.8 per 100,000.
Homicide Rate Trend
Families & Children
14.5% of children in St. Tammany Parish live in poverty and the infant mortality rate is 4.8 per 1,000 live births. The teen birth rate is 13.3 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in St. Tammany Parish is 73.1%. The mean commute time is 34.4 min, which is 24.7% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, St. Tammany Parish voted Republican with a margin of 43.8%. The vote was 27.3% Dem / 71.1% Rep. Compared to 2020, the margin shifted +0.4 toward Democrats .
Vote Share Over Time
About St. Tammany Parish, Louisiana
St. Tammany Parish, Louisiana has a total population of 272,421, making it the 264th most populous county in the United States. The median age in St. Tammany Parish is 40.5 years, which is 4.1% above the national median of 38.9 years.
The median household income in St. Tammany Parish is $81,202, which ranks #535 of 3,222 counties nationwide. This is 8.1% above the national median of $75,149. The poverty rate is 11.4%, lower than the national rate of 12.6%. The unemployment rate stands at 4.7%.
The median home value in St. Tammany Parish is $284,000, 0.7% above the national median. Renters in St. Tammany Parish pay a median gross rent of $1,332 per month. The homeownership rate is 78.9%, compared to the national rate of 64.4%.
In St. Tammany Parish, 37.7% of residents aged 25 and older hold a bachelor's degree or higher, 11.8% above the national average of 33.7%. Health insurance coverage stands at 93.2% of the population. The average commute time for workers is 34.4 min.
St. Tammany Parish is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 72.4% of the population, followed by Black (non-Hispanic) (12.0%) and Hispanic or Latino (8.2%).
All data for St. Tammany Parish, Louisiana comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.