St. Tammany Parish, Louisiana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 4th-largest in Louisiana
The population of St. Tammany Parish, Louisiana is 269,331 as of the 2023 American Community Survey, making it the 4th-largest county in Louisiana. The median household income is $79,277, the median home value is $272,200, and the median age is 40.4.
The population of St. Tammany Parish has grown 18.4% since 2010 (234,564 → 277,615), a +1.21% annualized rate.
269,331
Population
+1.21%
Annual growth
319
People / sq mi
$79,277
Median Income
$272,200
Median Home Value
St. Tammany Parish covers 845 sq mi of land at 318.6 people per square mile.
About St. Tammany Parish, LA
St. Tammany Parish is defined demographically by education — 36.6% of adults hold a bachelor’s degree, near the national average. St. Tammany Parish is a county in Louisiana with a population of 269,331. That makes it one of the ten largest counties in Louisiana in the country, at #4 by population.
The typical household earns $79,277 a year, near the US median of $78,538. About 9.5% of residents live below the federal poverty level, below the national 12.4%. A typical home is worth $272,200, with typical rent around $1,305.
College attainment is above the local norm at 36.6%, near the national 35.0%. About 12.4% of workers primarily work from home, below the national 14.0%, and the average commute runs about 31 minutes each way.
The education numbers are the throughline: a college-heavy population in St. Tammany Parish usually coincides with higher incomes and a workforce concentrated in professional and information industries.
St. Tammany Parish Population History (2010-2024)
The county of St. Tammany Parish had a population of 234,564 in 2010 and 277,615 in 2024, a 18.4% growth over 14 years. The peak was 277,615 in 2024. Average annual growth rate: 1.21%.
277,615
Population (2024)
234,564
Population (2010)
277,615
Peak (2024)
1.21%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 234,564 |
| 2011 | 236,900 |
| 2012 | 239,154 |
| 2013 | 242,074 |
| 2014 | 245,390 |
| 2015 | 249,116 |
| 2016 | 252,676 |
| 2017 | 256,212 |
| 2018 | 258,598 |
| 2019 | 261,303 |
| 2020 | 265,007 |
| 2021 | 270,188 |
| 2022 | 273,494 |
| 2023 | 275,801 |
| 2024 | 277,615 |
Race & Ethnicity
| White | 75.0% |
| Black or African American | 12.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.0% |
| Two or More Races | 0.0% |
Age & Sex
40.4
Median Age
51.0%
Female
49.0%
Male
18.0%
Age 65+
Age Distribution
Children (under 15): 19.3% · Seniors (65+): 18.0%
Income & Poverty
| Median household income | $79,277+$19,254 vs state |
| Mean household income | $106,854 |
| Per-capita income | $41,854 |
| Poverty rate | 9.5%-4.7% vs state |
| Unemployment rate | 3.0% |
| Employment-to-population | 59.0% |
Top Industries by Employment
The largest employment sector in St. Tammany Parish is professional & business services, accounting for 24.4% of workers.
How residents commute
0.1%
Drive alone
0.8%
Carpool
77.4%
Public transit
12.4%
Work from home
31.4 min
Avg commute
Housing
$272,200+$63,500 vs state
Median home value
$1,305
Median rent
78.8%
Homeownership rate
112,414
Total housing units
91.9%
Occupied
8.1%
Vacant
21.2%
Renter-occupied
Social & access
92.7%
With health insurance
96.0%
With broadband internet
23.5%
Foreign-born
7.2%
Veterans (18+)
16.9%
With a disability
93.3%
Speak language other than English at home
Education
91.4%
High School+
36.6%
Bachelor's+
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County rankings
Frequently Asked Questions
St. Tammany Parish, Louisiana has a population of 269,331 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 4th-largest county in Louisiana. Population density is 319 people per square mile.
The population of St. Tammany Parish has grown 18.4% since 2010 (234,564 → 277,615), a +1.21% annualized rate.
The median household income in St. Tammany Parish, Louisiana is $79,277, with mean (average) household income of $106,854 and per-capita income of $41,854. 9.5% of residents live below the federal poverty level.
In St. Tammany Parish, the largest racial and ethnic groups are White (75.0%), Black or African American (12.2%), Hispanic or Latino (2.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in St. Tammany Parish, Louisiana is 40.4 years. Residents are 51.0% female and 49.0% male.
The median home value in St. Tammany Parish is $272,200 and median monthly rent is $1,305. 78.8% of occupied housing units are owner-occupied. The county has 112,414 total housing units, 8.1% of which are vacant.
The largest employment sector in St. Tammany Parish, Louisiana is professional, scientific, and management services, employing 24.4% of workers. The unemployment rate is 3.0%.
New Orleans is among the largest cities associated with St. Tammany Parish, Louisiana, with a population of 376,035.
St. Tammany Parish, LA Climate
St. Tammany Parish, LA has an average annual temperature of 19.4°C (67°F) and receives about 1574 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
19.4°C
Avg Temp
1574
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 10° / 50° | 136 mm |
| February | 12° / 53° | 141 mm |
| March | 16° / 60° | 149 mm |
| April | 19° / 66° | 123 mm |
| May | 23° / 74° | 129 mm |
| June | 26° / 79° | 126 mm |
| July | 27° / 81° | 163 mm |
| August | 27° / 81° | 148 mm |
| September | 25° / 77° | 129 mm |
| October | 20° / 68° | 79 mm |
| November | 15° / 59° | 115 mm |
| December | 12° / 53° | 136 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit St. Tammany Parish, LA
The most comfortable months to visit St. Tammany Parish, LA are typically October, April and May, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 33°C high). The coldest is January (near 4°C low). July is usually the wettest month.
Where to stay near St. Tammany Parish
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.