County · Louisiana
St. Tammany Parish, Louisiana
St. Tammany Parish, Louisiana. St. Tammany Parish had 279,108 residents in 2025 by the Census Bureau's estimate, up 5.5% since 2020, while Louisiana shrank 0.9%. It holds 11 places (8 cities, villages and boroughs and 3 census-designated) and 59 census tracts. GEOID 22103.
St. Tammany Parish is the county of the Slidell-Mandeville-Covington, LA metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
279,108
Census Bureau estimate (no margin published)
2020 Census count: 264,570 · ACS 2020-2024: 272,421
Median household income
$81,202
±$1,958 (90% margin)
Louisiana: $60,756
Median home value
$284,000
±$5,856 (90% margin)
Louisiana: $216,500
Median gross rent
$1,332
±$35 (90% margin)
Louisiana: $1,064
How many people live in St. Tammany Parish, and is it growing?
The 2020 Census counted 264,570 residents in St. Tammany Parish. The Census Bureau estimates 279,108 for July 1, 2025, up 5.5% since 2020, while Louisiana shrank 0.9%. The 2020-2024 American Community Survey puts the population at 272,421 over 845 square miles of land.
| Measure | St. Tammany Parish | Louisiana | Change since 2015-2019 |
|---|---|---|---|
| Total population | 272,421 | 4,611,961 | +17,266 |
| Households | 105,082±957 | 1,804,780 | +12,120 |
| Average household size | 2.57±0.02 | 2.49 | −0.15 |
| Housing units | 113,911±77 | 2,108,902 | +11,002 |
St. Tammany Parish's population since 2000
From 191,268 in 2000 to 279,108 in 2025: up 45.9%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in St. Tammany Parish?
St. Tammany Parish holds 11 places: 8 cities, villages and boroughs (incorporated places) and 3 census-designated places. The largest is Slidell with 28,341 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Slidell | 28,781 | $70,497 |
|---|---|---|
| Mandeville | 13,192 | $94,405 |
| Covington | 11,564 | $75,851 |
| Lacombe | 8,657 | $72,813 |
| Eden Isle | 7,782 | $78,426 |
| Abita Springs | 2,631 | $77,257 |
| Pearl River | 2,565 | $56,719 |
| Madisonville | 850 | $109,583 |
| Folsom | 769 | $62,375 |
| LewisburgGEOID 2243640 | 420 | $155,179 |
| SunGEOID 2273955 | 392 | not published |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in St. Tammany Parish?
The median resident of St. Tammany Parish is 40.5 years old; 23.6% are under 18 and 18.4% are 65 or older. The largest group is non-Hispanic white residents at 72.4%, then non-Hispanic Black residents at 12.0%. 4.5% of residents were born outside the United States.
| Measure | St. Tammany Parish | Louisiana | Change since 2015-2019 |
|---|---|---|---|
| Median age | 40.5±0.3 | 38.0 | no clear change |
| Under 18 years | 23.6% | 23.5% | – |
| 65 years and over | 18.4% | 16.7% | – |
| Hispanic or Latino (any race) | 8.2% | 7.2% | +2.6 pts |
| White alone, not Hispanic | 72.4%±0.3 pts | 55.7% | −6.2 pts |
| Black or African American alone, not Hispanic | 12.0%±0.5 pts | 30.5% | no clear change |
| Asian alone, not Hispanic | 1.3%±0.1 pts | 1.7% | −0.2 pts |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.1 pts | 0.4% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.3%±0.3 pts | 0.1% | – |
| Two or more races, not Hispanic | 4.6%±0.5 pts | 3.8% | – |
| Some other race alone, not Hispanic | 0.8%±0.3 pts | 0.5% | – |
| Born outside the United States | 4.5%±0.5 pts | 4.9% | no clear change |
| Speak a language other than English at home (age 5+) | 7.0%±0.7 pts | 8.5% | – |
| Civilian veterans (age 18+) | 7.5%±0.5 pts | 6.1% | – |
| With a disability | 16.1%±0.7 pts | 16.3% | – |
| No health insurance coverage | 6.8%±0.6 pts | 7.8% | −1.1 pts |
| High school graduate or higher (age 25+) | 92.0%±0.6 pts | 87.3% | – |
| Bachelor's degree or higher (age 25+) | 37.7%±1.1 pts | 27.0% | +3.9 pts |
| Graduate or professional degree (age 25+) | 13.4%±0.8 pts | 10.1% | – |
| Moved from another state in the past year | 2.4%±0.4 pts | 1.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in St. Tammany Parish earn?
Half of St. Tammany Parish's 105,082 households earn less than $81,202 a year (±$1,958), against $60,756 in Louisiana. In 2015-2019 the median was $84,801 in 2024 dollars, so it fell by $3,599 after inflation. 11.4% of residents live below the poverty line.
| Measure | St. Tammany Parish | Louisiana | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $81,202±$1,958 | $60,756 | −$3,599 |
| Mean household income | $109,896±$3,236 | $87,038 | – |
| Per capita income | $43,364±$1,249 | $35,038 | no clear change |
| People below the poverty line | 11.4%±1.1 pts | 18.9% | no clear change |
| Children under 18 below the poverty line | 15.0%±2.3 pts | 25.4% | no clear change |
| Households receiving SNAP | 9.0%±1.0 pts | 17.3% | – |
| Households with a broadband subscription | 94.1%±0.6 pts | 86.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in St. Tammany Parish?
Owners occupy 78.9% of St. Tammany Parish's occupied homes and renters 21.1%. The median owner-occupied home is valued at $284,000 by its owner (±$5,856). The median renter pays $1,332 a month including utilities, and 42.8% of renters pay 35% or more of their income on rent.
| Measure | St. Tammany Parish | Louisiana | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $284,000±$5,856 | $216,500 | +$15,093 |
| Median gross rent | $1,332±$35 | $1,064 | no clear change |
| Renters paying 35% or more of income on rent | 42.8%±3.4 pts | 46.3% | no clear change |
| Median monthly owner costs, with a mortgage | $1,813±$41 | $1,604 | – |
| Owner-occupied homes | 78.9%±1.1 pts | 67.4% | no clear change |
| Housing units | 113,911±77 | 2,108,902 | +11,002 |
| Homeowner vacancy rate | 1.1%±0.4 pts | 1.3% | – |
| Rental vacancy rate | 6.6%±1.9 pts | 7.8% | – |
| Single-family detached homes | 77.4%±1.1 pts | 65.3% | – |
| Mobile homes | 6.5%±0.7 pts | 12.6% | – |
| Built 2020 or later | 3.3%±0.5 pts | 1.8% | – |
| Built 1939 or earlier | 1.6%±0.3 pts | 6.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is St. Tammany Parish building?
Builders took permits for 1,096 new housing units across St. Tammany Parish in 2025 (1,086 single-family), 3.9 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in St. Tammany Parish get to work?
77.1% of St. Tammany Parish's workers drive alone and 13.2% work from home. The average trip to work takes 31.5 minutes. The unemployment rate in 2020-2024 averaged 4.8%.
| Measure | St. Tammany Parish | Louisiana | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 62.9%±0.9 pts | 59.3% | – |
| Unemployment rate | 4.8%±0.6 pts | 6.3% | no clear change |
| Drove alone to work | 77.1%±1.2 pts | 78.6% | – |
| Carpooled | 7.2%±0.8 pts | 8.7% | – |
| Public transportation | 0.1%±0.1 pts | 0.9% | – |
| Walked | 0.8%±0.3 pts | 1.8% | – |
| Worked from home | 13.2%±1.0 pts | 8.1% | +7.2 pts |
| Mean travel time to work | 31.5 min±0.7 | 25.7 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are St. Tammany Parish's census tracts?
St. Tammany Parish is divided into 59 census tracts. Among those with a reliable estimate, median household income runs from $44,911 (Tract 401.08) to $173,403 (Tract 412.08).
All 59 census tracts of St. Tammany Parish, with their figures
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does St. Tammany Parish compare with Louisiana's other counties?
| Measure | Rank |
|---|---|
| Population | 4th of 64 |
| Growth 2020-2025 | 7th of 64 |
| Residents per square mile | 6th of 64 |
| Median household income | 4th of 64 |
| Median home value | 2nd of 64 |
| Median gross rent | 4th of 64 |
| Poverty rate | 61st of 64 |
| Bachelor's degree or higher | 3rd of 64 |
| Median age | 18th of 64 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for St. Tammany Parish are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.