How many people live in St. Tammany Parish, LA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 277,600 people living in St. Tammany Parish, LA. That makes St. Tammany Parish the fourth-most populous parish in Louisiana. It is home to 6% of people living in the state.
278K
population of St. Tammany Parish, LA (2024)
6%
County share of the Louisiana population (2024)
About 277,600 people lived in St. Tammany Parish, LA in 2024.
Population estimates, 2000–2024
What are St. Tammany Parish, LA’s age demographics?
About 53,800 St. Tammany Parish, LA residents are aged 65 and older in 2024. That represents 19.4% of its population. For comparison, the age group represents 17.8% of Louisiana’s population and 18% in the US overall.
Another 64,100 St. Tammany Parish residents, or 23.1% of the population, were children under 18. For comparison, the age group represents 23.3% of Louisiana’s population and 21.6% in the US overall.
A lower share of St. Tammany Parish, LA's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are St. Tammany Parish, LA’s racial and ethnic demographics?
Non-Hispanic white residents make up 72.7% of the St. Tammany Parish, LA population, higher than the national share of 57.5%. St. Tammany Parish, LA also has a larger share of people identifying as non-Hispanic Black or African American (14.6%) than the US overall (12.6%).
In contrast, St. Tammany Parish’s Hispanic population accounts for 8.7%, below the 20% nationwide, and the non-Hispanic Asian population makes up 1.6% of the parish, compared with 6.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
St. Tammany Parish, LA has a higher share of a non-Hispanic white population than Louisiana as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in St. Tammany Parish, LA is Slidell with about 28,400 residents in 2024.
Cities and towns in St. Tammany Parish, LA ranked by population
Population (2024), includes only portions within parish
| City or town | Population | |
|---|---|---|
| 1. | Slidell | 28,440 |
| 2. | Mandeville | 12,973 |
| 3. | Covington | 11,686 |
| 4. | Abita Springs | 2,752 |
| 5. | Pearl River | 2,647 |
| 6. | Madisonville | 875 |
| 7. | Folsom | 829 |
| 8. | Sun | 399 |
| 9. | Balance of St. Tammany Parish | 217,014 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
