St. Tammany County Demographics

A map of St. Tammany County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	197,214	192,144	72.4%	72.6%
Black	32,750	33,969	12.0%	12.8%
Hispanic	22,407	20,844	8.2%	7.9%
Multiracial	12,667	11,466	4.6%	4.3%
Native American/Other	3,740	2,333	1.4%	0.9%
Asian	3,643	3,814	1.3%	1.4%

St. Tammany County, Louisiana has an estimated population of 272,421, a slight increase from the 264,570 recorded in the 2020 Census. The population is 72.4% White, 12.0% Black, 8.2% Hispanic, 4.6% Multiracial, 1.4% Native American/Other, and 1.3% Asian. This demographic dot map shows the population of St. Tammany County, with one dot drawn for each person counted by the Census, color-coded by race.

St. Tammany is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Louisiana overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In St. Tammany County, that probability was 44.8% in 2020 and 45.2% in the most recent ACS estimates.

St. Tammany County is ranked the 4th most populous county in Louisiana, out of 64 counties. St. Tammany County was ranked the 4th most populous county in the 2020 Census.

St. Tammany County's White Population

197,214 residents of St. Tammany County, or 72.4% of the population, identify as White. The share of White residents in St. Tammany County is significantly higher than in Louisiana overall, where 55.7% of the population is White. St. Tammany County ranks 11th statewide in terms of White residents as a share of the population, out of 64 counties.

Since the 2020 Census, St. Tammany County's White population has grown by an estimated 2.6%. White residents' share of St. Tammany County's population has remained roughly unchanged at 72.4%.

St. Tammany County is more White than neighboring Orleans County (30.1% White), Washington County (62.5% White), and Tangipahoa County (60.5% White). St. Tammany County is less White than neighboring Hancock County (83.4% White), and Pearl River County (79.1% White).

St. Tammany County's Black Population

32,750 residents of St. Tammany County, or 12.0% of the population, identify as Black. The share of Black residents in St. Tammany County is significantly lower than in Louisiana overall, where 30.5% of the population is Black. St. Tammany County ranks 60th statewide in terms of Black residents as a share of the population, out of 64 counties.

Since the 2020 Census, St. Tammany County's Black population has declined by an estimated 3.6%. Black residents' share of St. Tammany County's population has decreased from 12.8% to 12.0%.

St. Tammany County is more Black than neighboring Hancock County (7.1% Black). St. Tammany County is less Black than neighboring Orleans County (53.9% Black), Washington County (26.8% Black), and Tangipahoa County (29.2% Black).

St. Tammany County's Asian Population

3,643 residents of St. Tammany County, or 1.3% of the population, identify as Asian. The share of Asian residents in St. Tammany County is comparable to the share in Louisiana overall, where 1.7% of the population is Asian. St. Tammany County ranks 13th statewide in terms of Asian residents as a share of the population, out of 64 counties.

Since the 2020 Census, St. Tammany County's Asian population has declined by an estimated 4.5%. Asian residents' share of St. Tammany County's population has remained roughly unchanged at 1.3%.

St. Tammany County is more Asian than neighboring Washington County (0.1% Asian), Hancock County (1% Asian), Tangipahoa County (0.8% Asian), and Pearl River County (0.3% Asian). St. Tammany County is less Asian than neighboring Orleans County (2.8% Asian).

St. Tammany County's Hispanic Population

22,407 residents of St. Tammany County, or 8.2% of the population, identify as Hispanic. The share of Hispanic residents in St. Tammany County is comparable to the share in Louisiana overall, where 7.2% of the population is Hispanic. St. Tammany County ranks 12th statewide in terms of Hispanic residents as a share of the population, out of 64 counties.

Since the 2020 Census, St. Tammany County's Hispanic population has grown by an estimated 7.5%. Hispanic residents' share of St. Tammany County's population has remained roughly unchanged at 8.2%.

St. Tammany County is more Hispanic than neighboring Washington County (3.3% Hispanic), Hancock County (4.2% Hispanic), Tangipahoa County (5.8% Hispanic), and Pearl River County (4.3% Hispanic).

St. Tammany County's Native American/Other Population

3,740 residents of St. Tammany County, or 1.4% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in St. Tammany County is comparable to the share in Louisiana overall, where 1% of the population is Native American/Other. St. Tammany County ranks 17th statewide in terms of Native American/Other residents as a share of the population, out of 64 counties.

Since the 2020 Census, St. Tammany County's Native American/Other population has grown by an estimated 60.3%. Native American/Other residents' share of St. Tammany County's population has remained roughly unchanged at 1.4%.

St. Tammany County is more Native American/Other than neighboring Orleans County (1.1% Native American/Other), Washington County (1.1% Native American/Other), Hancock County (1% Native American/Other), Tangipahoa County (0.4% Native American/Other), and Pearl River County (0.8% Native American/Other).

St. Tammany County's Multiracial Population

12,667 residents of St. Tammany County, or 4.6% of the population, identify as Multiracial. The share of Multiracial residents in St. Tammany County is comparable to the share in Louisiana overall, where 3.8% of the population is Multiracial. St. Tammany County ranks 6th statewide in terms of Multiracial residents as a share of the population, out of 64 counties.

Since the 2020 Census, St. Tammany County's Multiracial population has grown by an estimated 10.5%. Multiracial residents' share of St. Tammany County's population has remained roughly unchanged at 4.6%.

St. Tammany County is more Multiracial than neighboring Orleans County (4% Multiracial), Hancock County (3.3% Multiracial), Tangipahoa County (3.3% Multiracial), and Pearl River County (3.5% Multiracial). St. Tammany County is less Multiracial than neighboring Washington County (6.1% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.