St. Martin County Demographics

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

St. Martin County, Louisiana had a population of 51,767 in 2020. It was 63.6% White, 29.1% Black, 0.8% Asian, 3.2% Hispanic, 0.7% Native American/Other, and 2.6% Multiracial. This map presents the population of St. Martin County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

St. Martin County is the 21st most populous county of the 64 counties in Louisiana.

St. Martin County's White Population

32,919 residents of St. Martin County identify as White, or 63.6%. This makes the White share of the population of St. Martin County slightly larger than the White share of the population of Louisiana (55.8% White). Of the 64 counties in Louisiana, St. Martin County is ranked #23 in terms of White residents as a share of the population.

St. Martin County is more White than neighboring Iberville County (48.4% White), Iberia County (55.2% White), West Baton Rouge County (51.9% White), Lafayette County (62.2% White), and St. Mary County (53.3% White).

St. Martin County's Black Population

15,050 residents of St. Martin County identify as Black, or 29.1%. This makes the Black share of the population of St. Martin County roughly similar to the Black share of the population of Louisiana (31.2% Black). Of the 64 counties in Louisiana, St. Martin County is ranked #31 in terms of Black residents as a share of the population.

St. Martin County is more Black than neighboring Lafayette County (25.1% Black). St. Martin County is less Black than neighboring Iberville County (44% Black), Iberia County (32.9% Black), West Baton Rouge County (39.4% Black), and St. Mary County (30.3% Black).

St. Martin County's Asian Population

440 residents of St. Martin County identify as Asian, or 0.8%. This makes the Asian share of the population of St. Martin County roughly similar to the Asian share of the population of Louisiana (1.8% Asian). Of the 64 counties in Louisiana, St. Martin County is ranked #25 in terms of Asian residents as a share of the population.

St. Martin County is more Asian than neighboring Iberville County (0.4% Asian). St. Martin County is less Asian than neighboring Iberia County (2.8% Asian), Lafayette County (2.2% Asian), and St. Mary County (1.3% Asian).

St. Martin County's Hispanic Population

1,679 residents of St. Martin County identify as Hispanic, or 3.2%. This makes the Hispanic share of the population of St. Martin County roughly similar to the Hispanic share of the population of Louisiana (6.9% Hispanic). Of the 64 counties in Louisiana, St. Martin County is ranked #42 in terms of Hispanic residents as a share of the population.

St. Martin County is less Hispanic than neighboring Iberville County (4.7% Hispanic), Iberia County (5.6% Hispanic), West Baton Rouge County (4.6% Hispanic), Lafayette County (6.6% Hispanic), and St. Mary County (9.2% Hispanic).

St. Martin County's Native American/Other Population

350 residents of St. Martin County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 0.7%. This makes the Native American/Other share of the population of St. Martin County roughly similar to the Native American/Other share of the population of Louisiana (1% Native American/Other). Of the 64 counties in Louisiana, St. Martin County is ranked #29 in terms of Native American/Other residents as a share of the population.

St. Martin County is more Native American/Other than neighboring Iberville County (0.5% Native American/Other), and West Baton Rouge County (0.5% Native American/Other). St. Martin County is less Native American/Other than neighboring St. Mary County (2.2% Native American/Other).

St. Martin County's Multiracial Population

1,329 residents of St. Martin County identify as Multiracial, or 2.6%. This makes the Multiracial share of the population of St. Martin County roughly similar to the Multiracial share of the population of Louisiana (3.4% Multiracial). Of the 64 counties in Louisiana, St. Martin County is ranked #46 in terms of Multiracial residents as a share of the population.

St. Martin County is more Multiracial than neighboring Iberville County (2% Multiracial). St. Martin County is less Multiracial than neighboring Iberia County (3% Multiracial), West Baton Rouge County (2.8% Multiracial), Lafayette County (3.2% Multiracial), and St. Mary County (3.7% Multiracial).

Source: 2020 Census State Redistricting Data and Census TIGER/Line Shapefiles.