St. Mary County Demographics

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

St. Mary County, Louisiana had a population of 49,406 in 2020. It was 53.3% White, 30.3% Black, 1.3% Asian, 9.2% Hispanic, 2.2% Native American/Other, and 3.7% Multiracial. This map presents the population of St. Mary County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

St. Mary County is the 22nd most populous county of the 64 counties in Louisiana.

St. Mary County's White Population

26,334 residents of St. Mary County identify as White, or 53.3%. This makes the White share of the population of St. Mary County roughly similar to the White share of the population of Louisiana (55.8% White). Of the 64 counties in Louisiana, St. Mary County is ranked #45 in terms of White residents as a share of the population.

St. Mary County is more White than neighboring Iberville County (48.4% White). St. Mary County is less White than neighboring Iberia County (55.2% White), Assumption County (64.5% White), St. Martin County (63.6% White), and Terrebonne County (62.8% White).

St. Mary County's Black Population

14,950 residents of St. Mary County identify as Black, or 30.3%. This makes the Black share of the population of St. Mary County roughly similar to the Black share of the population of Louisiana (31.2% Black). Of the 64 counties in Louisiana, St. Mary County is ranked #29 in terms of Black residents as a share of the population.

St. Mary County is more Black than neighboring Assumption County (28.4% Black), St. Martin County (29.1% Black), and Terrebonne County (19.2% Black). St. Mary County is less Black than neighboring Iberia County (32.9% Black), and Iberville County (44% Black).

St. Mary County's Asian Population

647 residents of St. Mary County identify as Asian, or 1.3%. This makes the Asian share of the population of St. Mary County roughly similar to the Asian share of the population of Louisiana (1.8% Asian). Of the 64 counties in Louisiana, St. Mary County is ranked #19 in terms of Asian residents as a share of the population.

St. Mary County is more Asian than neighboring Assumption County (0.3% Asian), St. Martin County (0.8% Asian), Iberville County (0.4% Asian), and Terrebonne County (1.2% Asian). St. Mary County is less Asian than neighboring Iberia County (2.8% Asian).

St. Mary County's Hispanic Population

4,524 residents of St. Mary County identify as Hispanic, or 9.2%. This makes the Hispanic share of the population of St. Mary County roughly similar to the Hispanic share of the population of Louisiana (6.9% Hispanic). Of the 64 counties in Louisiana, St. Mary County is ranked #5 in terms of Hispanic residents as a share of the population.

St. Mary County is more Hispanic than neighboring Iberia County (5.6% Hispanic), Assumption County (4.3% Hispanic), St. Martin County (3.2% Hispanic), Iberville County (4.7% Hispanic), and Terrebonne County (6.7% Hispanic).

St. Mary County's Native American/Other Population

1,103 residents of St. Mary County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 2.2%. This makes the Native American/Other share of the population of St. Mary 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. Mary County is ranked #5 in terms of Native American/Other residents as a share of the population.

St. Mary County is more Native American/Other than neighboring Iberia County (0.7% Native American/Other), Assumption County (0.5% Native American/Other), St. Martin County (0.7% Native American/Other), and Iberville County (0.5% Native American/Other). St. Mary County is less Native American/Other than neighboring Terrebonne County (5.6% Native American/Other).

St. Mary County's Multiracial Population

1,848 residents of St. Mary County identify as Multiracial, or 3.7%. This makes the Multiracial share of the population of St. Mary County roughly similar to the Multiracial share of the population of Louisiana (3.4% Multiracial). Of the 64 counties in Louisiana, St. Mary County is ranked #15 in terms of Multiracial residents as a share of the population.

St. Mary County is more Multiracial than neighboring Iberia County (3% Multiracial), Assumption County (2% Multiracial), St. Martin County (2.6% Multiracial), and Iberville County (2% Multiracial). St. Mary County is less Multiracial than neighboring Terrebonne County (4.5% Multiracial).

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