Assumption County Demographics

A map of Assumption County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	13,093	13,580	63.9%	64.5%
Black	5,664	5,973	27.7%	28.4%
Hispanic	872	914	4.3%	4.3%
Multiracial	499	416	2.4%	2.0%
Asian	186	56	0.9%	0.3%
Native American/Other	170	100	0.8%	0.5%

Assumption County, Louisiana has an estimated population of 20,484, a slight decrease from the 21,039 recorded in the 2020 Census. The population is 63.9% White, 27.7% Black, 4.3% Hispanic, 2.4% Multiracial, 0.9% Asian, and 0.8% Native American/Other. This demographic dot map shows the population of Assumption County, with one dot drawn for each person counted by the Census, color-coded by race.

Assumption has become more racially diverse since 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 Assumption County, that probability was 50.0% in 2020 and 51.2% in the most recent ACS estimates.

Assumption County is ranked the 43rd most populous county in Louisiana, out of 64 counties. Assumption County was ranked the 43rd most populous county in the 2020 Census.

Assumption County's White Population

13,093 residents of Assumption County, or 63.9% of the population, identify as White. The share of White residents in Assumption County is higher than in Louisiana overall, where 55.7% of the population is White. Assumption County ranks 21st statewide in terms of White residents as a share of the population, out of 64 counties.

Since the 2020 Census, Assumption County's White population has declined by an estimated 3.6%. White residents' share of Assumption County's population has decreased from 64.5% to 63.9%.

Assumption County is more White than neighboring St. James County (49.3% White), Ascension County (63.5% White), Iberville County (46% White), St. Mary County (53.4% White), and St. Martin County (63.1% White).

Assumption County's Black Population

5,664 residents of Assumption County, or 27.7% of the population, identify as Black. The share of Black residents in Assumption County is slightly lower than in Louisiana overall, where 30.5% of the population is Black. Assumption County ranks 32nd statewide in terms of Black residents as a share of the population, out of 64 counties.

Since the 2020 Census, Assumption County's Black population has declined by an estimated 5.2%. Black residents' share of Assumption County's population has decreased from 28.4% to 27.7%.

Assumption County is more Black than neighboring Ascension County (22.8% Black). Assumption County is less Black than neighboring St. James County (47.4% Black), Iberville County (43.2% Black), St. Mary County (28.8% Black), and St. Martin County (28.6% Black).

Assumption County's Asian Population

186 residents of Assumption County, or 0.9% of the population, identify as Asian. The share of Asian residents in Assumption County is comparable to the share in Louisiana overall, where 1.7% of the population is Asian. Assumption County ranks 50th statewide in terms of Asian residents as a share of the population, out of 64 counties.

Since the 2020 Census, Assumption County's Asian population has grown by an estimated 232.1%. Asian residents' share of Assumption County's population has increased from 0.3% to 0.9%.

Assumption County is more Asian than neighboring St. James County (0% Asian), Iberville County (0% Asian), and St. Martin County (0.8% Asian). Assumption County is less Asian than neighboring Ascension County (1% Asian), and St. Mary County (1% Asian).

Assumption County's Hispanic Population

872 residents of Assumption County, or 4.3% of the population, identify as Hispanic. The share of Hispanic residents in Assumption County is slightly lower than in Louisiana overall, where 7.2% of the population is Hispanic. Assumption County ranks 28th statewide in terms of Hispanic residents as a share of the population, out of 64 counties.

Since the 2020 Census, Assumption County's Hispanic population has declined by an estimated 4.6%. Hispanic residents' share of Assumption County's population has remained roughly unchanged at 4.3%.

Assumption County is more Hispanic than neighboring St. James County (2% Hispanic), and St. Martin County (3.6% Hispanic). Assumption County is less Hispanic than neighboring Ascension County (8.4% Hispanic), Iberville County (5.2% Hispanic), and St. Mary County (9.8% Hispanic).

Assumption County's Native American/Other Population

170 residents of Assumption County, or 0.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Assumption County is comparable to the share in Louisiana overall, where 1% of the population is Native American/Other. Assumption County ranks 48th statewide in terms of Native American/Other residents as a share of the population, out of 64 counties.

Since the 2020 Census, Assumption County's Native American/Other population has grown by an estimated 70.0%. Native American/Other residents' share of Assumption County's population has remained roughly unchanged at 0.8%.

Assumption County is more Native American/Other than neighboring St. James County (0.2% Native American/Other), Ascension County (0.6% Native American/Other), and St. Martin County (0.6% Native American/Other). Assumption County is less Native American/Other than neighboring Iberville County (0.9% Native American/Other), and St. Mary County (1.8% Native American/Other).

Assumption County's Multiracial Population

499 residents of Assumption County, or 2.4% of the population, identify as Multiracial. The share of Multiracial residents in Assumption County is comparable to the share in Louisiana overall, where 3.8% of the population is Multiracial. Assumption County ranks 61st statewide in terms of Multiracial residents as a share of the population, out of 64 counties.

Since the 2020 Census, Assumption County's Multiracial population has grown by an estimated 20.0%. Multiracial residents' share of Assumption County's population has remained roughly unchanged at 2.4%.

Assumption County is more Multiracial than neighboring St. James County (1.1% Multiracial). Assumption County is less Multiracial than neighboring Ascension County (3.6% Multiracial), Iberville County (4.6% Multiracial), St. Mary County (5.2% Multiracial), and St. Martin County (3.3% 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.