Union, MO Demographics

A map of Union's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	11,056	10,970	86.5%	88.8%
Multiracial	954	686	7.5%	5.6%
Hispanic	314	350	2.5%	2.8%
Black	284	176	2.2%	1.4%
Asian	164	69	1.3%	0.6%
Native American/Other	9	97	0.1%	0.8%

Union, Missouri has an estimated population of 12,781, an increase from the 12,348 recorded in the 2020 Census. The population is 86.5% White, 7.5% Multiracial, 2.5% Hispanic, 2.2% Black, 1.3% Asian, and 0.1% Native American/Other. This demographic dot map shows the population of Union, with one dot drawn for each person counted by the Census, color-coded by race.

Union has become more racially diverse since the 2020 Census. It is considerably less diverse than Missouri overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Union, that probability was 20.7% in 2020 and 24.5% in the most recent ACS estimates.

Union is ranked the 73rd most populous place in Missouri, out of 1,082 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Union was ranked the 74th most populous place in the 2020 Census.

Union's White Population

11,056 residents of Union, or 86.5% of the population, identify as White. The share of White residents in Union is considerably higher than in Missouri overall, where 76.3% of the population is White. Union ranks 607th statewide in terms of White residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Union's White population has remained roughly the same. White residents' share of Union's population has decreased from 88.8% to 86.5%.

Union is less White than neighboring St. Clair (89.6% White), Parkway (88.5% White), Villa Ridge (88.6% White), Washington (91.7% White), and Lake St. Clair (93% White).

Union's Black Population

284 residents of Union, or 2.2% of the population, identify as Black. The share of Black residents in Union is lower than in Missouri overall, where 10.9% of the population is Black. Union ranks 346th statewide in terms of Black residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Union's Black population has grown by an estimated 61.4%. Black residents' share of Union's population has increased from 1.4% to 2.2%.

Union is more Black than neighboring St. Clair (0.6% Black), Parkway (0.5% Black), Villa Ridge (1.3% Black), Washington (0.3% Black), and Lake St. Clair (0% Black).

Union's Asian Population

164 residents of Union, or 1.3% of the population, identify as Asian. The share of Asian residents in Union is comparable to the share in Missouri overall, where 2.1% of the population is Asian. Union ranks 342nd statewide in terms of Asian residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Union's Asian population has grown by an estimated 137.7%. Asian residents' share of Union's population has increased from 0.6% to 1.3%.

Union is more Asian than neighboring St. Clair (0.3% Asian), Parkway (0% Asian), Villa Ridge (0% Asian), Washington (0.2% Asian), and Lake St. Clair (0% Asian).

Union's Hispanic Population

314 residents of Union, or 2.5% of the population, identify as Hispanic. The share of Hispanic residents in Union is slightly lower than in Missouri overall, where 5.2% of the population is Hispanic. Union ranks 416th statewide in terms of Hispanic residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Union's Hispanic population has declined by an estimated 10.3%. Hispanic residents' share of Union's population has remained roughly unchanged at 2.5%.

Union is more Hispanic than neighboring St. Clair (2.4% Hispanic), Parkway (2.4% Hispanic), Washington (2.1% Hispanic), and Lake St. Clair (2.4% Hispanic). Union is less Hispanic than neighboring Villa Ridge (4.2% Hispanic).

Union's Native American/Other Population

9 residents of Union, or 0.1% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Union is comparable to the share in Missouri overall, where 0.7% of the population is Native American/Other. Union ranks 427th statewide in terms of Native American/Other residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Union's Native American/Other population has declined by an estimated 90.7%. Native American/Other residents' share of Union's population has decreased from 0.8% to 0.1%.

Union is more Native American/Other than neighboring St. Clair (0% Native American/Other), and Lake St. Clair (0% Native American/Other). Union is less Native American/Other than neighboring Parkway (2.4% Native American/Other), Villa Ridge (0.4% Native American/Other), and Washington (0.8% Native American/Other).

Union's Multiracial Population

954 residents of Union, or 7.5% of the population, identify as Multiracial. The share of Multiracial residents in Union is slightly higher than in Missouri overall, where 4.8% of the population is Multiracial. Union ranks 387th statewide in terms of Multiracial residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Union's Multiracial population has grown by an estimated 39.1%. Multiracial residents' share of Union's population has increased from 5.6% to 7.5%.

Union is more Multiracial than neighboring St. Clair (7.1% Multiracial), Parkway (6.3% Multiracial), Villa Ridge (5.5% Multiracial), Washington (4.9% Multiracial), and Lake St. Clair (4.6% 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.