Buchanan County Demographics

A map of Buchanan County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	66,629	68,391	79.7%	80.7%
Hispanic	6,318	5,600	7.6%	6.6%
Black	4,685	4,303	5.6%	5.1%
Multiracial	4,392	4,465	5.3%	5.3%
Asian	915	1,048	1.1%	1.2%
Native American/Other	629	986	0.8%	1.2%

Buchanan County, Missouri has an estimated population of 83,568, a slight decrease from the 84,793 recorded in the 2020 Census. The population is 79.7% White, 7.6% Hispanic, 5.6% Black, 5.3% Multiracial, 1.1% Asian, and 0.8% Native American/Other. This demographic dot map shows the population of Buchanan County, with one dot drawn for each person counted by the Census, color-coded by race.

Buchanan has become more racially diverse since the 2020 Census. It is 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 Buchanan County, that probability was 34.0% in 2020 and 35.3% in the most recent ACS estimates.

Buchanan County is ranked the 14th most populous county in Missouri, out of 115 counties. Buchanan County was ranked the 14th most populous county in the 2020 Census.

Buchanan County's White Population

66,629 residents of Buchanan County, or 79.7% of the population, identify as White. The share of White residents in Buchanan County is slightly higher than in Missouri overall, where 76.3% of the population is White. Buchanan County ranks 98th statewide in terms of White residents as a share of the population, out of 115 counties.

Since the 2020 Census, Buchanan County's White population has declined by an estimated 2.6%. White residents' share of Buchanan County's population has decreased from 80.7% to 79.7%.

Buchanan County is more White than neighboring Platte County (76.7% White). Buchanan County is less White than neighboring Andrew County (92.4% White), Doniphan County (88% White), Clinton County (91.9% White), and DeKalb County (87% White).

Buchanan County's Black Population

4,685 residents of Buchanan County, or 5.6% of the population, identify as Black. The share of Black residents in Buchanan County is lower than in Missouri overall, where 10.9% of the population is Black. Buchanan County ranks 23rd statewide in terms of Black residents as a share of the population, out of 115 counties.

Since the 2020 Census, Buchanan County's Black population has grown by an estimated 8.9%. Black residents' share of Buchanan County's population has increased from 5.1% to 5.6%.

Buchanan County is more Black than neighboring Andrew County (1.3% Black), Doniphan County (3% Black), and Clinton County (0.8% Black). Buchanan County is less Black than neighboring Platte County (7.5% Black), and DeKalb County (6.5% Black).

Buchanan County's Asian Population

915 residents of Buchanan County, or 1.1% of the population, identify as Asian. The share of Asian residents in Buchanan County is comparable to the share in Missouri overall, where 2.1% of the population is Asian. Buchanan County ranks 19th statewide in terms of Asian residents as a share of the population, out of 115 counties.

Since the 2020 Census, Buchanan County's Asian population has declined by an estimated 12.7%. Asian residents' share of Buchanan County's population has remained roughly unchanged at 1.1%.

Buchanan County is more Asian than neighboring Andrew County (0.8% Asian), Doniphan County (0.1% Asian), Clinton County (0.2% Asian), and DeKalb County (0.6% Asian). Buchanan County is less Asian than neighboring Platte County (2.5% Asian).

Buchanan County's Hispanic Population

6,318 residents of Buchanan County, or 7.6% of the population, identify as Hispanic. The share of Hispanic residents in Buchanan County is slightly higher than in Missouri overall, where 5.2% of the population is Hispanic. Buchanan County ranks 14th statewide in terms of Hispanic residents as a share of the population, out of 115 counties.

Since the 2020 Census, Buchanan County's Hispanic population has grown by an estimated 12.8%. Hispanic residents' share of Buchanan County's population has increased from 6.6% to 7.6%.

Buchanan County is more Hispanic than neighboring Platte County (7.2% Hispanic), Andrew County (2.6% Hispanic), Doniphan County (3.5% Hispanic), Clinton County (2.6% Hispanic), and DeKalb County (2.4% Hispanic).

Buchanan County's Native American/Other Population

629 residents of Buchanan 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 Buchanan County is comparable to the share in Missouri overall, where 0.7% of the population is Native American/Other. Buchanan County ranks 13th statewide in terms of Native American/Other residents as a share of the population, out of 115 counties.

Since the 2020 Census, Buchanan County's Native American/Other population has declined by an estimated 36.2%. Native American/Other residents' share of Buchanan County's population has remained roughly unchanged at 0.8%.

Buchanan County is more Native American/Other than neighboring Andrew County (0.1% Native American/Other), Doniphan County (0.4% Native American/Other), Clinton County (0.3% Native American/Other), and DeKalb County (0.4% Native American/Other). Buchanan County is less Native American/Other than neighboring Platte County (0.9% Native American/Other).

Buchanan County's Multiracial Population

4,392 residents of Buchanan County, or 5.3% of the population, identify as Multiracial. The share of Multiracial residents in Buchanan County is comparable to the share in Missouri overall, where 4.8% of the population is Multiracial. Buchanan County ranks 27th statewide in terms of Multiracial residents as a share of the population, out of 115 counties.

Since the 2020 Census, Buchanan County's Multiracial population has declined by an estimated 1.6%. Multiracial residents' share of Buchanan County's population has remained roughly unchanged at 5.3%.

Buchanan County is more Multiracial than neighboring Platte County (5.2% Multiracial), Andrew County (2.7% Multiracial), Doniphan County (5.1% Multiracial), Clinton County (4.2% Multiracial), and DeKalb County (3.1% 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.