McClain County Demographics

A map of McClain County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	34,150	30,701	75.4%	73.7%
Hispanic	4,414	3,699	9.7%	8.9%
Multiracial	3,272	3,918	7.2%	9.4%
Native American/Other	2,618	2,789	5.8%	6.7%
Black	550	346	1.2%	0.8%
Asian	269	209	0.6%	0.5%

McClain County, Oklahoma has an estimated population of 45,273, an increase from the 41,662 recorded in the 2020 Census. The population is 75.4% White, 9.7% Hispanic, 7.2% Multiracial, 5.8% Native American/Other, 1.2% Black, and 0.6% Asian. This demographic dot map shows the population of McClain County, with one dot drawn for each person counted by the Census, color-coded by race.

McClain has become less racially diverse since the 2020 Census. It is considerably less diverse than Oklahoma overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In McClain County, that probability was 43.6% in 2020 and 41.3% in the most recent ACS estimates.

McClain County is ranked the 21st most populous county in Oklahoma, out of 77 counties. McClain County was ranked the 24th most populous county in the 2020 Census.

McClain County's White Population

34,150 residents of McClain County, or 75.4% of the population, identify as White. The share of White residents in McClain County is considerably higher than in Oklahoma overall, where 62.1% of the population is White. McClain County ranks 18th statewide in terms of White residents as a share of the population, out of 77 counties.

Since the 2020 Census, McClain County's White population has grown by an estimated 11.2%. White residents' share of McClain County's population has increased from 73.7% to 75.4%.

McClain County is more White than neighboring Cleveland County (67.2% White), Garvin County (71.9% White), Pottawatomie County (69.6% White), and Oklahoma County (52.1% White). McClain County is less White than neighboring Grady County (78.7% White).

McClain County's Black Population

550 residents of McClain County, or 1.2% of the population, identify as Black. The share of Black residents in McClain County is lower than in Oklahoma overall, where 6.8% of the population is Black. McClain County ranks 60th statewide in terms of Black residents as a share of the population, out of 77 counties.

Since the 2020 Census, McClain County's Black population has grown by an estimated 59.0%. Black residents' share of McClain County's population has remained roughly unchanged at 1.2%.

McClain County is less Black than neighboring Cleveland County (4.6% Black), Garvin County (1.3% Black), Grady County (1.8% Black), Pottawatomie County (2.9% Black), and Oklahoma County (14% Black).

McClain County's Asian Population

269 residents of McClain County, or 0.6% of the population, identify as Asian. The share of Asian residents in McClain County is comparable to the share in Oklahoma overall, where 2.4% of the population is Asian. McClain County ranks 40th statewide in terms of Asian residents as a share of the population, out of 77 counties.

Since the 2020 Census, McClain County's Asian population has grown by an estimated 28.7%. Asian residents' share of McClain County's population has remained roughly unchanged at 0.6%.

McClain County is more Asian than neighboring Grady County (0.5% Asian). McClain County is less Asian than neighboring Cleveland County (4.7% Asian), Pottawatomie County (1% Asian), and Oklahoma County (3.4% Asian).

McClain County's Hispanic Population

4,414 residents of McClain County, or 9.7% of the population, identify as Hispanic. The share of Hispanic residents in McClain County is slightly lower than in Oklahoma overall, where 12.7% of the population is Hispanic. McClain County ranks 29th statewide in terms of Hispanic residents as a share of the population, out of 77 counties.

Since the 2020 Census, McClain County's Hispanic population has grown by an estimated 19.3%. Hispanic residents' share of McClain County's population has increased from 8.9% to 9.7%.

McClain County is more Hispanic than neighboring Grady County (7.1% Hispanic), and Pottawatomie County (6.4% Hispanic). McClain County is less Hispanic than neighboring Cleveland County (11% Hispanic), Garvin County (10.4% Hispanic), and Oklahoma County (20.1% Hispanic).

McClain County's Native American/Other Population

2,618 residents of McClain County, or 5.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in McClain County is comparable to the share in Oklahoma overall, where 7.1% of the population is Native American/Other. McClain County ranks 45th statewide in terms of Native American/Other residents as a share of the population, out of 77 counties.

Since the 2020 Census, McClain County's Native American/Other population has declined by an estimated 6.1%. Native American/Other residents' share of McClain County's population has decreased from 6.7% to 5.8%.

McClain County is more Native American/Other than neighboring Cleveland County (3.7% Native American/Other), Garvin County (4.2% Native American/Other), Grady County (3.6% Native American/Other), and Oklahoma County (2.6% Native American/Other). McClain County is less Native American/Other than neighboring Pottawatomie County (11.2% Native American/Other).

McClain County's Multiracial Population

3,272 residents of McClain County, or 7.2% of the population, identify as Multiracial. The share of Multiracial residents in McClain County is comparable to the share in Oklahoma overall, where 8.9% of the population is Multiracial. McClain County ranks 35th statewide in terms of Multiracial residents as a share of the population, out of 77 counties.

Since the 2020 Census, McClain County's Multiracial population has declined by an estimated 16.5%. Multiracial residents' share of McClain County's population has decreased from 9.4% to 7.2%.

McClain County is less Multiracial than neighboring Cleveland County (8.8% Multiracial), Garvin County (11.5% Multiracial), Grady County (8.2% Multiracial), Pottawatomie County (9.1% Multiracial), and Oklahoma County (7.8% 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.