McClain County: Demographics & People
About 45,273 people live in McClain County, in 16,421 households. Median age 38.6 years. (3.4y older than Oklahoma). Population is 10% Hispanic or Latino and 1% Black. County is gaining 3,029 residents per year (2022-2023). County health: 40% adult obesity, 17% smoke.
- 2.8 people per household (vs Oklahoma avg 2.6).
- 69 dependents per 100 working-age (youth + seniors / 18-64) (vs Oklahoma 67).
Population & Trend
Current population 45,273; figures track the most recent Census ACS 5-year estimates.
| Population | 45,273 people (vs Oklahoma 63,420) |
|---|---|
| Total Town Population | 16,713 people |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-29
Age Distribution
Median age 38.6y is 0.3 years younger than the U.S. median (38.9y).
| Age Summary · Total Pop | 45,273 |
|---|---|
| Age Summary · Under 18 | 11,357 |
| Age Summary · 18 To 34 | 8,871.0× |
| Age Summary · 35 To 64 | 17,991.0× |
| Age Summary · 65 Plus | 7,054 |
| Age Summary · Pct Under 18 | 25.1% |
| Age Summary · Pct 18 To 34 | 19.6% |
| Age Summary · Pct 35 To 64 | 39.7% |
| Median age | 38.6 years (vs Oklahoma 35.2y) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 45,273 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 45,273 people |
|---|---|
| White residents | 35,192 |
| Black residents | 550 |
| Asian residents | 269 |
| Census Demographics · Aian | 2,597 |
| Census Demographics · Nhpi | 2 |
| Census Demographics · Other Race | 755 |
| Census Demographics · Two Or More Races | 5,908 |
| Diversity Index | 37.5% |
| Asian population | 0.6% (vs Oklahoma 3.2%) |
| Black population | 1.2% (vs Oklahoma 5.5%) |
| Hispanic or Latino population | 9.8% (vs Oklahoma 12.3%) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-29
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 11.0% are foreign-born — below the U.S. average of 13.9%.
| Census Citizenship · Total | 45,273 |
|---|---|
| Census Citizenship · Native | 43,691 |
| Residents born in this state | 31,719 |
| Residents born in another state | 11,640 |
| Census Citizenship · Foreign Born | 4,973 |
| Census Citizenship · Naturalized | 2,907 |
| Census Citizenship · Non Citizen | 332 |
| Foreign-born residents | 11.0% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-29
Households & Family Composition
16,421 households.
| Family households | 12,146 households (vs Oklahoma 16,590) |
|---|---|
| Total households | 16,421 households (vs Oklahoma 23,671) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-29
Residential Stability & Migration
How long residents have lived here and where they came from. The surrounding county is gaining 3,029 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 47,565 |
|---|---|
| Migration · People moving out (annual) | 44,536 |
| Migration · Net migration (in − out) | 3,029 |
| Migration · Population growing | Yes |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2022-2023
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Census Disability · Total Pop | 44,881 |
|---|---|
| With Disability | 6,690 |
| Pct With Disability | 14.9% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-29
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 0 residents live in group quarters.
| Census Group Quarters · Total | 300 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-29
Other
| Census Mobility · Total | 44,877 |
|---|---|
| Census Mobility · Same House | 40,042 |
| Census Mobility · Same County | 1,606 |
| Census Mobility · Diff County Same State | 2,538 |
| Census Mobility · Diff State | 476 |
| Census Mobility · From Abroad | 215 |
| Census Mobility · Moved Total | 4,835 |
| Census Mobility · Pct Moved In Year | 10.8% |
| Pct White | 77.7% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-29