McClain County's 2026 population is estimated at 51,182, reflecting a 2.76% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). McClain County is the 17th largest county in Oklahoma. The 2010 population was 34,737 and has grown 47.34% since 2010.
Data after 2023 is projected based on recent change
Overall: 38.6 years
Female: 38.8 years
Male: 38.5 years
There are 33,916 adults, (7,054 of whom are seniors) in McClain County.
Female: 22,677 (50.1%)
Male: 22,596 (49.9%)
The racial composition of McClain County includes 77.73% White, 5.74% Native American, and smaller percentages for other race, Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 35,192 | 77.73% |
| Two or more races | 5,908 | 13.05% |
| Native American | 2,597 | 5.74% |
| Other race | 755 | 1.67% |
| Black or African American | 550 | 1.21% |
| Asian | 269 | 0.59% |
| Native Hawaiian or Pacific Islander | 2 | 0% |
McClain County 's average per capita income is $54,019. Household income levels show a median of $84,552. The poverty rate stands at 8.52%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $110,524 | $130,812 |
| Families | $98,946 | $122,104 |
| Households | $84,552 | $106,677 |
| Non Families | $40,812 | $56,857 |
Average Income
Median Household Income
Poverty Rate
