How many people live in McClain County, OK?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 48,400 people living in McClain County, OK. That makes McClain County the 20th-most populous county in Oklahoma. It is home to 1.2% of people living in the state.
48.4K
population of McClain County, OK (2024)
1.2%
County share of the Oklahoma population (2024)
About 48,400 people lived in McClain County, OK in 2024.
Population estimates, 2000–2024
What are McClain County, OK’s age demographics?
About 7,700 McClain County residents are aged 65 and older in 2024. That represents 16% of its population. For comparison, the age group represents 17% of Oklahoma’s population and 18% in the US overall.
Another 11,900 McClain County residents, or 24.5% of the population, were children under 18. For comparison, the age group represents 23.7% of Oklahoma’s population and 21.6% in the US overall.
A higher share of McClain County, OK's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are McClain County, OK’s racial and ethnic demographics?
Non-Hispanic white residents make up 75.2% of the McClain County, OK population, higher than the national share of 57.5%. McClain County, OK also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (6.3%) than the US overall (0.72%).
In contrast, McClain County’s non-Hispanic Black or African American population accounts for 1.6%, below the 12.6% nationwide, and the Hispanic population makes up 10.6% of the county, compared with 20% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
McClain County, OK has a higher share of a non-Hispanic white population than Oklahoma as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in McClain County, OK is Newcastle with about 14,700 residents in 2024.
Cities and towns in McClain County, OK ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Newcastle | 14,677 |
| 2. | Blanchard (pt.) | 7,505 |
| 3. | Purcell (pt.) | 6,938 |
| 4. | Goldsby | 3,516 |
| 5. | Dibble | 985 |
| 6. | Washington | 767 |
| 7. | Wayne | 670 |
| 8. | Cole | 652 |
| 9. | Byars | 204 |
| 10. | Rosedale | 68 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
