McClain County, Oklahoma Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 21st-largest in Oklahoma
The population of McClain County, Oklahoma is 43,779 as of the 2023 American Community Survey, making it the 21st-largest county in Oklahoma. The median household income is $84,778, the median home value is $233,900, and the median age is 38.9.
The population of McClain County has grown 39.4% since 2010 (34,737 → 48,434), a +2.40% annualized rate.
43,779
Population
+2.40%
Annual growth
77
People / sq mi
$84,778
Median Income
$233,900
Median Home Value
McClain County covers 571 sq mi of land at 76.7 people per square mile.
About McClain County, OK
What sets McClain County apart is money: median household income runs $84,778, above the US median of $78,538. With 43,779 residents, McClain County is a county in Oklahoma. It ranks #21 among counties in Oklahoma by population.
Households take in a median $84,778, comfortably above the US median of $78,538. The poverty rate, 6.3%, is on the lower side for US counties and below the national 12.4%. A typical home is worth $233,900, with typical rent around $964.
College attainment is above the local norm at 28.0%, below the national 35.0%. About 9.3% of the workforce is home-based, below the national 14.0%, and the average commute runs about 29 minutes each way.
Taken together, the income and housing figures place McClain County firmly in the higher-cost, higher-earning tier of US counties — a profile that tends to track dense job markets and competitive housing.
McClain County Population History (2010-2024)
The county of McClain County had a population of 34,737 in 2010 and 48,434 in 2024, a 39.4% growth over 14 years. The peak was 48,434 in 2024. Average annual growth rate: 2.41%.
48,434
Population (2024)
34,737
Population (2010)
48,434
Peak (2024)
2.41%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 34,737 |
| 2011 | 35,199 |
| 2012 | 35,583 |
| 2013 | 36,459 |
| 2014 | 37,248 |
| 2015 | 37,981 |
| 2016 | 38,625 |
| 2017 | 39,310 |
| 2018 | 39,855 |
| 2019 | 40,466 |
| 2020 | 41,910 |
| 2021 | 43,538 |
| 2022 | 45,422 |
| 2023 | 47,060 |
| 2024 | 48,434 |
Race & Ethnicity
| White | 79.5% |
| Black or African American | 1.1% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 11.2% |
| Two or More Races | 0.0% |
Age & Sex
38.9
Median Age
50.1%
Female
49.9%
Male
15.5%
Age 65+
Age Distribution
Children (under 15): 20.5% · Seniors (65+): 15.5%
Income & Poverty
| Median household income | $84,778+$21,175 vs state |
| Mean household income | $103,428 |
| Per-capita income | $39,352 |
| Poverty rate | 6.3%-4.8% vs state |
| Unemployment rate | 3.0% |
| Employment-to-population | 60.5% |
Top Industries by Employment
The largest employment sector in McClain County is professional & business services, accounting for 23.8% of workers.
How residents commute
0.1%
Drive alone
1.0%
Carpool
82.2%
Public transit
9.3%
Work from home
28.8 min
Avg commute
Housing
$233,900+$48,000 vs state
Median home value
$964
Median rent
78.5%
Homeownership rate
17,125
Total housing units
93.6%
Occupied
6.4%
Vacant
21.5%
Renter-occupied
Social & access
90.2%
With health insurance
95.3%
With broadband internet
26.6%
Foreign-born
8.2%
Veterans (18+)
14.5%
With a disability
93.2%
Speak language other than English at home
Education
88.6%
High School+
28.0%
Bachelor's+
Largest cities in Oklahoma
Other counties in Oklahoma
Part of Oklahoma
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County rankings
Frequently Asked Questions
McClain County, Oklahoma has a population of 43,779 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 21st-largest county in Oklahoma. Population density is 77 people per square mile.
The population of McClain County has grown 39.4% since 2010 (34,737 → 48,434), a +2.40% annualized rate.
The median household income in McClain County, Oklahoma is $84,778, with mean (average) household income of $103,428 and per-capita income of $39,352. 6.3% of residents live below the federal poverty level.
In McClain County, the largest racial and ethnic groups are White (79.5%), Hispanic or Latino (11.2%), Black or African American (1.1%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in McClain County, Oklahoma is 38.9 years. Residents are 50.1% female and 49.9% male.
The median home value in McClain County is $233,900 and median monthly rent is $964. 78.5% of occupied housing units are owner-occupied. The county has 17,125 total housing units, 6.4% of which are vacant.
The largest employment sector in McClain County, Oklahoma is professional, scientific, and management services, employing 23.8% of workers. The unemployment rate is 3.0%.
Oklahoma City is among the largest cities associated with McClain County, Oklahoma, with a population of 688,693.
McClain County, OK Climate
McClain County, OK has an average annual temperature of 16°C (61°F) and receives about 927 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
16°C
Avg Temp
927
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 3° / 37° | 33 mm |
| February | 6° / 43° | 48 mm |
| March | 11° / 52° | 77 mm |
| April | 16° / 61° | 87 mm |
| May | 21° / 69° | 136 mm |
| June | 25° / 77° | 106 mm |
| July | 28° / 82° | 66 mm |
| August | 27° / 81° | 66 mm |
| September | 23° / 74° | 108 mm |
| October | 17° / 63° | 94 mm |
| November | 10° / 50° | 62 mm |
| December | 5° / 41° | 44 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit McClain County, OK
The most comfortable months to visit McClain County, OK are typically May, September and October, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 34°C high). The coldest is January (near -3°C low). May is usually the wettest month.
Where to stay near McClain County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.