2021 estimates
As of the 2022 census estimate, the county had a population of 86,644, and as of 2021 census estimates, its racial and ethnic makeup was 69.4% non-Hispanic white, 3.8% African American, 10.9% Native American, 2% Asian, 0.1% Pacific Islander, 7.7% multiracial, and 7.6% Hispanic or Latino of any race.
The racial makeup of the county was 66.8% White, 3.3% Black or African American, 10.3% American Indian and Alaska Native, 1.8% Asian, 2.9% from some other race, and 14.7% from two or more races. Hispanic or Latino residents of any race comprised 7.6% of the population. The population density was 47.7/km<sup>2</sup>. The 29,694 housing units averaged . The racial makeup of the county was 80.07% White, 3.75% African American, 9.38% Native American, 0.51% Asian, 0.88% from other races, and 5.41% from two or more races. Hispanics or Latinos of any race were 2.50% of the population.
Of the 21,010 households in 2010, 37.40% had children under 18 living with them, 65.90% were married couples living together, 9.80% had a female householder with no husband present, and 20.50% were not families. About 17.70% of all households were made up of individuals, and 6.70% had someone living alone who was 65 or older. The average household size was 2.73, and the average family size was 3.08. As of 2010, the age distribution was 28.10% under 18, 7.90% from 18 to 24, 28.50% from 25 to 44, 25.40% from 45 to 64, and 10.20% who were 65 age or older. The median age was 36 years. For every 100 females, there were 97.70 males. For every 100 females age 18 and over, there were 94.90 males.
As of 2010, the median income for a household in the county was $56,819, and for a family was $62,997. The per capita income for the county was $24,976. About 8.3% of families and 12.1% of the population were below the poverty line, including 18.5% of those under age 18 and 5.8% of those age 65 or over.
Politics
{| class=wikitable
! colspan = 6 | Voter Registration and Party Enrollment as of June 30, 2023
|-
! colspan = 2 | Party
! Number of Voters
! Percentage
|-
|
| Republican
| align = center | 29,885
| align = center | 61.22%
|-
|
| Democratic
| align = center | 11,026
| align = center | 22.60%
|-
|
| Libertarian
| align = center | 415
| align = center | 0.85%
|-
|
| Unaffiliated
| align = center | 7,491
| align = center | 15.35%
|-
! colspan = 2 | Total
! align = center | 48,817
! align = center | 100%
|}
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Communities
Cities
- Bixby (mostly in Tulsa County)
- Broken Arrow (also in Tulsa County)
- Catoosa (mostly in Rogers County)
- Coweta
- Tulsa (mostly in Tulsa County)
- Wagoner (county seat)
Towns
- Fair Oaks (also in Rogers County)
- Okay
- Porter
- Redbird
- Tullahassee
Census-designated places
- Clarksville
- Mallard Bay
- Rocky Point
- Taylor Ferry
- Toppers
- Whitehorn Cove
Other unincorporated places
- Choska
- Gibson
- Neodesha
- Oneta
- Stones Corner
Former community
- New Tulsa, dissolved in 2001, now part of Broken Arrow
Education
School districts (all full K-12) include:
- Bixby Public Schools
- Broken Arrow Public Schools
- Catoosa Public Schools
- Chouteau-Mazie Public Schools
- Coweta Public Schools
- Fort Gibson Public Schools
- Haskell Public Schools
- Inola Public Schools
- Locust Grove Public Schools
- Okay Public Schools
- Porter Consolidated Schools
- Tulsa Public Schools
- Wagoner Public Schools
National Register of Historic Places
thumb|120px| First Presbyterian Church of Coweta thumb|120px| The Cobb Building
These in Wagoner County are listed on the National Register of Historic Places:
- A. J. Mason Building, Tullahassee
- Amos Parkinson House, Wagoner
- Cobb Building, Wagoner
- Collin McKinney House, Wagoner
- First National Bank of Wagoner, Wagoner
- First Presbyterian Church of Coweta, Coweta
- Frederick Parkinson House, Wagoner
- Jamison Cemetery, Okay
- John W. Gibson House, Wagoner
- Koweta Mission Site, Coweta
- Miller-Washington School, Red Bird
- Newport Hotel and Restaurant, Wagoner
- Red Bird City Hall, Red Bird
- Rio Grande Ranch Headquarters Historic District, Okay
- St James Episcopal Church, Wagoner
- Tullahassee Mission Site, Tullahassee
- Van Tuyl Homeplace, Porter
- Wagoner Armory, Wagoner
- Way House, Wagoner
- William McAnally House, Wagoner