Below is a list of the current counties in the state of Oklahoma, with a link to the OKGenWeb county research site. If you have family history resources to share for one of these counties, please contact the county coordinator, or the OK State Coordinator.
Current Counties | Territorial Counties | Indian Territories
| County | Formed | Coordinator | Additional Info |
| Adair | 1907 | Available | Cherokee Nation Land; Stilwell is the county seat. |
| Alfalfa | 1907 | Shelley Lynch | Created from Woods County, Oklahoma Territory; Cherokee is the county seat. |
| Atoka | 1907 | Available | Choctaw Nation Land; Atoka is county seat. |
| Beaver | 1907 | Available | Roughly the eastern third of what had been Beaver Co., O.T., earlier; Beaver is the county seat. |
| Beckham | 1907 | Available | Created from Roger Mills and Greer Counties, Oklahoma Territory; Sayre is the county seat. |
| Blaine | 1892 | LaRae Halsey-Brooks | Original County, Oklahoma Territory; Watonga is the county seat. |
| Bryan | 1907 | Linda K. Lewis | Choctaw Nation Land; Durant is the county seat. |
| Caddo | 1901 | Mel Owings | Original Lands, Oklahoma Territory; Anadarko is the county seat. |
| Canadian | 1889 | Available | One of the original seven counties outlined and designated by numbers. Canadian was the Fourth; El Reno is the county seat. |
| Carter | 1907 | Available | Chickasaw Nation Land; Ardmore is the county seat. |
| Cherokee | 1907 | Available | Cherokee Nation Land; Tahlequah is the county seat. |
| Choctaw | 1907 | April Makerney | Choctaw Nation Land; Hugo is the county seat. |
| Cimarron | 1907 | LaRae Halsey-Brooks | Roughly the western third of what had been Beaver County, Oklahoma Territory, earlier designated as No Man's Land; |
| Cleveland | 1889 | Available | One of the original seven counties outlined and designated by numbers. Cleveland was the Second. Oklahoma Territory, Unassigned Lands; Norman is the county seat. |
| Coal | 1907 | Monica O'Neal | Choctaw Nation Land; Coalgate is the county seat. |
| Comanche | 1901 | Available | Kiowa, Comanche, Apache Lands, Oklahoma Territory; Lawton is the county seat. |
| Cotton | 1912 | Available | Created from Comanche County, Oklahoma Territory; Walters is the county seat. |
| Craig | 1907 | Darrel Trissell | Cherokee Nation Land; Vinita is the county seat. |
| Creek | 1907 | Marti Graham | Creek Nation Land; Sapulpa is the county seat. |
| Custer | 1892-96 | Available | Cheyenne, Arapaho Lands; Arapaho is the county seat. Opened April 19, 1892. Named Custer County November 6, 1896. |
| Delaware | 1907 | Available | Cherokee Nation Land; Jay is the county seat. |
| Dewey | 1892 | Available | Original County, Oklahoma Territory; Taloga is the county seat. |
| Ellis | 1907 | Available | Created from Day and Woodward Counties, Oklahoma Territory; Arnett is the county seat. |
| Garfield | 1893 | Available | Cherokee Outlet; Enid is the county seat. |
| Garvin | 1907 | Rebecca Maloney | Chickasaw Nation Land; Pauls Valley is the county seat. |
| Grady | 1907 | Available | Created from Pontotoc & Pickens Counties, Indian Territory and a 5 mile strip along the west border from Caddo and Comanche Counties, Oklahoma Territory; Chickasha is the county seat. |
| Grant | 1893 | Available | Original County, Oklahoma Territory; Medford is the county seat. |
| Greer | 1890 | Available | Originally in the State of Texas; Mangum is the county seat. |
| Harmon | 1909 | Available | Created from Greer and Jackson Counties, Oklahoma Territory; Hollis is the county seat. |
| Harper | 1907 | Available | Indian Lands, Woods and Woodward Counties; Buffalo is the county seat. |
| Haskell | 1908 | Available | Choctaw Nation Land; Stigler is the county seat. |
| Hughes | 1907 | Available | Creek Nation Land; Holdenville is the county seat. |
| Jackson | 1907 | Pam Miller | Created from Greer County, Oklahoma Territory; Altus is the county seat. |
| Jefferson | 1907 | Available | Created from Comanche County, Oklahoma Territory; Waurika is the county seat. |
| Johnston | 1907 | Available | Chickasaw Nation Land; Tishomingo is the county seat. |
| Kay | 1895 | Available | Original County, Oklahoma Territory; Newkirk is the county seat. |
| Kingfisher | 1890 | LaRae Halsey-Brooks | One of the original seven counties outlined and designated by numbers. Kingfisher was the Fifth; Kingfisher is the county seat. |
| Kiowa | 1901 | Christine Sharbrough | Original County, Oklahoma Territory; Hobart is the county seat. |
| Latimer | 1902 | Available | Choctaw Nation Land; Wilburton is the county seat. |
| LeFlore | 1907 | Marti Graham | Choctaw Nation Land; Poteau is the county seat. |
| Lincoln | 1891 | Rebecca Maloney | Original County, Oklahoma Territory; Chandler is the county seat. |
| Logan | 1890 | Available | One of the original seven counties outlined and designated by numbers, Logan was the First; Oklahoma Territory; Guthrie is the county seat. |
| Love | 1907 | Available | Chickasaw Nation Land; Marietta is the county seat. |
| Major | 1907 | Available | Created from Woods County; Fairview is the county seat. |
| Marshall | 1907 | Available | Chickasaw Nation Land; Madill is the county seat. |
| Mayes | 1907 | Available | Cherokee Nation Land; Pryor is the county seat. |
| McClain | 1907 | Available | Chickasaw Nation Land; Purcell is the county seat. |
| McCurtain | 1907 | Available | Choctaw Nation Land; Idabel is the county seat. |
| McIntosh | 1907 | Shelley Lynch | Creek Nation Land; Eufaula is the county seat. |
| Murray | 1907 | Rebecca Maloney | Chickasaw Nation Land; Sulphur is the county seat. |
| Muskogee | 1898 | Sue Tolbert | Creek Nation Land; Muskogee is the county seat. |
| Noble | 1893 | Available | Cherokee Outlet; Perry is the county seat. |
| Nowata | 1907 | Available | Cherokee Nation Land; Nowata is the county seat. |
| Okfuskee | 1907 | Available | Creek Nation Land; Okemah is the county seat. |
| Oklahoma | 1890 | Marti Graham | One of the original seven counties outlined and designated by numbers. Oklahoma was the Third; Oklahoma City is the county seat. |
| Okmulgee | 1907 | Available | Creek Nation Land; Okmulgee is the county seat. |
| Osage | 1907 | Available | Osage Nation Land; Pawhuska is the county seat. |
| Ottawa | 1907 | Available | Cherokee Nation Land; Miami is the county seat. |
| Pawnee | 1893 | Available | Cherokee Outlet; Pawnee is the county seat. |
| Payne | 1890 | Candace Frits | One of the original seven counties outlined and designated by numbers. Payne was the Sixth. Unassigned Lands, Oklahoma Territory; Stillwater is the county seat. |
| Pittsburg | 1907 | Available | McAlester is the county seat. Prior to statehood (November 16, 1907), Tobucksy County, Moshulatubbee District, Choctaw Nation, Indian Territory. |
| Pontotoc | 1907 | Available | Chickasaw Nation Land; Ada is the county seat. |
| Pottawatomie | 1891 | Available | Original County, Oklahoma Territory; Shawnee is the county seat. |
| Pushmataha | 1907 | Available | Choctaw Nation Land; Antlers is the county seat. |
| Roger Mills | 1892 | Judy Tracy | Cheyenne, Arapaho Lands; Cheyenne is the county seat. |
| Rogers | 1907 | Available | Cherokee Nation Land; Claremore is the county seat. |
| Seminole | 1907 | Linda Simpson | Seminole Indian Land; Wewoka is the county seat. |
| Sequoyah | 1907 | Available | Cherokee Nation Land; Sallisaw is the county seat. |
| Stephens | 1907 | Available | Comanche County, Oklahoma Territory and Chickasaw Nation Land; Duncan is the county seat. |
| Texas | 1907 | LaRae Halsey-Brooks | Roughly the eastern third of what had been Beaver County, Oklahoma Territory, earlier designated as No Man's Land; Guymon is the county seat. |
| Tillman | 1907 | Available | Comanche Indian Land; Frederick is the county seat. |
| Tulsa | 1905 | Available | Creek Nation Land; Tulsa is the county seat. |
| Wagoner | 1908 | Available | Creek Nation Land; Wagoner is the county seat. |
| Washington | 1897 | Available | Cherokee Nation Land; Bartlesville is the county seat. |
| Washita | 1900 | Available | Cheyenne, Arapaho Lands; Cordell is the county seat. |
| Woods | 1893 | Available | Cherokee Outlet; Alva is the county seat. |
| Woodward | 1893 | Available | Cherokee Outlet; Woodward is the county seat. |
Page updated:
State Coordinator: Linda K. Lewis
Asst State Coordinator: Rebecca Maloney
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