County	Founded	Parent	County Seat
A		Original designation for Lincoln County, Oklahoma Territory
Adair	1907	Cherokee Nation Land	Stilwell
Alfalfa	1907	Woods	Cherokee
Atoka	1907	Choctaw Nation Land	Atoka
B		Original designation for Pottawatomie County, Oklahoma Territory
Beaver	1890	Original County	Beaver
Beckham	1907	Roger Mills and Greer	Sayre
Blaine	1892	Original County	Watonga
Bryan	1907	Choctaw Nation Land	Durant
C		Original designation for Blaine County, Oklahoma Territory
Caddo	1901	Original Lands	Anadarko
Canadian	1889	Original County	El Reno
Carter	1907	Chickasaw Nation Land	Ardmore
Cherokee	1907	Cherokee Nation Land	Tahlequah
Choctaw	1907	Choctaw Nation Land	Hugo
Cimarron	1907	Beaver	Boise City
Cleveland	1889	Unassigned Lands	Norman
Coal	1907	Choctaw Nation Land	Coalgate
Comanche	1901	Kiowa, Comanche, Apache Lands	Lawton
Cotton	1912	Comanche County	Walters
Craig	1907	Cherokee Nation Land	Vinita
Creek	1907	Creek Nation Land	Sapulpa
Custer	1890-08	Cheyenne, Arapaho Lands	Arapaho
D		D County was the original designation for Dewey County, Oklahoma Territory
Day		Day County: A county in Oklahoma Territory, abolished at statehood, comprising the northern portion of Roger Mills County and the southern portion of Ellis County. Named for William R. Day
Delaware	1907	Cherokee Nation Land	Jay
Dewey	1892	Original County	Taloga
E		Original designation for Day County, Oklahoma Territory
Ellis	1907	Day and Woodward Counties	Arnett
F		Original designation for Roger Mills County, Oklahoma Territory.
G		Original designation for Custer County, Oklahoma Territory.
Garfield	1893	Cherokee Outlet	Enid
Garvin	1907	Chickasaw Nation Land	PaulsValley
Grady	1907	Caddo, Comanche	Chickasha
Grant	1893	Original County	Medford
Greer	1890	State of Texas	Mangum
H		Original designation for Washita County, Oklahoma Territory.
Harmon	1909	Greer and Jackson Counties	Hollis
Harper	1907	Indian Lands, Woods, Woodward	Buffalo
Haskell	1908	Choctaw Nation Land	Stigler
Hughes	1907	Creek Nation Land	Holdenville
I		Original designation for Caddo County, Oklahoma Territory
Jackson	1907	Greer County, Oklahoma Territory	Altus
Jefferson	1907	Comanche County	Waurika
Johnston	1907	Chickasaw Nation Land	Tishomingo
K		Original designation for Kay County, Oklahoma Territory
Kay	1895	Original County	Newkirk
Kingfisher	1890	Original County	Kingfisher
Kiowa	1901	Original County	Hobart
L		Original designation for Grant County, Oklahoma Territory
Latimer	1902	Choctaw Nation Land	Wilburton
LeFlore	1907	Choctaw Nation Land	Poteau
Lincoln	1891	Original County	Chandler
Logan	1890	Original County	Guthrie
Love	1907	Chickasaw Nation Land	Marietta
M		Original designation for Woods County, Oklahoma Territory
Major	1907	Woods County	Fairview
Marshall	1907	Chickasaw Nation Land	Madill
Mayes	1907	Cherokee Nation Land	Pryor
McClain	1907	Chickasaw Nation Land	Purcell
McCurtain	1907	Choctaw Nation Land	Idabel
McIntosh	1907	Creek Nation Land	Eufaula
Murray	1907	Chickasaw Nation Land	Sulphur
Muskogee	1898	Creek Nation Land	Muskogee
N		Original designation for Woodward County, Oklahoma Territory
Noble	1893	Cherokee Outlet	Perry
Nowata	1907	Cherokee Nation Land	Nowata
O		Original designation for Garfield County, Oklahoma Territory
Okfuskee	1907	Creek Nation Land	Okemah
Oklahoma	1890	Original County	Oklahoma City
Okmulgee	1907	Creek Nation Land	Okmulgee
Osage	1907	Osage Nation Land	Pawhuska
Ottawa	1907	Cherokee Nation Land	Miami
P		Original designation for Noble County, Oklahoma Territory
Pawnee	1893	Cherokee Outlet	Pawnee
Payne	1890	Original County	Stillwater
Payne County, Oklahoma Resources
Pittsburg	1907	Choctaw Nation Land	McAlester
Pontotoc	1907	Chickasaw Nation Land	Ada
Pottawatomie	1891	Original County	Shawnee
Pushmataha	1907	Choctaw Nation Land	Antlers
Q		Original designation for Pawnee County, Oklahoma Territory
Roger Mills	1892	Cheyenne, Arapaho Lands	Cheyenne
Rogers	1907	Cherokee Nation Land	Claremore
Seminole	1907	Seminole Indian Land	Wewoka
Sequoyah	1907	Cherokee Nation Land	Sallisaw
Stephens	1907	Comanche County and Chickasaw Nation	Duncan
Texas	1907	Beaver	Guymon
Tillman	1907	Comanche Indian Land	Frederick
Tulsa	1905	Creek Nation Land	Tulsa
Wagoner	1908	Creek Nation Land	Wagoner
Washington	1897	Cherokee Nation Land	Bartlesville
Washita	1900	Cheyenne, Arapaho Lands	Cordell
Woods	1893	Cherokee Outlet	Alva
Woodward	1893	Cherokee Outlet	Woodward

INDIAN TERRITORY

Cherokee Nation

Cherokee Archival Project

Chickasaw Nation

Choctaw Nation

Creek Nation

Seminole Nation

Civil War in Indian Territory Site 1 Civil War in Indian Territory Site 2

Cherokee Outlet

Cheyenne & Arapaho

Greer County (pre-statehood)

Freedmen

Kansas/Kanza/Kaw

Kiowa, Comanche & Apache

No Man's Land

Osage Nation

Ponca Agency (off line) Pawnee, Poncas, Otoes and Missouria, Tonkawa

Quapaw Agency Lands     Quapaw, Modoc, Ottawa, Peoria,      Seneca, Shawnee, Wyandotte

Sac and Fox Agency     Sac and Fox, Kickapoo, Iowa, Shawnee, Potawatomi

Unassigned Lands

Wichita & Caddo Tribe