ORGANIZATION OF THE COUNTIES OF KANSAS
Counties Organized Before 1860
 County. Date of Organization. County Seat. 
Allen 1855 Iola.
Anderson 1855 Garnett.
Atchison 1855 Atchison.
Bourbon 1855 Fort Scott.
Brown 1855 Hiawatha.
Butler 1855 El Dorado.
Chase 1859 Cottonwood Falls.
Coffey 1859 Burlington.
Dickinson 1857 Abilene.
Doniphan 1855 Troy.
Douglas 1855 Lawrence.
Franklin 1855 Ottawa.
Geary[24] 1855 Junction City.
Jackson[25] 1857 Holton.
Jefferson 1855 Oskaloosa.
Johnson 1855 Olathe.
Leavenworth 1855 Leavenworth.
Linn 1855 Mound City.
Marshall 1855 Marysville.
Miami[26] 1855 Paola.
Morris[27] 1855 Council Grove.
Nemaha 1855 Seneca.
Osage[28] 1855 Lyndon.
Pottawatomie 1856 Westmoreland.
Riley 1855 Manhattan.
Saline 1859 Salina.
Shawnee 1855 Topeka.
Wabaunsee[29] 1859 Alma.
Woodson 1855 Yates Center.
Wyandotte 1855 Kansas City.

Counties Organized 1860-1870
Cherokee 1866 Columbus.
Clay 1866 Clay Center.
Cloud[30] 1860 Concordia.
Crawford 1867 Girard.
Ellis 1867 Hays.
Ellsworth 1867 Ellsworth.
Greenwood 1862 Eureka.
Labette[31] 1867 Oswego.
Lyon[32] 1860 Emporia.
Marion 1860 Marion.
Montgomery 1869 Independence.
Neosho[33] 1864 Erie.
Ottawa 1866 Minneapolis.
Republic 1868 Belleville.
Washington 1860 Washington.
Wilson 1865 Fredonia.

Counties Organized 1870-1880
Barber 1873 Medicine Lodge.
Barton 1872 Great Bend.
Chautauqua 1875 Sedan.
Cowley[34] 1870 Winfield.
Decatur 1879 Oberlin.
Edwards 1874 Kinsley.
Elk[35] 1875 Howard.
Ford 1873 Dodge City.
Harper[36] 1878 Anthony.
Harvey 1872 Newton.
Hodgeman 1879 Jetmore.
Jewell 1870 Mankato.
Kingman 1874 Kingman.
Lincoln 1870 Lincoln.
McPherson 1870 McPherson.
Mitchell 1870 Beloit.
Norton 1872 Norton.
Osborne 1871 Osborne.
Pawnee 1872 Larned.
Phillips 1872 Phillipsburg.
Pratt[36] 1879 Pratt.
Reno 1872 Hutchinson.
Rice 1871 Lyons.
Rooks 1872 Stockton.
Rush 1874 La Crosse.
Russell 1872 Russell.
Sedgwick 1870 Wichita.
Smith 1872 Smith Center.
Stafford 1879 St. John.
Sumner 1871 Wellington.
Trego 1879 WaKeeney.

Counties Organized 1880-1890
Cheyenne 1886 St. Francis.
Clark 1885 Ashland.
Comanche[37] 1885 Coldwater.
Finney[38] 1884 Garden City.
Gove 1886 Gove.
Graham 1880 Hill City.
Gran 1888 Ulysses.
Gray 1887 Cimarron.
Greeley 1887 Tribune.
Hamilton 1886 Syracuse.
Haskell 1887 Santa Fe.
Kearny 1888 Lakin.
Kiowa 1886 Greensburg.
Lane 1886 Dighton.
Logan 1887 Russell Springs.
Meade 1885 Meade.
Morton 1886 Richfield.
Ness[37] 1880 Ness City.
Rawlins 1881 Atwood.
Scott 1886 Scott.
Seward 1886 Liberal.
Sheridan 1880 Hoxie.
Sherman 1886 Goodland.
Stanton 1887 Johnson.
Stevens 1886 Hugoton.
Thomas 1885 Colby.
Wichita 1886 Leoti.
Wallace 1888 Sharon Springs.