_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