| ID | County Seat | Date County Created | Former County Name | Former County Seat |
| AL Allen | Iola | 1855 | original | |
| AN Anderson | Garnett | 1855 | original | |
| AT Atchison | Atchison | 1855 | original | |
| BA Barber | Medicine Lodge | 1867 | Harper | |
| BT Barton | Great Bend | 1867 | Ellsworth | |
| BB Bourbon | Fort Scott | 1855 | original | |
| BR Brown | Hiawatha | 1855 | original | |
| BU Butler | El Dorado | 1855 | Irving | Towanda |
| CS Chase | Cottonwood Falls | 1859 | Butler | |
| CQ Chautauqua | Sedan | 1875 | Howard | Elk Falls, Boston |
| CK Cherokee | Columbus | 1855 | McGee | |
| CN Cheyenne | St. Francis | 1875 | ||
| CA Clark | Ashland | 1885 | Ford | |
| CY Clay | Clay Center | 1857 | original | |
| CD Cloud | Concordia | 1860 | Shirley | |
| CF Coffey | Burlington | 1855 | original | |
| CM Comanche | Coldwater | 1867 | Kiowa | |
| CL Cowley | Winfield | 1867 | Hunter | |
| CR Crawford | Girard | 1867 | Bourbon | |
| DC Decatur | Oberlin | 1873 | Norton | |
| DK Dickinson | Abilene | 1855 | original | |
| DP Doniphan | Troy | 1855 | original | |
| DG Douglas | Lawrence | 1855 | original | |
| ED Edwards | Kinsley | 1874 | Kiowa | |
| EK Elk | Howard | 1875 | Howard | Elk Falls, Boston |
| EL Ellis | Hays | 1867 | ||
| EW Ellsworth | Ellsworth | 1867 | Saline | |
| FI Finney | Garden City | 1883 | Sequoyah | |
| FO Ford | Dodge City | 1873 | ||
| FR Franklin | Ottawa | 1855 | original | Ohio City |
| GE Geary | Junction City | 1855 | Davis | |
| GO Gove | Gove | 1868 | ||
| GH Graham | Hill City | 1867 | Rooks | |
| GT Grant | Ulysses | 1873 | ||
| GY Gray | Cimarron | 1887 | ||
| GL Greeley | Tribune | 1873 | Hamilton | |
| GW Greenwood | Eureka | 1855 | Madison | Columbia |
| HM Hamilton | Syracuse | 1873 | ||
| HP Harper | Anthony | 1867 | Kingman | |
| HV Harvey | Newton | 1872 | ||
| HS Haskell | Sublette | 1887 | Finney | |
| HG Hodgeman | Jetmore | 1879 | ||
| JA Jackson | Holton | 1855 | Calhoun | |
| JF Jefferson | Oskaloosa | 1855 | original | |
| JW Jewell | Mankato | 1867 | Mitchell | |
| JO Johnson | Olathe | 1855 | original | |
| KE Kearny | Lakin | 1873 | Finney | |
| KM Kingman | Kingman | 1886 | ||
| KW Kiowa | Greensburg | 1886 | ||
| LB Labette | Oswego | 1867 | Neosho | |
| LE Lane | Dighton | 1877 | Finney | |
| LV Leavenworth | Leavenworth | 1855 | original | |
| LC Lincoln | Lincoln | 1867 | Ellsworth | |
| LN Linn | Mound City | 1855 | original | |
| LG Logan | Oakley | 1881 | St. John | |
| LY Lyon | Emporia | 1857 | Breckenridge | |
| MN Marion | Marion | 1855 | Chase | |
| MS Marshall | Marysville | 1855 | original | |
| MP McPherson | McPherson | 1867 | ||
| ME Meade | Meade | 1885 | ||
| MI Miami | Paola | 1855 | Lykins | |
| MC Mitchell | Beloit | 1867 | ||
| MG Montgomery | Independence | 1867 | Labette | |
| MR Morris | Council Grove | 1855 | Wise | |
| MT Morton | Elkhart | 1881 | Stanton | |
| NM Nemaha | Seneca | 1855 | original | |
| NO Neosho | Erie | 1855 | Dorn | |
| NS Ness | Ness City | 1867 | Hodgeman | |
| NT Norton | Norton | 1867 | Billings | |
| OS Osage | Lyndon | 1855 | Weller | |
| OB Osborne | Osborne | 1867 | Mitchell | |
| OT Ottawa | Minneapolis | 1860 | Saline | |
| PN Pawnee | Larned | 1867 | ||
| PL Phillips | Phillipsburg | 1867 | ||
| PT Pottawatomie | Westmoreland | 1857 | ||
| PR Pratt | Pratt | 1867 | Stafford | |
| RA Rawlins | Atwood | 1873 | ||
| RN Reno | Hutchinson | 1867 | ||
| RP Republic | Belleville | 1860 | ||
| RC Rice | Lyons | 1867 | Peketon | Beach Valley |
| RL Riley | Manhattan | 1855 | ||
| RO Rooks | Stockton | 1867 | ||
| RH Rush | La Crosse | 1867 | ||
| RS Russell | Russell | 1867 | Ellsworth | |
| SA Saline | Salina | 1860 | original | |
| SC Scott | Scott City | 1873 | Finney | |
| SG Sedgwick | Wichita | 1867 | Butler | |
| SW Seward | Liberal | 1855 | Godfrey | |
| SN Shawnee | Topeka | 1855 | original | |
| SD Sheridan | Hoxie | 1873 | ||
| SH Sherman | Goodland | 1873 | ||
| SM Smith | Smith Center | 1867 | ||
| SF Stafford | St. John | 1867 | ||
| ST Stanton | Johnson | 1873 | ||
| SV Stevens | Hugoton | 1873 | ||
| SU Sumner | Wellington | 1867 | Cowley | |
| TH Thomas | Colby | 1873 | ||
| TR Trego | WaKeeney | 1867 | Ellis | |
| WB Wabaunsee | Alma | 1855 | Richardson | |
| WA Wallace | Sharon Springs | 1868 | ||
| WS Washington | Washington | 1855 | original | |
| WH Wichita | Leoti | 1873 | ||
| WL Wilson | Fredonia | 1855 | original | |
| WO Woodson | Yates Center | 1855 | original | |
| WY Wyandotte | Kansas City | 1859 | original | |
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