| County | FIPS Code | County Seat | Established in | County Code | Population | Area (sq mi) | Area (km2) |
|---|---|---|---|---|---|---|---|
| Allen County | 1 | Iola | 1855 | AL | 13,319 | 503 | 1,303 |
| Anderson County | 3 | Garnett | 1855 | AN | 7,917 | 583 | 1,510 |
| Atchison County | 5 | Atchison | 1855 | AT | 16,813 | 432 | 1,119 |
| Barber County | 7 | Medicine Lodge | 1867 | BA | 4,861 | 1,134 | 2,937 |
| Barton County | 9 | Great Bend | 1867 | BT | 27,557 | 894 | 2,315 |
| Bourbon County | 11 | Fort Scott | 1855 | BB | 14,897 | 637 | 1,650 |
| Brown County | 13 | Hiawatha | 1855 | BR | 9,881 | 571 | 1,479 |
| Butler County | 15 | El Dorado | 1855 | BU | 65,827 | 1,428 | 3,699 |
| Chase County | 17 | Cottonwood Falls | 1859 | CS | 2,757 | 776 | 2,010 |
| Chautauqua County | 19 | Sedan | 1875 | CQ | 3,571 | 642 | 1,663 |
| Cherokee County | 21 | Columbus | 1855 | CK | 21,226 | 587 | 1,520 |
| Cheyenne County | 23 | Saint Francis | 1873 | CN | 2,678 | 1,020 | 2,642 |
| Clark County | 25 | Ashland | 1885 | CA | 2,181 | 975 | 2,525 |
| Clay County | 27 | Clay Center | 1857 | CY | 8,531 | 644 | 1,668 |
| Cloud County | 29 | Concordia | 1866 | CD | 9,397 | 716 | 1,854 |
| Coffey County | 31 | Burlington | 1855 | CF | 8,502 | 630 | 1,632 |
| Comanche County | 33 | Coldwater | 1867 | CM | 1,913 | 788 | 2,041 |
| Cowley County | 35 | Winfield | 1867 | CL | 36,288 | 1,126 | 2,916 |
| Crawford County | 37 | Girard | 1867 | CR | 39,361 | 593 | 1,536 |
| Decatur County | 39 | Oberlin | 1873 | DC | 2,871 | 894 | 2,315 |
| Dickinson County | 41 | Abilene | 1857 | DK | 19,762 | 848 | 2,196 |
| Doniphan County | 43 | Troy | 1855 | DP | 7,864 | 392 | 1,015 |
| Douglas County | 45 | Lawrence | 1855 | DG | 112,864 | 457 | 1,184 |
| Edwards County | 47 | Kinsley | 1874 | ED | 2,979 | 622 | 1,611 |
| Elk County | 49 | Howard | 1875 | EK | 2,720 | 648 | 1,678 |
| Ellis County | 51 | Hays | 1867 | EL | 29,053 | 900 | 2,331 |
| Ellsworth County | 53 | Ellsworth | 1867 | EW | 6,494 | 716 | 1,854 |
| Finney County | 55 | Garden City | 1883 | FI | 37,200 | 1,300 | 3,367 |
| Ford County | 57 | Dodge City | 1867 | FO | 34,752 | 1,099 | 2,846 |
| Franklin County | 59 | Ottawa | 1855 | FR | 25,906 | 574 | 1,487 |
| Geary County | 61 | Junction City | 1855 | GE | 38,013 | 384 | 995 |
| Gove County | 63 | Gove City | 1868 | GO | 2,729 | 1,072 | 2,776 |
| Graham County | 65 | Hill City | 1867 | GH | 2,578 | 898 | 2,326 |
| Grant County | 67 | Ulysses | 1888 | GT | 7,923 | 575 | 1,489 |
| Gray County | 69 | Cimarron | 1887 | GY | 6,030 | 869 | 2,251 |
| Greeley County | 71 | Tribune | 1873 | GL | 1,298 | 778 | 2,015 |
| Greenwood County | 73 | Eureka | 1855 | GW | 6,454 | 1,140 | 2,953 |
| Hamilton County | 75 | Syracuse | 1873 | HM | 2,639 | 996 | 2,580 |
| Harper County | 77 | Anthony | 1867 | HP | 5,911 | 802 | 2,077 |
| Harvey County | 79 | Newton | 1872 | HV | 34,852 | 539 | 1,396 |
| Haskell County | 81 | Sublette | 1887 | HS | 4,256 | 577 | 1,494 |
| Hodgeman County | 83 | Jetmore | 1867 | HG | 1,963 | 860 | 2,227 |
| Jackson County | 85 | Holton | 1855 | JA | 13,449 | 657 | 1,702 |
| Jefferson County | 87 | Oskaloosa | 1855 | JF | 18,945 | 536 | 1,388 |
| Jewell County | 89 | Mankato | 1867 | JW | 3,046 | 909 | 2,354 |
| Johnson County | 91 | Olathe | 1855 | JO | 559,913 | 477 | 1,235 |
| Kearny County | 93 | Lakin | 1887 | KE | 3,968 | 870 | 2,253 |
| Kingman County | 95 | Kingman | 1872 | KM | 7,863 | 864 | 2,238 |
| Kiowa County | 97 | Greensburg | 1886 | KW | 2,496 | 722 | 1,870 |
| Labette County | 99 | Oswego | 1867 | LB | 21,284 | 649 | 1,681 |
| Lane County | 101 | Dighton | 1873 | LE | 1,704 | 717 | 1,857 |
| Leavenworth County | 103 | Leavenworth | 1855 | LV | 77,739 | 463 | 1,199 |
| Lincoln County | 105 | Lincoln | 1867 | LC | 3,174 | 719 | 1,862 |
| Linn County | 107 | Mound City | 1855 | LN | 9,441 | 599 | 1,551 |
| Logan County | 109 | Oakley | 1888 | LG | 2,784 | 1,073 | 2,779 |
| Lyon County | 111 | Emporia | 1855 | LY | 33,748 | 851 | 2,204 |
| Marion County | 115 | Marion | 1860 | MN | 12,347 | 943 | 2,442 |
| Marshall County | 117 | Marysville | 1855 | MS | 10,022 | 903 | 2,339 |
| McPherson County | 113 | McPherson | 1867 | MP | 29,356 | 900 | 2,331 |
| Meade County | 119 | Meade | 1885 | ME | 4,396 | 978 | 2,533 |
| Miami County | 121 | Paola | 1855 | MI | 32,612 | 577 | 1,494 |
| Mitchell County | 123 | Beloit | 1867 | MC | 6,355 | 700 | 1,813 |
| Montgomery County | 125 | Independence | 1867 | MG | 34,459 | 645 | 1,671 |
| Morris County | 127 | Council Grove | 1855 | MR | 5,854 | 697 | 1,805 |
| Morton County | 129 | Elkhart | 1886 | MT | 3,169 | 730 | 1,891 |
| Nemaha County | 131 | Seneca | 1855 | NM | 10,132 | 719 | 1,862 |
| Neosho County | 133 | Erie | 1855 | NO | 16,406 | 572 | 1,481 |
| Ness County | 135 | Ness City | 1867 | NS | 3,068 | 1,075 | 2,784 |
| Norton County | 137 | Norton | 1867 | NT | 5,612 | 878 | 2,274 |
| Osage County | 139 | Lyndon | 1855 | OS | 16,142 | 704 | 1,823 |
| Osborne County | 141 | Osborne | 1867 | OB | 3,806 | 893 | 2,313 |
| Ottawa County | 143 | Minneapolis | 1860 | OT | 6,072 | 721 | 1,867 |
| Pawnee County | 145 | Larned | 1867 | PN | 6,928 | 754 | 1,953 |
| Phillips County | 147 | Phillipsburg | 1867 | PL | 5,519 | 886 | 2,295 |
| Pottawatomie County | 149 | Westmoreland | 1857 | PT | 22,302 | 844 | 2,186 |
| Pratt County | 151 | Pratt | 1867 | PR | 9,728 | 735 | 1,904 |
| Rawlins County | 153 | Atwood | 1873 | RA | 2,560 | 1,070 | 2,771 |
| Reno County | 155 | Hutchinson | 1867 | RN | 64,438 | 1,254 | 3,248 |
| Republic County | 157 | Belleville | 1868 | RP | 4,858 | 716 | 1,854 |
| Rice County | 159 | Lyons | 1867 | RC | 9,985 | 727 | 1,883 |
| Riley County | 161 | Manhattan | 1855 | RL | 75,508 | 610 | 1,580 |
| Rooks County | 163 | Stockton | 1867 | RO | 5,223 | 888 | 2,300 |
| Rush County | 165 | La Crosse | 1867 | RH | 3,220 | 718 | 1,860 |
| Russell County | 167 | Russell | 1867 | RS | 6,946 | 885 | 2,292 |
| Saline County | 169 | Salina | 1860 | SA | 55,988 | 720 | 1,865 |
| Scott County | 171 | Scott City | 1873 | SC | 4,937 | 718 | 1,860 |
| Sedgwick County | 173 | Wichita | 1867 | SG | 503,889 | 1,000 | 2,590 |
| Seward County | 175 | Liberal | 1873 | SW | 23,547 | 640 | 1,658 |
| Shawnee County | 177 | Topeka | 1855 | SN | 178,991 | 550 | 1,424 |
| Sheridan County | 179 | Hoxie | 1873 | SD | 2,538 | 896 | 2,321 |
| Sherman County | 181 | Goodland | 1873 | SH | 6,113 | 1,056 | 2,735 |
| Smith County | 183 | Smith Center | 1867 | SM | 3,765 | 896 | 2,321 |
| Stafford County | 185 | Saint John | 1867 | SF | 4,358 | 792 | 2,051 |
| Stanton County | 187 | Johnson City | 1887 | ST | 2,175 | 680 | 1,761 |
| Stevens County | 189 | Hugoton | 1886 | SV | 5,756 | 728 | 1,886 |
| Sumner County | 191 | Wellington | 1867 | SU | 23,674 | 1,182 | 3,061 |
| Thomas County | 193 | Colby | 1873 | TH | 7,941 | 1,075 | 2,784 |
| Trego County | 195 | WaKeeney | 1867 | TR | 2,986 | 888 | 2,300 |
| Wabaunsee County | 197 | Alma | 1855 | WB | 7,039 | 798 | 2,067 |
| Wallace County | 199 | Sharon Springs | 1868 | WA | 1,517 | 914 | 2,367 |
| Washington County | 201 | Washington | 1857 | WS | 5,758 | 898 | 2,326 |
| Wichita County | 203 | Leoti | 1873 | WH | 2,256 | 719 | 1,862 |
| Wilson County | 205 | Fredonia | 1855 | WL | 9,105 | 574 | 1,487 |
| Woodson County | 207 | Yates Center | 1855 | WO | 3,278 | 501 | 1,298 |
| Wyandotte County | 209 | Kansas City | 1859 | WY | 159,129 | 151 | 391 |
