| County | Pop. (2020) | Latest Visit | County Seat | Visited? | |
| Adair | 25,314 | 31-Jul-2003 | Kirksville | yes | |
| Andrew | 18,135 | 5-Oct-2023 | Savannah | yes | |
| Atchison | 5,305 | 1-Sep-2011 | Rock Port | yes | |
| Audrain | 24,962 | 24-Jul-2004 | Mexico | ||
| Barry | 34,534 | 25-Jul-2019 | Cassville | ||
| Barton | 11,637 | 19-Oct-2022 | Lamar | yes | |
| Bates | 16,042 | 3-Sep-2011 | Butler | yes | |
| Benton | 19,394 | 14-Aug-2005 | Warsaw | yes | |
| Bollinger | 10,567 | 16-Aug-2008 | Marble Hill | yes | |
| Boone | 183,610 | 17-Sep-2021 | Columbia | yes | |
| Buchanan | 84,793 | 5-Oct-2023 | St. Joseph | yes | |
| Butler | 42,130 | 20-Oct-2022 | Poplar Bluff | yes | |
| Caldwell | 8,815 | 7-Aug-2006 | Kingston | yes | |
| Callaway | 44,283 | 25-Aug-2018 | Fulton | ||
| Camden | 42,745 | 20-Aug-2005 | Camdenton | yes | |
| Cape Girardeau | 81,710 | 14-Jul-2022 | Jackson | yes | |
| Carroll | 8,495 | 7-Aug-2005 | Carrollton | yes | |
| Carter | 5,202 | 26-Jul-2019 | Van Buren | ||
| Cass | 107,824 | 3-Sep-2011 | Harrisonville | yes | |
| Cedar | 14,188 | 20-Aug-2005 | Stockton | yes | |
| Chariton | 7,408 | 24-Jul-2004 | Keytesville | yes | |
| Christian | 88,842 | 19-Oct-2022 | Ozark | yes | |
| Clark | 6,634 | 30-Jun-2023 | Kahoka | yes | |
| Clay | 253,335 | 16-Sep-2021 | Liberty | yes | |
| Clinton | 21,184 | 8-Jun-2020 | Plattsburg | ||
| Cole | 77,279 | 5-Aug-2006 | Jefferson City | yes | |
| Cooper | 17,103 | 17-Sep-2021 | Boonville | yes | |
| Crawford | 23,056 | 20-Nov-2018 | Steelville | ||
| Dade | 7,569 | 19-Oct-2022 | Greenfield | yes | |
| Dallas | 17,071 | 14-Aug-2005 | Buffalo | yes | |
| Daviess | 8,430 | 8-Jun-2020 | Gallatin | yes | |
| DeKalb | 11,029 | 5-Oct-2023 | Maysville | yes | |
| Dent | 14,421 | 5-Aug-2006 | Salem | yes | |
| Douglas | 11,578 | 10-Aug-2008 | Ava | yes | |
| Dunklin | 28,283 | 20-Oct-2022 | Kennett | yes | |
| Franklin | 104,682 | 19-Oct-2023 | Union | yes | |
| Gasconade | 14,794 | 19-Oct-2023 | Hermann | ||
| Gentry | 6,162 | 5-Oct-2023 | Albany | ||
| Greene | 298,915 | 19-Oct-2022 | Springfield | yes | |
| Grundy | 9,808 | 7-Aug-2005 | Trenton | yes | |
| Harrison | 8,157 | 8-Jun-2020 | Bethany | yes | |
| Henry | 21,946 | 14-Aug-2005 | Clinton | yes | |
| Hickory | 8,279 | 20-Aug-2005 | Hermitage | yes | |
| Holt | 4,223 | 1-Sep-2011 | Oregon | ||
| Howard | 10,151 | 17-Sep-2021 | Fayette | yes | |
| Howell | 39,750 | 19-Oct-2023 | West Plains | yes | |
| Iron | 9,537 | 5-Aug-2006 | Ironton | ||
| Jackson | 717,204 | 17-Sep-2021 | Independence | yes | |
| Jasper | 122,761 | 22-Jul-2021 | Carthage | yes | |
| Jefferson | 226,739 | 19-Oct-2023 | Hillsboro | ||
| Johnson | 54,013 | 5-Aug-2006 | Warrensburg | yes | |
| Knox | 3,744 | 31-Jul-2003 | Edina | ||
| Laclede | 36,039 | 20-Nov-2018 | Lebanon | yes | |
| Lafayette | 32,984 | 17-Sep-2021 | Lexington | ||
| Lawrence | 38,001 | 22-Jul-2021 | Mount Vernon | yes | |
| Lewis | 10,032 | 8-Jun-2020 | Monticello | ||
| Lincoln | 59,574 | 17-Sep-2021 | Troy | yes | |
| Linn | 11,874 | 7-Aug-2006 | Linneus | ||
| Livingston | 14,557 | 7-Aug-2006 | Chillicothe | yes | |
| McDonald | 23,303 | 5-Aug-2022 | Pineville | yes | |
| Macon | 15,209 | 7-Aug-2006 | Macon | yes | |
| Madison | 12,626 | 10-Aug-2008 | Fredericktown | yes | |
| Maries | 8,432 | 19-Oct-2023 | Vienna | yes | |
| Marion | 28,525 | 17-Sep-2021 | Palmyra | yes | |
| Mercer | 3,538 | 30-Jun-2023 | Princeton | yes | |
| Miller | 24,722 | 20-Aug-2005 | Tuscumbia | ||
| Mississippi | 12,577 | 20-Oct-2022 | Charleston | yes | |
| Moniteau | 15,473 | 5-Aug-2006 | California | yes | |
| Monroe | 8,666 | 17-Sep-2021 | Paris | yes | |
| Montgomery | 11,322 | 25-Aug-2018 | Montgomery City | ||
| Morgan | 21,006 | 5-Aug-2006 | Versailles | ||
| New Madrid | 16,434 | 20-Oct-2022 | New Madrid | yes | |
| Newton | 58,648 | 25-Jul-2019 | Neosho | yes | |
| Nodaway | 21,241 | 5-Oct-2023 | Maryville | yes | |
| Oregon | 8,635 | 19-Oct-2023 | Alton | yes | |
| Osage | 13,274 | 19-Oct-2023 | Linn | yes | |
| Ozark | 8,553 | 19-Oct-2022 | Gainesville | yes | |
| Pemiscot | 15,661 | 6-Aug-2022 | Caruthersville | yes | |
| Perry | 18,956 | 19-Oct-2023 | Perryville | yes | |
| Pettis | 42,980 | 5-Aug-2006 | Sedalia | yes | |
| Phelps | 44,638 | 19-Oct-2023 | Rolla | yes | |
| Pike | 17,587 | 17-Sep-2021 | Bowling Green | yes | |
| Platte | 106,718 | 8-Jun-2020 | Platte City | yes | |
| Polk | 31,519 | 14-Aug-2005 | Bolivar | yes | |
| Pulaski | 53,955 | 20-Nov-2018 | Waynesville | yes | |
| Putnam | 4,681 | 30-Jun-2023 | Unionville | yes | |
| Ralls | 10,355 | 17-Sep-2021 | New London | ||
| Randolph | 24,716 | 17-Sep-2021 | Huntsville | ||
| Ray | 23,158 | 7-Aug-2005 | Richmond | yes | |
| Reynolds | 6,096 | 10-Aug-2008 | Centerville | ||
| Ripley | 10,679 | 20-Oct-2022 | Doniphan | yes | |
| St. Charles | 405,262 | 17-Sep-2021 | St. Charles | yes | |
| St. Clair | 9,284 | 20-Aug-2005 | Osceola | ||
| Ste. Genevieve | 18,479 | 19-Oct-2023 | Ste. Genevieve | yes | |
| St. Francois | 66,922 | 10-Aug-2008 | Farmington | yes | |
| St. Louis | 1,004,125 | 19-Oct-2023 | Clayton | yes | |
| Saline | 23,333 | 17-Sep-2021 | Marshall | yes | |
| Schuyler | 4,032 | 30-Jun-2023 | Lancaster | yes | |
| Scotland | 4,716 | 30-Jun-2023 | Memphis | yes | |
| Scott | 38,059 | 14-Jul-2022 | Benton | yes | |
| Shannon | 7,031 | 26-Jul-2019 | Eminence | yes | |
| Shelby | 6,103 | 7-Aug-2006 | Shelbyville | ||
| Stoddard | 28,672 | 26-Jul-2019 | Bloomfield | ||
| Stone | 31,076 | 22-Jul-2021 | Galena | ||
| Sullivan | 5,999 | 31-Jul-2003 | Milan | ||
| Taney | 56,066 | 19-Oct-2022 | Forsyth | yes | |
| Texas | 24,487 | 19-Oct-2023 | Houston | yes | |
| Vernon | 19,707 | 3-Sep-2011 | Nevada | yes | |
| Warren | 35,532 | 25-Aug-2018 | Warrenton | yes | |
| Washington | 23,514 | 5-Aug-2006 | Potosi | ||
| Wayne | 10,974 | 10-Aug-2008 | Greenville | yes | |
| Webster | 39,085 | 26-Jul-2019 | Marshfield | yes | |
| Worth | 1,973 | 5-Oct-2023 | Grant City | yes | |
| Wright | 18,188 | 26-Jul-2019 | Hartville | ||
| Independent City (included in totals) | |||||
| St. Louis | 301,578 | 17-Sep-2021 | |||