All counties in Missouri
| County Name | Population | State | Rank |
|---|
| St. Louis County | 998,954 | Missouri | 1 |
| Jackson County | 674,158 | Missouri | 2 |
| St. Charles County | 360,485 | Missouri | 3 |
| St. Louis City | 319,294 | Missouri | 4 |
| Greene County | 275,174 | Missouri | 5 |
| Clay County | 221,939 | Missouri | 6 |
| Jefferson County | 218,733 | Missouri | 7 |
| Boone County | 162,642 | Missouri | 8 |
| Jasper County | 117,404 | Missouri | 9 |
| Franklin County | 101,492 | Missouri | 10 |
| Cass County | 99,478 | Missouri | 11 |
| Platte County | 89,322 | Missouri | 12 |
| Buchanan County | 89,201 | Missouri | 13 |
| Christian County | 77,422 | Missouri | 14 |
| Cole County | 75,990 | Missouri | 15 |
| Cape Girardeau County | 75,674 | Missouri | 16 |
| St. Francois County | 65,359 | Missouri | 17 |
| Newton County | 58,114 | Missouri | 18 |
| Johnson County | 52,595 | Missouri | 19 |
| Lincoln County | 52,566 | Missouri | 20 |
| Pulaski County | 52,274 | Missouri | 21 |
| Taney County | 51,675 | Missouri | 22 |
| Phelps County | 45,156 | Missouri | 23 |
| Callaway County | 44,332 | Missouri | 24 |
| Camden County | 44,002 | Missouri | 25 |
| Butler County | 42,794 | Missouri | 26 |
| Pettis County | 42,201 | Missouri | 27 |
| Howell County | 40,400 | Missouri | 28 |
| Scott County | 39,191 | Missouri | 29 |
| Lawrence County | 38,634 | Missouri | 30 |
| Webster County | 36,202 | Missouri | 31 |
| Barry County | 35,597 | Missouri | 32 |
| Laclede County | 35,571 | Missouri | 33 |
| Lafayette County | 33,381 | Missouri | 34 |
| Warren County | 32,513 | Missouri | 35 |
| Stone County | 32,202 | Missouri | 36 |
| Dunklin County | 31,953 | Missouri | 37 |
| Polk County | 31,137 | Missouri | 38 |
| Stoddard County | 29,968 | Missouri | 39 |
| Marion County | 28,781 | Missouri | 40 |
| Texas County | 26,008 | Missouri | 41 |
| Adair County | 25,607 | Missouri | 42 |
| Audrain County | 25,529 | Missouri | 43 |
| Randolph County | 25,414 | Missouri | 44 |
| Washington County | 25,195 | Missouri | 45 |
| Miller County | 24,748 | Missouri | 46 |
| Crawford County | 24,696 | Missouri | 47 |
| Ray County | 23,494 | Missouri | 48 |
| Saline County | 23,370 | Missouri | 49 |
| Nodaway County | 23,370 | Missouri | 50 |
| Mcdonald County | 23,083 | Missouri | 51 |
| Henry County | 22,272 | Missouri | 52 |
| Vernon County | 21,159 | Missouri | 53 |
| Clinton County | 20,743 | Missouri | 54 |
| Morgan County | 20,565 | Missouri | 55 |
| Benton County | 19,056 | Missouri | 56 |
| Perry County | 18,971 | Missouri | 57 |
| New Madrid County | 18,956 | Missouri | 58 |
| Wright County | 18,815 | Missouri | 59 |
| Pike County | 18,516 | Missouri | 60 |
| Pemiscot County | 18,296 | Missouri | 61 |
| Ste. Genevieve County | 18,145 | Missouri | 62 |
| Cooper County | 17,601 | Missouri | 63 |
| Andrew County | 17,291 | Missouri | 64 |
| Bates County | 17,049 | Missouri | 65 |
| Dallas County | 16,777 | Missouri | 66 |
| Dent County | 15,657 | Missouri | 67 |
| Moniteau County | 15,607 | Missouri | 68 |
| Macon County | 15,566 | Missouri | 69 |
| Gasconade County | 15,222 | Missouri | 70 |
| Livingston County | 15,195 | Missouri | 71 |
| Mississippi County | 14,358 | Missouri | 72 |
| Ripley County | 14,100 | Missouri | 73 |
| Cedar County | 13,982 | Missouri | 74 |
| Osage County | 13,878 | Missouri | 75 |
| Douglas County | 13,684 | Missouri | 76 |
| Wayne County | 13,521 | Missouri | 77 |
| Dekalb County | 12,892 | Missouri | 78 |
| Linn County | 12,761 | Missouri | 79 |
| Barton County | 12,402 | Missouri | 80 |
| Bollinger County | 12,363 | Missouri | 81 |
| Montgomery County | 12,236 | Missouri | 82 |
| Madison County | 12,226 | Missouri | 83 |
| Oregon County | 10,881 | Missouri | 84 |
| Iron County | 10,630 | Missouri | 85 |
| Grundy County | 10,261 | Missouri | 86 |
| Lewis County | 10,211 | Missouri | 87 |
| Ralls County | 10,167 | Missouri | 88 |
| Howard County | 10,144 | Missouri | 89 |
| St. Clair County | 9,805 | Missouri | 90 |
| Ozark County | 9,723 | Missouri | 91 |
| Hickory County | 9,627 | Missouri | 92 |
| Caldwell County | 9,424 | Missouri | 93 |
| Carroll County | 9,295 | Missouri | 94 |
| Maries County | 9,176 | Missouri | 95 |
| Harrison County | 8,957 | Missouri | 96 |
| Monroe County | 8,840 | Missouri | 97 |
| Shannon County | 8,441 | Missouri | 98 |
| Daviess County | 8,433 | Missouri | 99 |
| Dade County | 7,883 | Missouri | 100 |
| Chariton County | 7,831 | Missouri | 101 |
| Clark County | 7,139 | Missouri | 102 |
| Gentry County | 6,738 | Missouri | 103 |
| Sullivan County | 6,714 | Missouri | 104 |
| Reynolds County | 6,696 | Missouri | 105 |
| Shelby County | 6,373 | Missouri | 106 |
| Carter County | 6,265 | Missouri | 107 |
| Atchison County | 5,685 | Missouri | 108 |
| Putnam County | 4,979 | Missouri | 109 |
| Holt County | 4,912 | Missouri | 110 |
| Scotland County | 4,843 | Missouri | 111 |
| Schuyler County | 4,431 | Missouri | 112 |
| Knox County | 4,131 | Missouri | 113 |
| Mercer County | 3,785 | Missouri | 114 |
| Worth County | 2,171 | Missouri | 115 |