Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| St. Louis | 1 | 275,506 | 300,496 | -2.22% | 4,464 | 61.7 | City |
| Florissant | 2 | 50,687 | 52,449 | -0.86% | 4,038 | 12.6 | City |
| Chesterfield | 3 | 48,904 | 49,952 | -0.53% | 1,536 | 31.8 | City |
| Oakville | 4 | 35,290 | 36,117 | -0.17% | 2,223 | 15.9 | CDP |
| University City | 5 | 33,794 | 35,002 | -0.89% | 5,745 | 5.9 | City |
| Ballwin | 6 | 30,167 | 31,139 | -0.8% | 3,359 | 9.0 | City |
| Mehlville | 7 | 29,207 | 28,824 | 0.2% | 3,906 | 7.5 | CDP |
| Kirkwood | 8 | 29,081 | 29,452 | -0.32% | 3,167 | 9.2 | City |
| Maryland Heights | 9 | 27,347 | 28,257 | -0.83% | 1,250 | 21.9 | City |
| Hazelwood | 10 | 24,675 | 25,427 | -0.76% | 1,539 | 16.0 | City |
| Webster Groves | 11 | 23,268 | 23,992 | -0.77% | 3,935 | 5.9 | City |
| Old Jamestown | 12 | 20,588 | 19,602 | 0.49% | 1,377 | 14.9 | CDP |
| Affton | 13 | 19,858 | 19,580 | -0.16% | 4,345 | 4.6 | CDP |
| Concord | 14 | 18,970 | 18,521 | 0.97% | 3,452 | 5.5 | CDP |
| Creve Coeur | 15 | 18,339 | 18,811 | -0.64% | 1,785 | 10.3 | City |
| Manchester | 16 | 17,910 | 18,316 | -0.57% | 3,559 | 5.0 | City |
| Ferguson | 17 | 17,832 | 18,487 | -0.91% | 2,891 | 6.2 | City |
| Spanish Lake | 18 | 17,784 | 17,682 | -0.75% | 2,412 | 7.4 | CDP |
| Clayton | 19 | 17,499 | 17,347 | 0.22% | 6,980 | 2.5 | City |
| Lemay | 20 | 16,139 | 16,565 | -0.22% | 3,946 | 4.1 | CDP |
| Overland | 21 | 15,356 | 15,916 | -0.9% | 3,499 | 4.4 | City |
| Eureka | 22 | 13,533 | 11,769 | 3.37% | 1,215 | 11.1 | City |
| Jennings | 23 | 12,814 | 12,901 | -0.17% | 3,433 | 3.7 | City |
| St. Ann | 24 | 12,545 | 12,996 | -0.89% | 3,976 | 3.2 | City |
| Crestwood | 25 | 12,101 | 12,395 | -0.61% | 3,375 | 3.6 | City |
| Town Country | 26 | 11,522 | 11,644 | -0.27% | 1,003 | 11.5 | City |
| Bridgeton | 27 | 11,205 | 11,427 | -0.5% | 770 | 14.6 | City |
| Bellefontaine Neighbors | 28 | 10,260 | 10,699 | -1.06% | 2,332 | 4.4 | City |
| Des Peres | 29 | 9,070 | 9,186 | -0.32% | 2,100 | 4.3 | City |
| Sunset Hills | 30 | 8,994 | 9,181 | -0.52% | 1,002 | 9.0 | City |
| Richmond Heights | 31 | 8,986 | 9,274 | -0.8% | 3,922 | 2.3 | City |
| Olivette | 32 | 8,954 | 8,508 | 1.26% | 3,231 | 2.8 | City |
| Ladue | 33 | 8,846 | 8,980 | -0.38% | 1,033 | 8.6 | City |
| Brentwood | 34 | 8,020 | 8,219 | -0.62% | 4,107 | 2.0 | City |
| Berkeley | 35 | 7,969 | 8,217 | -0.77% | 1,606 | 5.0 | City |
| Maplewood | 36 | 7,969 | 8,256 | -0.9% | 5,092 | 1.6 | City |
| Sappington | 37 | 6,949 | 7,161 | -0.64% | 2,903 | 2.4 | CDP |
| Valley Park | 38 | 6,675 | 6,875 | -0.74% | 1,482 | 4.5 | City |
| Black Jack | 39 | 6,503 | 6,641 | -0.53% | 2,515 | 2.6 | City |
| St. John | 40 | 6,403 | 6,629 | -0.88% | 4,496 | 1.4 | City |
| Shrewsbury | 41 | 6,191 | 6,398 | -0.83% | 4,296 | 1.4 | City |
| Glendale | 42 | 6,010 | 6,172 | -0.68% | 4,634 | 1.3 | City |
| Glasgow Village | 43 | 5,491 | 5,285 | 0.09% | 5,732 | 1.0 | CDP |
| Dellwood | 44 | 4,781 | 4,900 | -0.62% | 4,610 | 1.0 | City |
| Rock Hill | 45 | 4,618 | 4,742 | -0.67% | 4,187 | 1.1 | City |
| Breckenridge Hills | 46 | 4,312 | 4,455 | -0.83% | 5,383 | 0.8 | City |
| Normandy | 47 | 4,190 | 4,280 | -0.55% | 2,261 | 1.9 | City |
| Fenton | 48 | 4,025 | 4,115 | -0.57% | 642 | 6.3 | City |
| Woodson Terrace | 49 | 3,844 | 3,950 | -0.7% | 4,960 | 0.8 | City |
| Frontenac | 50 | 3,761 | 3,624 | 0.91% | 1,305 | 2.9 | City |
| Northwoods | 51 | 3,550 | 3,681 | -0.92% | 5,086 | 0.7 | City |
| Castle Point | 52 | 2,770 | 2,390 | -2.98% | 4,556 | 0.6 | CDP |
| Pine Lawn | 53 | 2,658 | 2,756 | -0.93% | 4,294 | 0.6 | City |
| Green Park | 54 | 2,649 | 2,708 | -0.56% | 2,024 | 1.3 | City |
| Pagedale | 55 | 2,490 | 2,553 | -0.64% | 2,068 | 1.2 | City |
| Riverview | 56 | 2,305 | 2,392 | -0.95% | 2,777 | 0.8 | Village |
| St. George | 57 | 2,188 | 2,168 | 7.73% | 9,079 | 0.2 | CDP |
| Marlborough | 58 | 2,167 | 2,218 | -0.6% | 9,546 | 0.2 | Village |
| Moline Acres | 59 | 2,076 | 2,154 | -0.95% | 3,623 | 0.6 | City |
| Bel-Ridge | 60 | 2,059 | 2,133 | -0.91% | 2,664 | 0.8 | Village |
| Warson Woods | 61 | 1,970 | 2,018 | -0.6% | 3,468 | 0.6 | City |
| Hanley Hills | 62 | 1,943 | 1,995 | -0.66% | 5,412 | 0.4 | Village |
| Vinita Park | 63 | 1,908 | 1,978 | -0.94% | 2,446 | 0.8 | City |
| Wellston | 64 | 1,599 | 1,535 | 1.01% | 1,716 | 0.9 | City |
| Lakeshire | 65 | 1,500 | 1,555 | -0.92% | 6,696 | 0.2 | City |
| Winchester | 66 | 1,390 | 1,440 | -0.93% | 5,538 | 0.3 | City |
| Oakland | 67 | 1,363 | 1,391 | -0.51% | 2,260 | 0.6 | City |
| Bel-Nor | 68 | 1,341 | 1,395 | -1.03% | 2,132 | 0.6 | Village |
| Charlack | 69 | 1,266 | 1,298 | -0.63% | 4,672 | 0.3 | City |
| Velda City | 70 | 1,264 | 1,188 | 1.53% | 7,755 | 0.2 | City |
| Hillsdale | 71 | 1,170 | 1,213 | -0.93% | 3,421 | 0.3 | Village |
| Calverton Park | 72 | 1,115 | 1,142 | -0.62% | 2,713 | 0.4 | City |
| Cool Valley | 73 | 996 | 1,035 | -0.99% | 2,175 | 0.5 | City |
| Country Club Hills | 74 | 987 | 1,014 | -0.7% | 5,306 | 0.2 | City |
| Grantwood Village | 75 | 915 | 939 | -0.65% | 1,120 | 0.8 | Town |
| Pasadena Hills | 76 | 874 | 910 | -1.02% | 4,123 | 0.2 | City |
| Norwood Court | 77 | 867 | 889 | -0.69% | 7,107 | 0.1 | Town |
| Velda Village Hills | 78 | 840 | 876 | -1.06% | 7,000 | 0.1 | City |
| Edmundson | 79 | 836 | 858 | -0.71% | 3,051 | 0.3 | City |
| Bella Villa | 80 | 724 | 752 | -0.96% | 5,656 | 0.1 | City |
| Flordell Hills | 81 | 698 | 724 | -0.99% | 5,675 | 0.1 | City |
| Greendale | 82 | 627 | 643 | -0.63% | 3,266 | 0.2 | City |
| Twin Oaks | 83 | 581 | 595 | -0.68% | 2,160 | 0.3 | Village |
| Sycamore Hills | 84 | 541 | 557 | -0.73% | 4,037 | 0.1 | Village |
| Crystal Lake Park | 85 | 499 | 509 | -0.6% | 5,144 | 0.1 | City |
| Beverly Hills | 86 | 453 | 471 | -1.09% | 5,033 | 0.1 | City |
| Pasadena Park | 87 | 421 | 439 | -1.17% | 4,296 | 0.1 | Village |
| Wilbur Park | 88 | 420 | 432 | -0.71% | 7,119 | 0.1 | Village |
| Huntleigh | 89 | 349 | 356 | -0.57% | 352 | 1.0 | City |
| Westwood | 90 | 305 | 315 | -0.97% | 485 | 0.6 | Village |
| Uplands Park | 91 | 301 | 311 | -0.99% | 4,561 | 0.1 | Village |
| Kinloch | 92 | 258 | 265 | -0.77% | 355 | 0.7 | City |
| Bellerive Acres | 93 | 182 | 188 | -1.09% | 535 | 0.3 | City |
| Glen Echo Park | 94 | 113 | 117 | -0.88% | 3,531 | 0.0 | Village |
| Country Life Acres | 95 | 70 | 73 | -1.41% | 565 | 0.1 | Village |
| Champ | 96 | 8 | 8 | 0% | 10 | 0.8 | Village |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
St. Louis is the largest city in St. Louis County.
Champ is the smallest city in St. Louis County.
There are 96 cities in St. Louis County, Missouri.