Last official estimated population of St. Louis County was 998,880 (year 2014)[1]. This was 0.313% of total US population and 16.4% of total Missouri state population. Area of St. Louis County is 523.0 mi² (=1354.5 km²), in this year population density was 1,909.98 p/mi². If population growth rate would be same as in period 2010-2014 (-0%/yr), St. Louis County population in 2026 would be 998,658 [0].
Historical population of St. Louis County for period 1810-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1810-1820] +5.9 %/yr
[1820-1830] +3.46 %/yr
[1830-1840] +9.8 %/yr
[1840-1850] +11.3 %/yr
[1850-1860] +6.14 %/yr
[1860-1870] +6.31 %/yr
[1870-1880] -21.33 %/yr
[1880-1890] +1.31 %/yr
[1890-1900] +3.26 %/yr
[1900-1910] +5.12 %/yr
[1910-1920] +2.03 %/yr
[1920-1930] +7.7 %/yr
[1930-1940] +2.63 %/yr
[1940-1950] +4.01 %/yr
[1950-1960] +5.64 %/yr
[1960-1970] +3.06 %/yr
[1970-1980] +0.23 %/yr
[1980-1990] +0.2 %/yr
[1990-2000] +0.23 %/yr
[2000-2005] -0.24 %/yr
[2005-2010] -0.1 %/yr
[2010-2014] -0 %/yr
Looking for settlements in St. Louis County? Visit this page: Settlements in St. Louis County, MO
Population of St. Louis County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 29584 | 28392 | 57,976 |
| 5 to 9 | 30758 | 29817 | 60,575 |
| 10 to 14 | 32808 | 31699 | 64,507 |
| 15 to 19 | 33699 | 32040 | 65,739 |
| 20 to 24 | 31670 | 32458 | 64,128 |
| 25 to 29 | 30664 | 32610 | 63,274 |
| 30 to 34 | 30607 | 33155 | 63,762 |
| 35 to 39 | 27295 | 30402 | 57,697 |
| 40 to 44 | 28154 | 31803 | 59,957 |
| 45 to 49 | 30240 | 33940 | 64,180 |
| 50 to 54 | 35364 | 40099 | 75,463 |
| 55 to 59 | 35455 | 39671 | 75,126 |
| 60 to 64 | 29644 | 34709 | 64,353 |
| 65 to 69 | 23109 | 28317 | 51,426 |
| 70 to 74 | 16308 | 20751 | 37,059 |
| 75 to 79 | 11470 | 15889 | 27,359 |
| 80 to 84 | 8920 | 13775 | 22,695 |
| 85+ | 8700 | 17900 | 26,600 |
St. Louis County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 460499 | 513849 | 974,348 |
| WAC | 345974 | 372097 | 718,071 |
| WA | 337355 | 363111 | 700,466 |
| NHWAC | 333396 | 359939 | 693,335 |
| NHWA | 325314 | 351495 | 676,809 |
| BAC | 112252 | 137761 | 250,013 |
| NHBAC | 110988 | 136419 | 247,407 |
| BA | 106972 | 132174 | 239,146 |
| NHBA | 106055 | 131172 | 237,227 |
| AAC | 22668 | 24255 | 46,923 |
| NHAAC | 22424 | 24014 | 46,438 |
| AA | 19297 | 20776 | 40,073 |
| NHAA | 19216 | 20701 | 39,917 |
| H | 13950 | 13578 | 27,528 |
| HWAC | 12578 | 12158 | 24,736 |
| HWA | 12041 | 11616 | 23,657 |
| TOM | 9560 | 10085 | 19,645 |
| NHTOM | 8947 | 9472 | 18,419 |
| IAC | 3574 | 3936 | 7,510 |
| NHIAC | 3029 | 3421 | 6,450 |
| HBAC | 1264 | 1342 | 2,606 |
| IA | 1136 | 1157 | 2,293 |
| HBA | 917 | 1002 | 1,919 |
| NHIA | 854 | 899 | 1,753 |
| HTOM | 613 | 613 | 1,226 |
| HIAC | 545 | 515 | 1,060 |
| NAC | 491 | 492 | 983 |
| NHNAC | 421 | 424 | 845 |
| HIA | 282 | 258 | 540 |
| HAAC | 244 | 241 | 485 |
| NA | 129 | 124 | 253 |
| NHNA | 113 | 110 | 223 |
| HAA | 81 | 75 | 156 |
| HNAC | 70 | 68 | 138 |
| HNA | 16 | 14 | 30 |
• St. Charles County population
15.7 mi, 
308°
• St. Louis city
10.9 mi, 
91°
• St. Clair County
30.3 mi, 
112°
• Madison County
32.1 mi, 
66°
• Jefferson County
27 mi, 
191°
• Franklin County
37.5 mi, 
244°
• Monroe County
28.9 mi, 
150°
• Warren County
39.4 mi, 
282°
• Jersey County
30.7 mi, 
8°
• Calhoun County
38.1 mi, 
341°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
See note 6 Missouri Notes
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