Last official estimated population of St. Charles County was 361,671 (year 2014)[1]. This was 0.113% of total US population and 5.9% of total Missouri state population. Area of St. Charles County is 592.6 mi² (=1534.8 km²), in this year population density was 610.30 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), St. Charles County population in 2025 would be 364,953 [0].
Historical population of St. Charles 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] +1.25 %/yr
[1820-1830] +0.85 %/yr
[1830-1840] +6.24 %/yr
[1840-1850] +3.77 %/yr
[1850-1860] +3.73 %/yr
[1860-1870] +2.57 %/yr
[1870-1880] +0.8 %/yr
[1880-1890] -0.04 %/yr
[1890-1900] +0.63 %/yr
[1900-1910] +0.09 %/yr
[1910-1920] -0.78 %/yr
[1920-1930] +0.65 %/yr
[1930-1940] +0.49 %/yr
[1940-1950] +1.56 %/yr
[1950-1960] +5.91 %/yr
[1960-1970] +5.78 %/yr
[1970-1980] +4.48 %/yr
[1980-1990] +3.97 %/yr
[1990-2000] +2.93 %/yr
[2000-2005] +2.98 %/yr
[2005-2010] +1.85 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in St. Charles County? Visit this page: Settlements in St. Charles County, MO
Population of St. Charles County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 11952 | 11176 | 23,128 |
| 5 to 9 | 13139 | 12744 | 25,883 |
| 10 to 14 | 13807 | 13317 | 27,124 |
| 15 to 19 | 13164 | 12517 | 25,681 |
| 20 to 24 | 12163 | 11734 | 23,897 |
| 25 to 29 | 11661 | 11628 | 23,289 |
| 30 to 34 | 13120 | 13459 | 26,579 |
| 35 to 39 | 12447 | 12483 | 24,930 |
| 40 to 44 | 12551 | 12830 | 25,381 |
| 45 to 49 | 12688 | 13256 | 25,944 |
| 50 to 54 | 14491 | 15066 | 29,557 |
| 55 to 59 | 13101 | 13643 | 26,744 |
| 60 to 64 | 10028 | 11128 | 21,156 |
| 65 to 69 | 8014 | 9043 | 17,057 |
| 70 to 74 | 5631 | 6592 | 12,223 |
| 75 to 79 | 3846 | 4755 | 8,601 |
| 80 to 84 | 2548 | 3543 | 6,091 |
| 85+ | 2039 | 4189 | 6,228 |
St. Charles 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 | 180257 | 187384 | 367,641 |
| WAC | 172300 | 178367 | 350,667 |
| WA | 168928 | 175178 | 344,106 |
| NHWAC | 166698 | 173104 | 339,802 |
| NHWA | 163582 | 170148 | 333,730 |
| BAC | 10642 | 10622 | 21,264 |
| NHBAC | 10266 | 10340 | 20,606 |
| BA | 8851 | 8937 | 17,788 |
| NHBA | 8621 | 8770 | 17,391 |
| H | 6133 | 5719 | 11,852 |
| AAC | 5485 | 6040 | 11,525 |
| NHAAC | 5354 | 5888 | 11,242 |
| HWAC | 5602 | 5263 | 10,865 |
| HWA | 5346 | 5030 | 10,376 |
| AA | 4428 | 5063 | 9,491 |
| NHAA | 4353 | 4967 | 9,320 |
| TOM | 3541 | 3347 | 6,888 |
| NHTOM | 3259 | 3096 | 6,355 |
| IAC | 1413 | 1378 | 2,791 |
| NHIAC | 1150 | 1124 | 2,274 |
| IA | 497 | 467 | 964 |
| NHIA | 347 | 325 | 672 |
| HBAC | 376 | 282 | 658 |
| HTOM | 282 | 251 | 533 |
| HIAC | 263 | 254 | 517 |
| NAC | 280 | 233 | 513 |
| HBA | 230 | 167 | 397 |
| NHNAC | 211 | 182 | 393 |
| HIA | 150 | 142 | 292 |
| HAAC | 131 | 152 | 283 |
| NA | 145 | 111 | 256 |
| NHNA | 95 | 78 | 173 |
| HAA | 75 | 96 | 171 |
| HNAC | 69 | 51 | 120 |
| HNA | 50 | 33 | 83 |
• St. Louis County population
15.7 mi, 
128°
• St. Louis city
25.3 mi, 
113°
• Madison County
41.8 mi, 
85°
• Jefferson County
36.9 mi, 
168°
• Franklin County
33.6 mi, 
219°
• Lincoln County
24.8 mi, 
321°
• Warren County
26.1 mi, 
267°
• Jersey County
26.7 mi, 
39°
• Greene County
42.6 mi, 
21°
• Calhoun County
26.5 mi, 
1°
[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
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