Last official estimated population of St. Clair County was 9,833 (year 2014)[1]. This was 0.003% of total US population and 0.2% of total Missouri state population. Area of St. Clair County is 702.1 mi² (=1818.3 km²), in this year population density was 14.01 p/mi². If population growth rate would be same as in period 2010-2014 (+0.07%/yr), St. Clair County population in 2025 would be 9,910 [0].
Historical population of St. Clair County for period 1850-2014 [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
[1850-1860] +6.72 %/yr
[1860-1870] -0.1 %/yr
[1870-1880] +7.68 %/yr
[1880-1890] +1.72 %/yr
[1890-1900] +0.67 %/yr
[1900-1910] -0.87 %/yr
[1910-1920] -0.67 %/yr
[1920-1930] -1.43 %/yr
[1930-1940] -0.11 %/yr
[1940-1950] -2.24 %/yr
[1950-1960] -2.17 %/yr
[1960-1970] -0.93 %/yr
[1970-1980] +1.18 %/yr
[1980-1990] -0.19 %/yr
[1990-2000] +1.33 %/yr
[2000-2005] +0.17 %/yr
[2005-2010] +0.15 %/yr
[2010-2014] +0.07 %/yr
Looking for settlements in St. Clair County? Visit this page: Settlements in St. Clair County, MO
Population of St. Clair County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 224 | 236 | 460 |
| 5 to 9 | 261 | 231 | 492 |
| 10 to 14 | 257 | 244 | 501 |
| 15 to 19 | 275 | 246 | 521 |
| 20 to 24 | 238 | 189 | 427 |
| 25 to 29 | 235 | 219 | 454 |
| 30 to 34 | 223 | 191 | 414 |
| 35 to 39 | 207 | 205 | 412 |
| 40 to 44 | 270 | 249 | 519 |
| 45 to 49 | 257 | 279 | 536 |
| 50 to 54 | 400 | 350 | 750 |
| 55 to 59 | 384 | 369 | 753 |
| 60 to 64 | 400 | 349 | 749 |
| 65 to 69 | 355 | 372 | 727 |
| 70 to 74 | 315 | 317 | 632 |
| 75 to 79 | 242 | 255 | 497 |
| 80 to 84 | 144 | 163 | 307 |
| 85+ | 104 | 202 | 306 |
St. Clair 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 |
| WAC | 4699 | 4584 | 9,283 |
| NH | 4670 | 4567 | 9,237 |
| WA | 4604 | 4505 | 9,109 |
| NHWAC | 4593 | 4496 | 9,089 |
| NHWA | 4504 | 4420 | 8,924 |
| H | 121 | 99 | 220 |
| HWAC | 106 | 88 | 194 |
| IAC | 105 | 89 | 194 |
| HWA | 100 | 85 | 185 |
| TOM | 98 | 83 | 181 |
| NHIAC | 93 | 80 | 173 |
| NHTOM | 90 | 80 | 170 |
| BAC | 71 | 43 | 114 |
| NHBAC | 62 | 39 | 101 |
| IA | 41 | 38 | 79 |
| BA | 44 | 23 | 67 |
| NHIA | 34 | 31 | 65 |
| NHBA | 38 | 20 | 58 |
| AAC | 17 | 31 | 48 |
| NHAAC | 15 | 31 | 46 |
| HIAC | 12 | 9 | 21 |
| AA | 4 | 15 | 19 |
| NHAA | 4 | 15 | 19 |
| HIA | 7 | 7 | 14 |
| HBAC | 9 | 4 | 13 |
| HTOM | 8 | 3 | 11 |
| HBA | 6 | 3 | 9 |
| NAC | 1 | 4 | 5 |
| NHNAC | 1 | 3 | 4 |
| HAAC | 2 | 0 | 2 |
| NA | 0 | 2 | 2 |
| HNAC | 0 | 1 | 1 |
| NHNA | 0 | 1 | 1 |
| HNA | 0 | 1 | 1 |
| HAA | 0 | 0 | 0 |
• Polk County population
35.6 mi, 
145°
• Henry County
24 mi, 
357°
• Vernon County
33.6 mi, 
247°
• Benton County
32 mi, 
55°
• Bates County
34.3 mi, 
296°
• Dallas County
47.2 mi, 
121°
• Cedar County
21.5 mi, 
191°
• Barton County
48.5 mi, 
219°
• Hickory County
25.5 mi, 
106°
• Dade County
42.2 mi, 186°
[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
*Rives (Henry), Polk Missouri Notes
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