Last official estimated population of St. Clair County was 270,406 (year 2014)[1]. This was 0.085% of total US population and 2.1% of total Illinois state population. Area of St. Clair County is 674.0 mi² (=1745.7 km²), in this year population density was 401.18 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), St. Clair County population in 2026 would be 271,459 [0].
Historical population of St. Clair County for period 1800-2014 [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
[1800-1810] +13.96 %/yr
[1810-1820] +0.48 %/yr
[1820-1830] +3.03 %/yr
[1830-1840] +6.77 %/yr
[1840-1850] +4 %/yr
[1850-1860] +6.45 %/yr
[1860-1870] +3.08 %/yr
[1870-1880] +1.93 %/yr
[1880-1890] +0.75 %/yr
[1890-1900] +2.68 %/yr
[1900-1910] +3.29 %/yr
[1910-1920] +1.31 %/yr
[1920-1930] +1.46 %/yr
[1930-1940] +0.56 %/yr
[1940-1950] +2.13 %/yr
[1950-1960] +2.45 %/yr
[1960-1970] +0.83 %/yr
[1970-1980] -0.64 %/yr
[1980-1990] -0.18 %/yr
[1990-2000] -0.26 %/yr
[2000-2005] +0.4 %/yr
[2005-2010] +0.66 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in St. Clair County? Visit this page: Settlements in St. Clair County, IL
Population of St. Clair County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 8701 | 8252 | 16,953 |
| 5 to 9 | 9299 | 8862 | 18,161 |
| 10 to 14 | 9205 | 8859 | 18,064 |
| 15 to 19 | 8789 | 8524 | 17,313 |
| 20 to 24 | 8943 | 8813 | 17,756 |
| 25 to 29 | 8408 | 8834 | 17,242 |
| 30 to 34 | 8406 | 9073 | 17,479 |
| 35 to 39 | 8007 | 8656 | 16,663 |
| 40 to 44 | 8044 | 8866 | 16,910 |
| 45 to 49 | 8427 | 8997 | 17,424 |
| 50 to 54 | 9669 | 10334 | 20,003 |
| 55 to 59 | 9157 | 10055 | 19,212 |
| 60 to 64 | 7444 | 8357 | 15,801 |
| 65 to 69 | 5609 | 6282 | 11,891 |
| 70 to 74 | 3715 | 4524 | 8,239 |
| 75 to 79 | 2602 | 3667 | 6,269 |
| 80 to 84 | 1925 | 3177 | 5,102 |
| 85+ | 1677 | 3570 | 5,247 |
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 |
| NH | 122777 | 132730 | 255,507 |
| WAC | 88916 | 91089 | 180,005 |
| WA | 86365 | 88326 | 174,691 |
| NHWAC | 84283 | 86760 | 171,043 |
| NHWA | 81973 | 84233 | 166,206 |
| BAC | 38471 | 45342 | 83,813 |
| NHBAC | 37951 | 44814 | 82,765 |
| BA | 36814 | 43513 | 80,327 |
| NHBA | 36432 | 43124 | 79,556 |
| H | 5250 | 4972 | 10,222 |
| HWAC | 4633 | 4329 | 8,962 |
| HWA | 4392 | 4093 | 8,485 |
| TOM | 2842 | 3098 | 5,940 |
| AAC | 2416 | 3247 | 5,663 |
| NHAAC | 2312 | 3118 | 5,430 |
| NHTOM | 2583 | 2837 | 5,420 |
| AA | 1440 | 2197 | 3,637 |
| NHAA | 1380 | 2119 | 3,499 |
| IAC | 1022 | 1178 | 2,200 |
| NHIAC | 776 | 950 | 1,726 |
| HBAC | 520 | 528 | 1,048 |
| IA | 424 | 436 | 860 |
| HBA | 382 | 389 | 771 |
| NHIA | 282 | 308 | 590 |
| HTOM | 259 | 261 | 520 |
| NAC | 267 | 251 | 518 |
| HIAC | 246 | 228 | 474 |
| NHNAC | 234 | 211 | 445 |
| NA | 142 | 132 | 274 |
| HIA | 142 | 128 | 270 |
| NHNA | 127 | 109 | 236 |
| HAAC | 104 | 129 | 233 |
| HAA | 60 | 78 | 138 |
| HNAC | 33 | 40 | 73 |
| HNA | 15 | 23 | 38 |
• St. Louis County population
30.3 mi, 
292°
• St. Louis city
20.6 mi, 
303°
• Madison County
24.7 mi, 
3°
• Jefferson County
36.4 mi, 
246°
• Clinton County
28.7 mi, 
70°
• Randolph County
29.2 mi, 
168°
• Monroe County
19 mi, 
225°
• Perry County
40.4 mi, 
131°
• Bond County
39.1 mi, 
42°
• Washington County
28.8 mi, 
106°
[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 1 Illinois Notes
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