Last official estimated population of Clinton County was 37,819 (year 2014)[1]. This was 0.012% of total US population and 0.3% of total Illinois state population. Area of Clinton County is 503.3 mi² (=1303.5 km²), in this year population density was 75.15 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Clinton County population in 2024 would be 37,962 [0].
Historical population of Clinton County for period 1830-2014 [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
[1830-1840] +4.78 %/yr
[1840-1850] +3.29 %/yr
[1850-1860] +7.85 %/yr
[1860-1870] +4.06 %/yr
[1870-1880] +1.4 %/yr
[1880-1890] -0.72 %/yr
[1890-1900] +1.31 %/yr
[1900-1910] +1.42 %/yr
[1910-1920] +0.05 %/yr
[1920-1930] -0.71 %/yr
[1930-1940] +0.7 %/yr
[1940-1950] -0.14 %/yr
[1950-1960] +0.62 %/yr
[1960-1970] +1.65 %/yr
[1970-1980] +1.42 %/yr
[1980-1990] +0.4 %/yr
[1990-2000] +0.46 %/yr
[2000-2005] +0.64 %/yr
[2005-2010] +0.58 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Clinton County? Visit this page: Settlements in Clinton County, IL
Population of Clinton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1100 | 984 | 2,084 |
| 5 to 9 | 1172 | 1074 | 2,246 |
| 10 to 14 | 1188 | 1144 | 2,332 |
| 15 to 19 | 1192 | 1074 | 2,266 |
| 20 to 24 | 1273 | 1088 | 2,361 |
| 25 to 29 | 1417 | 1040 | 2,457 |
| 30 to 34 | 1463 | 1129 | 2,592 |
| 35 to 39 | 1328 | 1049 | 2,377 |
| 40 to 44 | 1282 | 1078 | 2,360 |
| 45 to 49 | 1412 | 1258 | 2,670 |
| 50 to 54 | 1563 | 1457 | 3,020 |
| 55 to 59 | 1409 | 1345 | 2,754 |
| 60 to 64 | 1154 | 1124 | 2,278 |
| 65 to 69 | 848 | 924 | 1,772 |
| 70 to 74 | 653 | 777 | 1,430 |
| 75 to 79 | 484 | 594 | 1,078 |
| 80 to 84 | 352 | 518 | 870 |
| 85+ | 313 | 597 | 910 |
Clinton 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 | 18893 | 17796 | 36,689 |
| WAC | 18253 | 17831 | 36,084 |
| WA | 18062 | 17621 | 35,683 |
| NHWAC | 17625 | 17422 | 35,047 |
| NHWA | 17459 | 17232 | 34,691 |
| BAC | 1274 | 329 | 1,603 |
| NHBAC | 1220 | 303 | 1,523 |
| BA | 1178 | 215 | 1,393 |
| NHBA | 1138 | 202 | 1,340 |
| H | 710 | 458 | 1,168 |
| HWAC | 628 | 409 | 1,037 |
| HWA | 603 | 389 | 992 |
| TOM | 198 | 222 | 420 |
| NHTOM | 173 | 201 | 374 |
| AAC | 119 | 181 | 300 |
| NHAAC | 116 | 179 | 295 |
| IAC | 132 | 119 | 251 |
| AA | 68 | 114 | 182 |
| NHAA | 66 | 114 | 180 |
| NHIAC | 92 | 83 | 175 |
| IA | 80 | 72 | 152 |
| NHIA | 50 | 42 | 92 |
| HBAC | 54 | 26 | 80 |
| HIAC | 40 | 36 | 76 |
| HIA | 30 | 30 | 60 |
| HBA | 40 | 13 | 53 |
| HTOM | 25 | 21 | 46 |
| NAC | 26 | 19 | 45 |
| NHNAC | 16 | 13 | 29 |
| NA | 17 | 10 | 27 |
| HNAC | 10 | 6 | 16 |
| HNA | 10 | 5 | 15 |
| NHNA | 7 | 5 | 12 |
| HAAC | 3 | 2 | 5 |
| HAA | 2 | 0 | 2 |
• St. Clair County population
28.7 mi, 
250°
• Madison County
29.8 mi, 
300°
• Marion County
27.4 mi, 
83°
• Jefferson County
34.4 mi, 
127°
• Randolph County
43.6 mi, 
209°
• Montgomery County
43.1 mi, 
356°
• Perry County
36.2 mi, 
175°
• Fayette County
35 mi, 
38°
• Bond County
19.3 mi, 358°
• Washington County
17.5 mi, 178°
[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
*Washington, Bond Illinois Notes
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