Last official estimated population of Clark County was 16,296 (year 2014)[1]. This was 0.005% of total US population and 0.1% of total Illinois state population. Area of Clark County is 504.8 mi² (=1307.5 km²), in this year population density was 32.28 p/mi². If population growth rate would be same as in period 2010-2014 (-0.06%/yr), Clark County population in 2026 would be 16,180 [0].
Historical population of Clark County for period 1820-2014 [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
[1820-1830] +15.52 %/yr
[1830-1840] +6.58 %/yr
[1840-1850] +2.49 %/yr
[1850-1860] +4.63 %/yr
[1860-1870] +2.25 %/yr
[1870-1880] +1.58 %/yr
[1880-1890] +0 %/yr
[1890-1900] +0.93 %/yr
[1900-1910] -0.22 %/yr
[1910-1920] -1.05 %/yr
[1920-1930] -1.68 %/yr
[1930-1940] +0.53 %/yr
[1940-1950] -0.81 %/yr
[1950-1960] -0.48 %/yr
[1960-1970] -0.2 %/yr
[1970-1980] +0.42 %/yr
[1980-1990] -0.6 %/yr
[1990-2000] +0.65 %/yr
[2000-2005] -0.32 %/yr
[2005-2010] -0.47 %/yr
[2010-2014] -0.06 %/yr
Looking for settlements in Clark County? Visit this page: Settlements in Clark County, IL
Population of Clark County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 477 | 469 | 946 |
| 5 to 9 | 532 | 500 | 1,032 |
| 10 to 14 | 539 | 505 | 1,044 |
| 15 to 19 | 502 | 517 | 1,019 |
| 20 to 24 | 458 | 449 | 907 |
| 25 to 29 | 471 | 435 | 906 |
| 30 to 34 | 458 | 471 | 929 |
| 35 to 39 | 427 | 439 | 866 |
| 40 to 44 | 520 | 480 | 1,000 |
| 45 to 49 | 532 | 526 | 1,058 |
| 50 to 54 | 616 | 623 | 1,239 |
| 55 to 59 | 608 | 544 | 1,152 |
| 60 to 64 | 538 | 524 | 1,062 |
| 65 to 69 | 385 | 461 | 846 |
| 70 to 74 | 353 | 413 | 766 |
| 75 to 79 | 255 | 280 | 535 |
| 80 to 84 | 140 | 264 | 404 |
| 85+ | 142 | 327 | 469 |
Clark 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 | 7873 | 8126 | 15,999 |
| NH | 7827 | 8123 | 15,950 |
| WA | 7814 | 8066 | 15,880 |
| NHWAC | 7750 | 8027 | 15,777 |
| NHWA | 7694 | 7971 | 15,665 |
| H | 126 | 104 | 230 |
| HWAC | 123 | 99 | 222 |
| HWA | 120 | 95 | 215 |
| BAC | 74 | 61 | 135 |
| TOM | 62 | 72 | 134 |
| NHBAC | 71 | 58 | 129 |
| NHTOM | 59 | 67 | 126 |
| AAC | 30 | 60 | 90 |
| NHAAC | 30 | 57 | 87 |
| IAC | 39 | 46 | 85 |
| NHIAC | 36 | 43 | 79 |
| BA | 48 | 28 | 76 |
| NHBA | 46 | 26 | 72 |
| AA | 13 | 42 | 55 |
| NHAA | 13 | 40 | 53 |
| IA | 15 | 18 | 33 |
| NHIA | 14 | 18 | 32 |
| NAC | 3 | 8 | 11 |
| NHNAC | 3 | 7 | 10 |
| HTOM | 3 | 5 | 8 |
| HIAC | 3 | 3 | 6 |
| HBAC | 3 | 3 | 6 |
| HBA | 2 | 2 | 4 |
| HAAC | 0 | 3 | 3 |
| NA | 1 | 1 | 2 |
| NHNA | 1 | 1 | 2 |
| HAA | 0 | 2 | 2 |
| HIA | 1 | 0 | 1 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
• Vigo County population
22.5 mi, 
72°
• Coles County
26.1 mi, 
298°
• Clay County
36.4 mi, 
83°
• Sullivan County
26.2 mi, 
129°
• Douglas County
37.8 mi, 
322°
• Crawford County
22.8 mi, 
175°
• Edgar County
24.1 mi, 
5°
• Vermillion County
40.1 mi, 
25°
• Cumberland County
24.3 mi, 
260°
• Jasper County
29.7 mi, 
220°
[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
*St. Clair; Randolph Illinois Notes
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