Last official estimated population of Clark County was 138,227 (year 2014)[1]. This was 0.043% of total US population and 1.2% of total Ohio state population. Area of Clark County is 402.5 mi² (=1042.5 km²), in this year population density was 343.40 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Clark County population in 2024 would be 137,962 [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] +3.24 %/yr
[1830-1840] +2.56 %/yr
[1840-1850] +2.77 %/yr
[1850-1860] +1.33 %/yr
[1860-1870] +2.4 %/yr
[1870-1880] +2.72 %/yr
[1880-1890] +2.23 %/yr
[1890-1900] +1.21 %/yr
[1900-1910] +1.2 %/yr
[1910-1920] +1.97 %/yr
[1920-1930] +1.2 %/yr
[1930-1940] +0.51 %/yr
[1940-1950] +1.56 %/yr
[1950-1960] +1.64 %/yr
[1960-1970] +1.8 %/yr
[1970-1980] -0.45 %/yr
[1980-1990] -0.18 %/yr
[1990-2000] -0.19 %/yr
[2000-2005] -0.47 %/yr
[2005-2010] -0.43 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Clark County? Visit this page: Settlements in Clark County, OH
Population of Clark County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4109 | 3882 | 7,991 |
| 5 to 9 | 4531 | 4170 | 8,701 |
| 10 to 14 | 4545 | 4385 | 8,930 |
| 15 to 19 | 4541 | 4465 | 9,006 |
| 20 to 24 | 4246 | 4345 | 8,591 |
| 25 to 29 | 3974 | 4080 | 8,054 |
| 30 to 34 | 3591 | 3948 | 7,539 |
| 35 to 39 | 3648 | 3765 | 7,413 |
| 40 to 44 | 3999 | 4166 | 8,165 |
| 45 to 49 | 4371 | 4472 | 8,843 |
| 50 to 54 | 4782 | 4960 | 9,742 |
| 55 to 59 | 4797 | 5044 | 9,841 |
| 60 to 64 | 4386 | 4900 | 9,286 |
| 65 to 69 | 3686 | 4156 | 7,842 |
| 70 to 74 | 2728 | 3141 | 5,869 |
| 75 to 79 | 1876 | 2422 | 4,298 |
| 80 to 84 | 1226 | 1812 | 3,038 |
| 85+ | 1193 | 2212 | 3,405 |
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 |
| NH | 63953 | 68342 | 132,295 |
| WAC | 59419 | 63079 | 122,498 |
| WA | 57666 | 61278 | 118,944 |
| NHWAC | 57412 | 61316 | 118,728 |
| NHWA | 55802 | 59658 | 115,460 |
| BAC | 7287 | 7648 | 14,935 |
| NHBAC | 7012 | 7414 | 14,426 |
| BA | 6023 | 6322 | 12,345 |
| NHBA | 5851 | 6181 | 12,032 |
| H | 2276 | 1983 | 4,259 |
| HWAC | 2007 | 1763 | 3,770 |
| TOM | 1855 | 1912 | 3,767 |
| HWA | 1864 | 1620 | 3,484 |
| NHTOM | 1693 | 1759 | 3,452 |
| AAC | 669 | 815 | 1,484 |
| IAC | 718 | 721 | 1,439 |
| NHAAC | 638 | 778 | 1,416 |
| NHIAC | 605 | 631 | 1,236 |
| AA | 416 | 563 | 979 |
| NHAA | 402 | 548 | 950 |
| HBAC | 275 | 234 | 509 |
| IA | 225 | 204 | 429 |
| NHIA | 174 | 158 | 332 |
| HTOM | 162 | 153 | 315 |
| HBA | 172 | 141 | 313 |
| NAC | 110 | 106 | 216 |
| HIAC | 113 | 90 | 203 |
| NHNAC | 89 | 86 | 175 |
| HIA | 51 | 46 | 97 |
| NA | 44 | 46 | 90 |
| NHNA | 31 | 38 | 69 |
| HAAC | 31 | 37 | 68 |
| HNAC | 21 | 20 | 41 |
| HAA | 14 | 15 | 29 |
| HNA | 13 | 8 | 21 |
• Montgomery County population
29.2 mi, 
247°
• Greene County
16.9 mi, 
200°
• Miami County
25.4 mi, 
291°
• Union County
34.2 mi, 
40°
• Shelby County
36.5 mi, 
322°
• Logan County
32.5 mi, 
1°
• Madison County
20.3 mi, 
93°
• Clinton County
33.7 mi, 
181°
• Champaign County
14.9 mi, 3°
• Fayette County
30.3 mi, 
145°
[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 4 Ohio Notes
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