Last official estimated population of Clinton County was 41,892 (year 2014)[1]. This was 0.013% of total US population and 0.4% of total Ohio state population. Area of Clinton County is 412.3 mi² (=1067.8 km²), in this year population density was 101.61 p/mi². If population growth rate would be same as in period 2010-2014 (-0.09%/yr), Clinton County population in 2024 would be 41,524 [0].
Historical population of Clinton County for period 1810-2014 [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
[1810-1820] +11.7 %/yr
[1820-1830] +3.53 %/yr
[1830-1840] +3.23 %/yr
[1840-1850] +1.83 %/yr
[1850-1860] +1.31 %/yr
[1860-1870] +0.21 %/yr
[1870-1880] +1.23 %/yr
[1880-1890] -0.21 %/yr
[1890-1900] -0.02 %/yr
[1900-1910] -0.22 %/yr
[1910-1920] -0.28 %/yr
[1920-1930] -0.67 %/yr
[1930-1940] +0.47 %/yr
[1940-1950] +1.25 %/yr
[1950-1960] +1.61 %/yr
[1960-1970] +0.48 %/yr
[1970-1980] +0.96 %/yr
[1980-1990] +0.24 %/yr
[1990-2000] +1.34 %/yr
[2000-2005] +0.64 %/yr
[2005-2010] +0.13 %/yr
[2010-2014] -0.09 %/yr
Looking for settlements in Clinton County? Visit this page: Settlements in Clinton County, OH
Population of Clinton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1443 | 1222 | 2,665 |
| 5 to 9 | 1412 | 1289 | 2,701 |
| 10 to 14 | 1478 | 1406 | 2,884 |
| 15 to 19 | 1512 | 1468 | 2,980 |
| 20 to 24 | 1370 | 1359 | 2,729 |
| 25 to 29 | 1144 | 1203 | 2,347 |
| 30 to 34 | 1261 | 1240 | 2,501 |
| 35 to 39 | 1164 | 1255 | 2,419 |
| 40 to 44 | 1281 | 1318 | 2,599 |
| 45 to 49 | 1350 | 1343 | 2,693 |
| 50 to 54 | 1515 | 1574 | 3,089 |
| 55 to 59 | 1590 | 1640 | 3,230 |
| 60 to 64 | 1274 | 1348 | 2,622 |
| 65 to 69 | 1073 | 1106 | 2,179 |
| 70 to 74 | 722 | 804 | 1,526 |
| 75 to 79 | 471 | 622 | 1,093 |
| 80 to 84 | 335 | 463 | 798 |
| 85+ | 263 | 517 | 780 |
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 | 20235 | 20911 | 41,146 |
| WAC | 19977 | 20492 | 40,469 |
| NHWAC | 19586 | 20264 | 39,850 |
| WA | 19586 | 20115 | 39,701 |
| NHWA | 19209 | 19894 | 39,103 |
| BAC | 757 | 715 | 1,472 |
| NHBAC | 733 | 686 | 1,419 |
| BA | 502 | 455 | 957 |
| NHBA | 488 | 434 | 922 |
| TOM | 416 | 404 | 820 |
| NHTOM | 401 | 395 | 796 |
| H | 423 | 266 | 689 |
| HWAC | 391 | 228 | 619 |
| HWA | 377 | 221 | 598 |
| AAC | 145 | 206 | 351 |
| NHAAC | 142 | 200 | 342 |
| IAC | 179 | 161 | 340 |
| NHIAC | 161 | 151 | 312 |
| AA | 83 | 140 | 223 |
| NHAA | 82 | 136 | 218 |
| IA | 58 | 55 | 113 |
| NHIA | 45 | 46 | 91 |
| HBAC | 24 | 29 | 53 |
| NAC | 25 | 16 | 41 |
| NHNAC | 22 | 14 | 36 |
| HBA | 14 | 21 | 35 |
| HIAC | 18 | 10 | 28 |
| HTOM | 15 | 9 | 24 |
| HIA | 13 | 9 | 22 |
| NA | 13 | 8 | 21 |
| NHNA | 10 | 6 | 16 |
| HAAC | 3 | 6 | 9 |
| HNAC | 3 | 2 | 5 |
| HNA | 3 | 2 | 5 |
| HAA | 1 | 4 | 5 |
• Montgomery County population
34.6 mi, 
310°
• Warren County
20 mi, 
269°
• Clermont County
32.2 mi, 
216°
• Greene County
18.6 mi, 
343°
• Clark County
33.7 mi, 
1°
• Ross County
39.9 mi, 
100°
• Brown County
34.6 mi, 
186°
• Highland County
19.8 mi, 
148°
• Madison County
38.5 mi, 
32°
• Fayette County
19.8 mi, 
63°
[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
*Hamilton, Ross Ohio Notes
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