Last official estimated population of Hardin County was 32,102 (year 2014)[1]. This was 0.01% of total US population and 0.3% of total Ohio state population. Area of Hardin County is 470.6 mi² (=1219 km²), in this year population density was 68.21 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), Hardin County population in 2024 would be 32,212 [0].
Historical population of Hardin 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] +25.31 %/yr
[1830-1840] +36.16 %/yr
[1840-1850] +6.02 %/yr
[1850-1860] +5.1 %/yr
[1860-1870] +3.27 %/yr
[1870-1880] +3.74 %/yr
[1880-1890] +0.69 %/yr
[1890-1900] +0.75 %/yr
[1900-1910] -0.25 %/yr
[1910-1920] -0.42 %/yr
[1920-1930] -0.54 %/yr
[1930-1940] -0.21 %/yr
[1940-1950] +0.58 %/yr
[1950-1960] +0.33 %/yr
[1960-1970] +0.39 %/yr
[1970-1980] +0.6 %/yr
[1980-1990] -0.5 %/yr
[1990-2000] +0.27 %/yr
[2000-2005] +0.01 %/yr
[2005-2010] +0.05 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in Hardin County? Visit this page: Settlements in Hardin County, OH
Population of Hardin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 954 | 924 | 1,878 |
| 5 to 9 | 1090 | 965 | 2,055 |
| 10 to 14 | 1150 | 1033 | 2,183 |
| 15 to 19 | 1355 | 1395 | 2,750 |
| 20 to 24 | 1869 | 1827 | 3,696 |
| 25 to 29 | 818 | 751 | 1,569 |
| 30 to 34 | 822 | 850 | 1,672 |
| 35 to 39 | 843 | 864 | 1,707 |
| 40 to 44 | 934 | 943 | 1,877 |
| 45 to 49 | 922 | 925 | 1,847 |
| 50 to 54 | 1040 | 1005 | 2,045 |
| 55 to 59 | 999 | 1019 | 2,018 |
| 60 to 64 | 889 | 935 | 1,824 |
| 65 to 69 | 698 | 780 | 1,478 |
| 70 to 74 | 567 | 602 | 1,169 |
| 75 to 79 | 363 | 495 | 858 |
| 80 to 84 | 254 | 343 | 597 |
| 85+ | 173 | 400 | 573 |
Hardin 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 | 15452 | 15858 | 31,310 |
| WAC | 15411 | 15732 | 31,143 |
| NHWAC | 15155 | 15551 | 30,706 |
| WA | 15173 | 15529 | 30,702 |
| NHWA | 14944 | 15357 | 30,301 |
| BAC | 309 | 226 | 535 |
| NHBAC | 283 | 218 | 501 |
| H | 288 | 198 | 486 |
| TOM | 248 | 213 | 461 |
| HWAC | 256 | 181 | 437 |
| NHTOM | 220 | 203 | 423 |
| HWA | 229 | 172 | 401 |
| AAC | 132 | 187 | 319 |
| BA | 184 | 123 | 307 |
| NHAAC | 123 | 184 | 307 |
| NHBA | 172 | 121 | 293 |
| IAC | 127 | 115 | 242 |
| AA | 89 | 149 | 238 |
| NHAA | 85 | 147 | 232 |
| NHIAC | 105 | 105 | 210 |
| IA | 34 | 33 | 67 |
| NHIA | 25 | 27 | 52 |
| NAC | 24 | 18 | 42 |
| HTOM | 28 | 10 | 38 |
| HBAC | 26 | 8 | 34 |
| HIAC | 22 | 10 | 32 |
| NHNAC | 18 | 11 | 29 |
| NA | 12 | 9 | 21 |
| HIA | 9 | 6 | 15 |
| HBA | 12 | 2 | 14 |
| HNAC | 6 | 7 | 13 |
| HAAC | 9 | 3 | 12 |
| HNA | 6 | 6 | 12 |
| NHNA | 6 | 3 | 9 |
| HAA | 4 | 2 | 6 |
• Allen County population
24.4 mi, 
288°
• Hancock County
23.5 mi, 
359°
• Marion County
26.4 mi, 
100°
• Union County
29.6 mi, 
148°
• Shelby County
36.1 mi, 
231°
• Auglaize County
30.2 mi, 
256°
• Logan County
19.6 mi, 
195°
• Champaign County
36.9 mi, 
188°
• Putnam County
35 mi, 
315°
• Wyandot County
22.1 mi, 
55°
[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 7 Ohio Notes
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