Last official estimated population of Hamilton County was 802,298 (year 2014)[1]. This was 0.252% of total US population and 6.9% of total Ohio state population. Area of Hamilton County is 412.6 mi² (=1068.7 km²), in this year population density was 1,944.36 p/mi². If population growth rate would be same as in period 2010-2014 (-0%/yr), Hamilton County population in 2025 would be 802,089 [0].
Historical population of Hamilton County for period 1800-2014 [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

[1800-1810] +0.38 %/yr
[1810-1820] +7.61 %/yr
[1820-1830] +5.12 %/yr
[1830-1840] +4.36 %/yr
[1840-1850] +6.94 %/yr
[1850-1860] +3.27 %/yr
[1860-1870] +1.87 %/yr
[1870-1880] +1.87 %/yr
[1880-1890] +1.8 %/yr
[1890-1900] +0.89 %/yr
[1900-1910] +1.19 %/yr
[1910-1920] +0.69 %/yr
[1920-1930] +1.79 %/yr
[1930-1940] +0.54 %/yr
[1940-1950] +1.53 %/yr
[1950-1960] +1.79 %/yr
[1960-1970] +0.67 %/yr
[1970-1980] -0.56 %/yr
[1980-1990] -0.08 %/yr
[1990-2000] -0.24 %/yr
[2000-2005] -0.84 %/yr
[2005-2010] -0.2 %/yr
[2010-2014] -0 %/yr
Looking for settlements in Hamilton County? Visit this page: Settlements in Hamilton County, OH
Population of Hamilton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 27357 | 26258 | 53,615 |
| 5 to 9 | 26335 | 26048 | 52,383 |
| 10 to 14 | 25925 | 25258 | 51,183 |
| 15 to 19 | 26999 | 25505 | 52,504 |
| 20 to 24 | 27872 | 28162 | 56,034 |
| 25 to 29 | 30815 | 31965 | 62,780 |
| 30 to 34 | 26747 | 28299 | 55,046 |
| 35 to 39 | 22963 | 23995 | 46,958 |
| 40 to 44 | 22921 | 24253 | 47,174 |
| 45 to 49 | 24529 | 26195 | 50,724 |
| 50 to 54 | 27851 | 29882 | 57,733 |
| 55 to 59 | 27455 | 30295 | 57,750 |
| 60 to 64 | 22834 | 25634 | 48,468 |
| 65 to 69 | 16651 | 19431 | 36,082 |
| 70 to 74 | 11185 | 14252 | 25,437 |
| 75 to 79 | 8016 | 11413 | 19,429 |
| 80 to 84 | 5978 | 9762 | 15,740 |
| 85+ | 5703 | 11888 | 17,591 |
Hamilton 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 | 376007 | 407198 | 783,205 |
| WAC | 279890 | 292677 | 572,567 |
| WA | 271978 | 284346 | 556,324 |
| NHWAC | 269819 | 283345 | 553,164 |
| NHWA | 262507 | 275596 | 538,103 |
| BAC | 102599 | 120270 | 222,869 |
| NHBAC | 100944 | 118605 | 219,549 |
| BA | 96638 | 113859 | 210,497 |
| NHBA | 95435 | 112653 | 208,088 |
| H | 12129 | 11297 | 23,426 |
| AAC | 11400 | 11739 | 23,139 |
| NHAAC | 11174 | 11490 | 22,664 |
| HWAC | 10071 | 9332 | 19,403 |
| AA | 9333 | 9634 | 18,967 |
| NHAA | 9232 | 9498 | 18,730 |
| HWA | 9471 | 8750 | 18,221 |
| TOM | 8724 | 9249 | 17,973 |
| NHTOM | 8053 | 8604 | 16,657 |
| IAC | 3174 | 3441 | 6,615 |
| NHIAC | 2418 | 2787 | 5,205 |
| HBAC | 1655 | 1665 | 3,320 |
| HBA | 1203 | 1206 | 2,409 |
| IA | 1006 | 988 | 1,994 |
| HIAC | 756 | 654 | 1,410 |
| NAC | 681 | 656 | 1,337 |
| HTOM | 671 | 645 | 1,316 |
| NHIA | 528 | 597 | 1,125 |
| NHNAC | 443 | 448 | 891 |
| NA | 457 | 419 | 876 |
| HIA | 478 | 391 | 869 |
| NHNA | 252 | 250 | 502 |
| HAAC | 226 | 249 | 475 |
| HNAC | 238 | 208 | 446 |
| HNA | 205 | 169 | 374 |
| HAA | 101 | 136 | 237 |
• Butler County population
16.8 mi,
356°
• Warren County
25.5 mi,
51°
• Clermont County
23.4 mi,
115°
• Kenton County
18.4 mi,
178°
• Boone County
18.4 mi,
213°
• Campbell County
19.4 mi,
152°
• Dearborn County
23.2 mi,
261°
• Franklin County
31.6 mi,
297°
• Gallatin County
34.7 mi,
209°
• Ohio County
28.7 mi,
231°
[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 1 Ohio Notes
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