Last official estimated population of Hamilton County was 276,377 (year 2014)[1]. This was 0.087% of total US population and 4.2% of total Indiana state population. Area of Hamilton County is 402.4 mi² (=1042.3 km²), in this year population density was 686.76 p/mi². If population growth rate would be same as in period 2010-2014 (+0.16%/yr), Hamilton County population in 2024 would be 280,949 [0].
Historical population of Hamilton County for period 1830-2014 [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
[1830-1840] +18.82 %/yr
[1840-1850] +2.56 %/yr
[1850-1860] +3.16 %/yr
[1860-1870] +1.89 %/yr
[1870-1880] +1.73 %/yr
[1880-1890] +0.52 %/yr
[1890-1900] +1.36 %/yr
[1900-1910] -1.01 %/yr
[1910-1920] -1.09 %/yr
[1920-1930] -0.33 %/yr
[1930-1940] +0.49 %/yr
[1940-1950] +1.47 %/yr
[1950-1960] +3.49 %/yr
[1960-1970] +3.11 %/yr
[1970-1980] +4.17 %/yr
[1980-1990] +2.88 %/yr
[1990-2000] +5.31 %/yr
[2000-2005] +5.16 %/yr
[2005-2010] +3.16 %/yr
[2010-2014] +0.16 %/yr
Looking for settlements in Hamilton County? Visit this page: Settlements in Hamilton County, IN
Population of Hamilton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 10490 | 10016 | 20,506 |
| 5 to 9 | 12637 | 12275 | 24,912 |
| 10 to 14 | 13275 | 12807 | 26,082 |
| 15 to 19 | 11172 | 10589 | 21,761 |
| 20 to 24 | 7365 | 7144 | 14,509 |
| 25 to 29 | 7488 | 8553 | 16,041 |
| 30 to 34 | 10072 | 11206 | 21,278 |
| 35 to 39 | 10780 | 11661 | 22,441 |
| 40 to 44 | 12170 | 12527 | 24,697 |
| 45 to 49 | 11497 | 11896 | 23,393 |
| 50 to 54 | 10928 | 11376 | 22,304 |
| 55 to 59 | 8907 | 9457 | 18,364 |
| 60 to 64 | 7047 | 7724 | 14,771 |
| 65 to 69 | 5557 | 6102 | 11,659 |
| 70 to 74 | 3507 | 4174 | 7,681 |
| 75 to 79 | 2237 | 2838 | 5,075 |
| 80 to 84 | 1364 | 2003 | 3,367 |
| 85+ | 1298 | 2484 | 3,782 |
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 | 142036 | 149161 | 291,197 |
| WAC | 133044 | 139147 | 272,191 |
| WA | 130447 | 136536 | 266,983 |
| NHWAC | 127725 | 133981 | 261,706 |
| NHWA | 125300 | 131560 | 256,860 |
| AAC | 9420 | 10164 | 19,584 |
| NHAAC | 9292 | 10000 | 19,292 |
| AA | 8153 | 8904 | 17,057 |
| NHAA | 8075 | 8812 | 16,887 |
| BAC | 7221 | 7458 | 14,679 |
| NHBAC | 6939 | 7094 | 14,033 |
| BA | 6061 | 6223 | 12,284 |
| NHBA | 5857 | 5958 | 11,815 |
| H | 5755 | 5671 | 11,426 |
| HWAC | 5319 | 5166 | 10,485 |
| HWA | 5147 | 4976 | 10,123 |
| TOM | 2719 | 2760 | 5,479 |
| NHTOM | 2536 | 2550 | 5,086 |
| IAC | 760 | 769 | 1,529 |
| NHIAC | 597 | 609 | 1,206 |
| IA | 332 | 314 | 646 |
| HBAC | 282 | 364 | 646 |
| HBA | 204 | 265 | 469 |
| NHIA | 230 | 226 | 456 |
| HTOM | 183 | 210 | 393 |
| NAC | 175 | 196 | 371 |
| HIAC | 163 | 160 | 323 |
| HAAC | 128 | 164 | 292 |
| NHNAC | 124 | 151 | 275 |
| HIA | 102 | 88 | 190 |
| NA | 79 | 95 | 174 |
| HAA | 78 | 92 | 170 |
| HNAC | 51 | 45 | 96 |
| NHNA | 38 | 55 | 93 |
| HNA | 41 | 40 | 81 |
• Marion County population
19.7 mi, 
197°
• Hendricks County
32.5 mi, 
232°
• Madison County
17.6 mi, 
63°
• Delaware County
35 mi, 
69°
• Howard County
30.1 mi, 
350°
• Hancock County
20.7 mi, 
140°
• Boone County
23.7 mi, 
269°
• Henry County
34.1 mi, 
104°
• Clinton County
29.7 mi, 
305°
• Tipton County
17.8 mi, 354°
[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
*Delaware Indiana Notes
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