Last official estimated population of Hamilton County was 15,630 (year 2014)[1]. This was 0.005% of total US population and 0.5% of total Iowa state population. Area of Hamilton County is 577.5 mi² (=1495.7 km²), in this year population density was 27.06 p/mi². If population growth rate would be same as in period 2010-2014 (-0.07%/yr), Hamilton County population in 2026 would be 15,502 [0].
Historical population of Hamilton County for period 1860-2014 [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
[1860-1870] +13.55 %/yr
[1870-1880] +6.39 %/yr
[1880-1890] +3.13 %/yr
[1890-1900] +2.45 %/yr
[1900-1910] -0.14 %/yr
[1910-1920] +0.15 %/yr
[1920-1930] +0.72 %/yr
[1930-1940] -0.52 %/yr
[1940-1950] -0.13 %/yr
[1950-1960] +0.19 %/yr
[1960-1970] -0.86 %/yr
[1970-1980] -0.29 %/yr
[1980-1990] -1.05 %/yr
[1990-2000] +0.22 %/yr
[2000-2005] -0.21 %/yr
[2005-2010] -0.73 %/yr
[2010-2014] -0.07 %/yr
Looking for settlements in Hamilton County? Visit this page: Settlements in Hamilton County, IA
Population of Hamilton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 405 | 444 | 849 |
| 5 to 9 | 488 | 471 | 959 |
| 10 to 14 | 512 | 478 | 990 |
| 15 to 19 | 530 | 457 | 987 |
| 20 to 24 | 388 | 364 | 752 |
| 25 to 29 | 407 | 385 | 792 |
| 30 to 34 | 473 | 433 | 906 |
| 35 to 39 | 373 | 421 | 794 |
| 40 to 44 | 451 | 412 | 863 |
| 45 to 49 | 474 | 463 | 937 |
| 50 to 54 | 633 | 574 | 1,207 |
| 55 to 59 | 557 | 576 | 1,133 |
| 60 to 64 | 493 | 526 | 1,019 |
| 65 to 69 | 411 | 427 | 838 |
| 70 to 74 | 281 | 303 | 584 |
| 75 to 79 | 211 | 292 | 503 |
| 80 to 84 | 165 | 264 | 429 |
| 85+ | 194 | 381 | 575 |
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 |
| WAC | 7192 | 7411 | 14,603 |
| WA | 7104 | 7316 | 14,420 |
| NH | 7033 | 7266 | 14,299 |
| NHWAC | 6817 | 7042 | 13,859 |
| NHWA | 6741 | 6961 | 13,702 |
| H | 413 | 405 | 818 |
| HWAC | 375 | 369 | 744 |
| HWA | 363 | 355 | 718 |
| AAC | 181 | 191 | 372 |
| NHAAC | 177 | 187 | 364 |
| AA | 157 | 168 | 325 |
| NHAA | 154 | 167 | 321 |
| BAC | 91 | 105 | 196 |
| TOM | 91 | 103 | 194 |
| NHTOM | 79 | 89 | 168 |
| NHBAC | 72 | 78 | 150 |
| IAC | 70 | 62 | 132 |
| BA | 59 | 58 | 117 |
| NHIAC | 45 | 44 | 89 |
| NHBA | 42 | 36 | 78 |
| IA | 34 | 26 | 60 |
| HBAC | 19 | 27 | 46 |
| HIAC | 25 | 18 | 43 |
| HBA | 17 | 22 | 39 |
| NHIA | 17 | 13 | 30 |
| HIA | 17 | 13 | 30 |
| HTOM | 12 | 14 | 26 |
| NAC | 7 | 7 | 14 |
| NHNAC | 5 | 6 | 11 |
| HAAC | 4 | 4 | 8 |
| HAA | 3 | 1 | 4 |
| HNAC | 2 | 1 | 3 |
| NA | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| NHNA | 0 | 0 | 0 |
• Story County population
27.4 mi, 
152°
• Marshall County
44.4 mi, 
122°
• Webster County
24 mi, 
277°
• Boone County
27 mi, 
205°
• Hardin County
23.9 mi, 
90°
• Wright County
23.7 mi, 
356°
• Grundy County
46.9 mi, 88°
• Franklin County
32.7 mi, 
42°
• Humboldt County
36.9 mi, 
317°
• Greene County
42.3 mi, 
235°
[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
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