Last official estimated population of Hamilton County was 8,449 (year 2014)[1]. This was 0.003% of total US population and 0.1% of total Illinois state population. Area of Hamilton County is 435.9 mi² (=1129 km²), in this year population density was 19.38 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Hamilton County population in 2026 would be 8,425 [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] +4.19 %/yr
[1840-1850] +4.89 %/yr
[1850-1860] +4.54 %/yr
[1860-1870] +2.76 %/yr
[1870-1880] +2.53 %/yr
[1880-1890] +0.63 %/yr
[1890-1900] +1.27 %/yr
[1900-1910] -1.02 %/yr
[1910-1920] -1.34 %/yr
[1920-1930] -2.01 %/yr
[1930-1940] +0.35 %/yr
[1940-1950] -0.93 %/yr
[1950-1960] -2 %/yr
[1960-1970] -1.43 %/yr
[1970-1980] +0.57 %/yr
[1980-1990] -0.76 %/yr
[1990-2000] +0.13 %/yr
[2000-2005] -0.33 %/yr
[2005-2010] -0.03 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Hamilton County? Visit this page: Settlements in Hamilton County, IL
Population of Hamilton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 232 | 227 | 459 |
| 5 to 9 | 262 | 263 | 525 |
| 10 to 14 | 293 | 268 | 561 |
| 15 to 19 | 254 | 223 | 477 |
| 20 to 24 | 224 | 219 | 443 |
| 25 to 29 | 178 | 211 | 389 |
| 30 to 34 | 245 | 262 | 507 |
| 35 to 39 | 239 | 223 | 462 |
| 40 to 44 | 237 | 243 | 480 |
| 45 to 49 | 255 | 256 | 511 |
| 50 to 54 | 297 | 288 | 585 |
| 55 to 59 | 323 | 334 | 657 |
| 60 to 64 | 282 | 280 | 562 |
| 65 to 69 | 240 | 239 | 479 |
| 70 to 74 | 193 | 218 | 411 |
| 75 to 79 | 144 | 173 | 317 |
| 80 to 84 | 88 | 113 | 201 |
| 85+ | 77 | 193 | 270 |
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 | 4015 | 4176 | 8,191 |
| NH | 3994 | 4173 | 8,167 |
| WA | 3981 | 4138 | 8,119 |
| NHWAC | 3955 | 4128 | 8,083 |
| NHWA | 3922 | 4090 | 8,012 |
| H | 69 | 60 | 129 |
| HWAC | 60 | 48 | 108 |
| HWA | 59 | 48 | 107 |
| BAC | 40 | 45 | 85 |
| NHBAC | 39 | 45 | 84 |
| TOM | 35 | 41 | 76 |
| NHTOM | 34 | 41 | 75 |
| IAC | 29 | 30 | 59 |
| NHBA | 29 | 23 | 52 |
| BA | 29 | 23 | 52 |
| NHIAC | 21 | 18 | 39 |
| NHAAC | 13 | 24 | 37 |
| AAC | 13 | 24 | 37 |
| IA | 12 | 17 | 29 |
| HIA | 8 | 12 | 20 |
| HIAC | 8 | 12 | 20 |
| AA | 5 | 14 | 19 |
| NHAA | 5 | 14 | 19 |
| NHIA | 4 | 5 | 9 |
| NAC | 3 | 0 | 3 |
| NHNAC | 2 | 0 | 2 |
| HNAC | 1 | 0 | 1 |
| NA | 1 | 0 | 1 |
| HBAC | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| HTOM | 1 | 0 | 1 |
| NHNA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Williamson County population
32.5 mi, 
221°
• Franklin County
22 mi, 
252°
• Jefferson County
25.7 mi, 
305°
• Posey County
36.7 mi, 
96°
• Saline County
23 mi, 
180°
• Wayne County
24.6 mi, 
13°
• White County
19.6 mi, 
89°
• Edwards County
35.2 mi, 
49°
• Gallatin County
27.7 mi, 
142°
• Hardin County
41.9 mi, 
159°
[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
*White Illinois Notes
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