Last official estimated population of Adams County was 3,956 (year 2014)[1]. This was 0.001% of total US population and 0.2% of total Idaho state population. Area of Adams County is 1,369.8 mi² (=3547.7 km²), in this year population density was 2.89 p/mi². If population growth rate would be same as in period 2010-2014 (-0.13%/yr), Adams County population in 2026 would be 3,897 [0].
Historical population of Adams County for period 1920-2014 [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
[1920-1930] -0.34 %/yr
[1930-1940] +1.74 %/yr
[1940-1950] -0.18 %/yr
[1950-1960] -1.16 %/yr
[1960-1970] -0.34 %/yr
[1970-1980] +1.52 %/yr
[1980-1990] -0.28 %/yr
[1990-2000] +0.68 %/yr
[2000-2005] +1.85 %/yr
[2005-2010] +0.82 %/yr
[2010-2014] -0.13 %/yr
Looking for settlements in Adams County? Visit this page: Settlements in Adams County, ID
Population of Adams County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 88 | 73 | 161 |
| 5 to 9 | 89 | 92 | 181 |
| 10 to 14 | 85 | 102 | 187 |
| 15 to 19 | 100 | 90 | 190 |
| 20 to 24 | 81 | 72 | 153 |
| 25 to 29 | 86 | 76 | 162 |
| 30 to 34 | 72 | 83 | 155 |
| 35 to 39 | 83 | 79 | 162 |
| 40 to 44 | 91 | 90 | 181 |
| 45 to 49 | 92 | 99 | 191 |
| 50 to 54 | 148 | 161 | 309 |
| 55 to 59 | 204 | 214 | 418 |
| 60 to 64 | 240 | 208 | 448 |
| 65 to 69 | 186 | 156 | 342 |
| 70 to 74 | 165 | 123 | 288 |
| 75 to 79 | 110 | 79 | 189 |
| 80 to 84 | 44 | 52 | 96 |
| 85+ | 24 | 24 | 48 |
Adams 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 | 1956 | 1833 | 3,789 |
| NH | 1925 | 1812 | 3,737 |
| WA | 1924 | 1799 | 3,723 |
| NHWAC | 1896 | 1776 | 3,672 |
| NHWA | 1869 | 1746 | 3,615 |
| H | 63 | 61 | 124 |
| HWAC | 60 | 57 | 117 |
| HWA | 55 | 53 | 108 |
| IAC | 35 | 43 | 78 |
| TOM | 33 | 35 | 68 |
| NHIAC | 29 | 36 | 65 |
| NHTOM | 28 | 31 | 59 |
| IA | 17 | 23 | 40 |
| NHIA | 14 | 20 | 34 |
| AAC | 14 | 17 | 31 |
| NHAAC | 13 | 17 | 30 |
| BAC | 12 | 15 | 27 |
| NHBAC | 11 | 14 | 25 |
| NHAA | 6 | 12 | 18 |
| AA | 6 | 12 | 18 |
| HIAC | 6 | 7 | 13 |
| BA | 6 | 3 | 9 |
| HTOM | 5 | 4 | 9 |
| NHBA | 6 | 2 | 8 |
| NAC | 4 | 3 | 7 |
| NHNAC | 4 | 3 | 7 |
| HIA | 3 | 3 | 6 |
| NA | 2 | 1 | 3 |
| NHNA | 2 | 1 | 3 |
| HBAC | 1 | 1 | 2 |
| HAAC | 1 | 0 | 1 |
| HBA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Canyon County population
87.5 mi, 
188°
• Union County
80.6 mi, 
291°
• Payette County
62.1 mi, 193°
• Gem County
56.4 mi, 
176°
• Idaho County
82.7 mi, 
35°
• Baker County
61.5 mi, 
258°
• Washington County
33.9 mi, 
209°
• Valley County
41 mi, 
100°
• Wallowa County
60.8 mi, 
324°
• Boise County
71.7 mi, 
149°
[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
*Washington Idaho Notes
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