Last official estimated population of Adams County was 4,023 (year 2014)[1]. This was 0.001% of total US population and 0.1% of total Iowa state population. Area of Adams County is 425.5 mi² (=1102.1 km²), in this year population density was 9.45 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Adams County population in 2024 would be 4,008 [0].
Historical population of Adams 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] +11.65 %/yr
[1870-1880] +9.93 %/yr
[1880-1890] +0.33 %/yr
[1890-1900] +1.02 %/yr
[1900-1910] -2.1 %/yr
[1910-1920] -0.44 %/yr
[1920-1930] -0.08 %/yr
[1930-1940] -0.27 %/yr
[1940-1950] -1.48 %/yr
[1950-1960] -1.58 %/yr
[1960-1970] -1.65 %/yr
[1970-1980] -0.98 %/yr
[1980-1990] -1.62 %/yr
[1990-2000] -0.83 %/yr
[2000-2005] -1.16 %/yr
[2005-2010] -0.95 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Adams County? Visit this page: Settlements in Adams County, IA
Population of Adams County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 146 | 104 | 250 |
| 5 to 9 | 109 | 118 | 227 |
| 10 to 14 | 118 | 96 | 214 |
| 15 to 19 | 112 | 102 | 214 |
| 20 to 24 | 79 | 99 | 178 |
| 25 to 29 | 109 | 102 | 211 |
| 30 to 34 | 115 | 104 | 219 |
| 35 to 39 | 85 | 97 | 182 |
| 40 to 44 | 112 | 86 | 198 |
| 45 to 49 | 100 | 113 | 213 |
| 50 to 54 | 167 | 162 | 329 |
| 55 to 59 | 167 | 166 | 333 |
| 60 to 64 | 130 | 124 | 254 |
| 65 to 69 | 113 | 125 | 238 |
| 70 to 74 | 100 | 104 | 204 |
| 75 to 79 | 65 | 79 | 144 |
| 80 to 84 | 69 | 74 | 143 |
| 85+ | 44 | 80 | 124 |
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 |
| NH | 1918 | 1915 | 3,833 |
| WAC | 1911 | 1907 | 3,818 |
| WA | 1898 | 1892 | 3,790 |
| NHWAC | 1890 | 1891 | 3,781 |
| NHWA | 1877 | 1876 | 3,753 |
| H | 22 | 20 | 42 |
| HWAC | 21 | 16 | 37 |
| HWA | 21 | 16 | 37 |
| AAC | 16 | 16 | 32 |
| NHAAC | 16 | 15 | 31 |
| TOM | 14 | 15 | 29 |
| BAC | 13 | 16 | 29 |
| NHTOM | 13 | 15 | 28 |
| NHBAC | 12 | 14 | 26 |
| IAC | 13 | 12 | 25 |
| AA | 11 | 13 | 24 |
| NHIAC | 12 | 11 | 23 |
| NHAA | 11 | 12 | 23 |
| IA | 9 | 7 | 16 |
| NHIA | 9 | 6 | 15 |
| BA | 7 | 8 | 15 |
| NHBA | 7 | 6 | 13 |
| HBAC | 1 | 2 | 3 |
| NHNAC | 1 | 1 | 2 |
| HIAC | 1 | 1 | 2 |
| NAC | 1 | 1 | 2 |
| HBA | 0 | 2 | 2 |
| HTOM | 1 | 0 | 1 |
| NHNA | 1 | 0 | 1 |
| NA | 1 | 0 | 1 |
| HAA | 0 | 1 | 1 |
| HAAC | 0 | 1 | 1 |
| HIA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Nodaway County population
46.7 mi, 
192°
• Page County
30.5 mi, 
230°
• Madison County
41.4 mi, 
58°
• Cass County
24.8 mi, 
330°
• Union County
23.6 mi, 
88°
• Montgomery County
24 mi, 
270°
• Adair County
24.1 mi, 
28°
• Taylor County
19.6 mi, 
180°
• Ringgold County
30.8 mi, 
129°
• Worth County
40.1 mi, 
158°
[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
*Pottawattamie Iowa Notes
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