Last official estimated population of Adams County was 18,760 (year 2014)[1]. This was 0.006% of total US population and 0.3% of total Washington state population. Area of Adams County is 1,929.9 mi² (=4998.3 km²), in this year population density was 9.72 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Adams County population in 2024 would be 18,840 [0].
Historical population of Adams County for period 1890-2014 [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
[1890-1900] +8.72 %/yr
[1900-1910] +8.48 %/yr
[1910-1920] -1.26 %/yr
[1920-1930] -2.18 %/yr
[1930-1940] -2.15 %/yr
[1940-1950] +0.59 %/yr
[1950-1960] +4.19 %/yr
[1960-1970] +1.92 %/yr
[1970-1980] +1 %/yr
[1980-1990] +0.25 %/yr
[1990-2000] +1.9 %/yr
[2000-2005] +0.59 %/yr
[2005-2010] +2.05 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Adams County? Visit this page: Settlements in Adams County, WA
Population of Adams County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1037 | 994 | 2,031 |
| 5 to 9 | 1070 | 930 | 2,000 |
| 10 to 14 | 856 | 862 | 1,718 |
| 15 to 19 | 805 | 774 | 1,579 |
| 20 to 24 | 758 | 676 | 1,434 |
| 25 to 29 | 598 | 554 | 1,152 |
| 30 to 34 | 558 | 582 | 1,140 |
| 35 to 39 | 609 | 589 | 1,198 |
| 40 to 44 | 557 | 513 | 1,070 |
| 45 to 49 | 524 | 486 | 1,010 |
| 50 to 54 | 517 | 498 | 1,015 |
| 55 to 59 | 488 | 505 | 993 |
| 60 to 64 | 444 | 433 | 877 |
| 65 to 69 | 322 | 325 | 647 |
| 70 to 74 | 242 | 220 | 462 |
| 75 to 79 | 160 | 182 | 342 |
| 80 to 84 | 98 | 131 | 229 |
| 85+ | 114 | 168 | 282 |
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 | 8994 | 8631 | 17,625 |
| WA | 8850 | 8522 | 17,372 |
| H | 6138 | 5745 | 11,883 |
| HWAC | 5519 | 5146 | 10,665 |
| HWA | 5457 | 5089 | 10,546 |
| NH | 3619 | 3677 | 7,296 |
| NHWAC | 3475 | 3485 | 6,960 |
| NHWA | 3393 | 3433 | 6,826 |
| IAC | 540 | 538 | 1,078 |
| IA | 473 | 486 | 959 |
| HIAC | 467 | 480 | 947 |
| HIA | 432 | 449 | 881 |
| BAC | 207 | 154 | 361 |
| AAC | 152 | 209 | 361 |
| TOM | 156 | 127 | 283 |
| AA | 109 | 174 | 283 |
| BA | 159 | 109 | 268 |
| HBAC | 139 | 101 | 240 |
| NHAAC | 80 | 131 | 211 |
| HBA | 121 | 80 | 201 |
| NHAA | 51 | 114 | 165 |
| NHTOM | 90 | 62 | 152 |
| HAAC | 72 | 78 | 150 |
| NHIAC | 73 | 58 | 131 |
| HTOM | 66 | 65 | 131 |
| NHBAC | 68 | 53 | 121 |
| HAA | 58 | 60 | 118 |
| NHIA | 41 | 37 | 78 |
| NHBA | 38 | 29 | 67 |
| NAC | 28 | 21 | 49 |
| NHNAC | 14 | 12 | 26 |
| HNAC | 14 | 9 | 23 |
| NA | 10 | 4 | 14 |
| NHNA | 6 | 2 | 8 |
| HNA | 4 | 2 | 6 |
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61.3 mi, 
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[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
*Whitman Washington Notes
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