Last official estimated population of Washington County was 10,190 (year 2014)[1]. This was 0.003% of total US population and 0.6% of total Idaho state population. Area of Washington County is 1,473.5 mi² (=3816.3 km²), in this year population density was 6.92 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Washington County population in 2024 would be 10,170 [0].
Historical population of Washington County for period 1880-2014 [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
[1880-1890] +15.87 %/yr
[1890-1900] +6.02 %/yr
[1900-1910] +4.9 %/yr
[1910-1920] -1.62 %/yr
[1920-1930] -1.67 %/yr
[1930-1940] +1.07 %/yr
[1940-1950] -0.32 %/yr
[1950-1960] -0.23 %/yr
[1960-1970] -0.93 %/yr
[1970-1980] +1.44 %/yr
[1980-1990] -0.29 %/yr
[1990-2000] +1.56 %/yr
[2000-2005] +0.02 %/yr
[2005-2010] +0.4 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, ID
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 288 | 216 | 504 |
| 5 to 9 | 310 | 326 | 636 |
| 10 to 14 | 358 | 371 | 729 |
| 15 to 19 | 375 | 351 | 726 |
| 20 to 24 | 278 | 239 | 517 |
| 25 to 29 | 210 | 196 | 406 |
| 30 to 34 | 221 | 237 | 458 |
| 35 to 39 | 257 | 253 | 510 |
| 40 to 44 | 286 | 274 | 560 |
| 45 to 49 | 274 | 288 | 562 |
| 50 to 54 | 341 | 348 | 689 |
| 55 to 59 | 331 | 381 | 712 |
| 60 to 64 | 365 | 373 | 738 |
| 65 to 69 | 356 | 363 | 719 |
| 70 to 74 | 296 | 284 | 580 |
| 75 to 79 | 223 | 193 | 416 |
| 80 to 84 | 128 | 163 | 291 |
| 85+ | 100 | 168 | 268 |
Washington 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 | 4837 | 4866 | 9,703 |
| WA | 4743 | 4768 | 9,511 |
| NH | 4080 | 4215 | 8,295 |
| NHWAC | 3973 | 4115 | 8,088 |
| NHWA | 3898 | 4034 | 7,932 |
| H | 917 | 809 | 1,726 |
| HWAC | 864 | 751 | 1,615 |
| HWA | 845 | 734 | 1,579 |
| IAC | 137 | 138 | 275 |
| TOM | 100 | 101 | 201 |
| NHIAC | 96 | 100 | 196 |
| NHTOM | 80 | 84 | 164 |
| IA | 73 | 75 | 148 |
| AAC | 61 | 70 | 131 |
| NHAAC | 50 | 58 | 108 |
| AA | 46 | 53 | 99 |
| NHIA | 43 | 48 | 91 |
| BAC | 53 | 33 | 86 |
| NHAA | 40 | 42 | 82 |
| HIAC | 41 | 38 | 79 |
| HIA | 30 | 27 | 57 |
| NHBAC | 37 | 19 | 56 |
| BA | 28 | 15 | 43 |
| HTOM | 20 | 17 | 37 |
| HBAC | 16 | 14 | 30 |
| NAC | 10 | 18 | 28 |
| NHBA | 17 | 6 | 23 |
| HAAC | 11 | 12 | 23 |
| HBA | 11 | 9 | 20 |
| NA | 7 | 12 | 19 |
| HAA | 6 | 11 | 17 |
| HNAC | 5 | 11 | 16 |
| HNA | 5 | 11 | 16 |
| NHNAC | 5 | 7 | 12 |
| NHNA | 2 | 1 | 3 |
• Ada County population
74.2 mi, 
158°
• Canyon County
57.2 mi, 
175°
• Union County
83.4 mi, 
315°
• Payette County
30.9 mi, 175°
• Gem County
33.2 mi, 
143°
• Baker County
47.4 mi, 
291°
• Valley County
61.3 mi, 
68°
• Wallowa County
81.4 mi, 
346°
• Boise County
62.4 mi, 
120°
• Adams County
33.9 mi, 
29°
[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
*Ada, Idaho; Boise Idaho Notes
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