Last official estimated population of Washington County was 238,897 (year 2014)[1]. This was 0.075% of total US population and 4.4% of total Minnesota state population. Area of Washington County is 422.8 mi² (=1095.1 km²), in this year population density was 565.03 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), Washington County population in 2026 would be 241,195 [0].
Historical population of Washington County for period 1850-2014 [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

[1850-1860] +19.21 %/yr
[1860-1870] +6.79 %/yr
[1870-1880] +5.18 %/yr
[1880-1890] +2.88 %/yr
[1890-1900] +0.68 %/yr
[1900-1910] -0.67 %/yr
[1910-1920] -0.9 %/yr
[1920-1930] +0.41 %/yr
[1930-1940] +0.66 %/yr
[1940-1950] +2.71 %/yr
[1950-1960] +4.26 %/yr
[1960-1970] +4.69 %/yr
[1970-1980] +3.19 %/yr
[1980-1990] +2.53 %/yr
[1990-2000] +3.27 %/yr
[2000-2005] +1.8 %/yr
[2005-2010] +1.6 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, MN
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 7732 | 7528 | 15,260 |
| 5 to 9 | 8794 | 8545 | 17,339 |
| 10 to 14 | 9457 | 9170 | 18,627 |
| 15 to 19 | 8856 | 8568 | 17,424 |
| 20 to 24 | 7403 | 6604 | 14,007 |
| 25 to 29 | 6967 | 6721 | 13,688 |
| 30 to 34 | 7999 | 8046 | 16,045 |
| 35 to 39 | 7675 | 7856 | 15,531 |
| 40 to 44 | 8358 | 8441 | 16,799 |
| 45 to 49 | 9083 | 9741 | 18,824 |
| 50 to 54 | 10125 | 10396 | 20,521 |
| 55 to 59 | 9089 | 9387 | 18,476 |
| 60 to 64 | 7244 | 7570 | 14,814 |
| 65 to 69 | 5576 | 5873 | 11,449 |
| 70 to 74 | 3634 | 4018 | 7,652 |
| 75 to 79 | 2388 | 2856 | 5,244 |
| 80 to 84 | 1568 | 2077 | 3,645 |
| 85+ | 1369 | 2569 | 3,938 |
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 |
| NH | 118433 | 121266 | 239,699 |
| WAC | 109801 | 113146 | 222,947 |
| WA | 107365 | 110601 | 217,966 |
| NHWAC | 105326 | 108863 | 214,189 |
| NHWA | 103103 | 106526 | 209,629 |
| AAC | 7577 | 8136 | 15,713 |
| NHAAC | 7472 | 8026 | 15,498 |
| AA | 6654 | 7173 | 13,827 |
| NHAA | 6595 | 7111 | 13,706 |
| BAC | 7117 | 6154 | 13,271 |
| NHBAC | 6839 | 5857 | 12,696 |
| BA | 5907 | 4883 | 10,790 |
| NHBA | 5735 | 4690 | 10,425 |
| H | 4884 | 4700 | 9,584 |
| HWAC | 4475 | 4283 | 8,758 |
| HWA | 4262 | 4075 | 8,337 |
| TOM | 2571 | 2713 | 5,284 |
| NHTOM | 2339 | 2481 | 4,820 |
| IAC | 1407 | 1280 | 2,687 |
| NHIAC | 1163 | 1040 | 2,203 |
| IA | 745 | 541 | 1,286 |
| NHIA | 602 | 413 | 1,015 |
| HBAC | 278 | 297 | 575 |
| HIAC | 244 | 240 | 484 |
| HTOM | 232 | 232 | 464 |
| HBA | 172 | 193 | 365 |
| NAC | 179 | 156 | 335 |
| NHNAC | 148 | 132 | 280 |
| HIA | 143 | 128 | 271 |
| HAAC | 105 | 110 | 215 |
| NA | 75 | 55 | 130 |
| HAA | 59 | 62 | 121 |
| NHNA | 59 | 45 | 104 |
| HNAC | 31 | 24 | 55 |
| HNA | 16 | 10 | 26 |
• Hennepin County population
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41.3 mi,
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21.6 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
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