Last official estimated population of Washington County was 131,897 (year 2014)[1]. This was 0.041% of total US population and 2.3% of total Wisconsin state population. Area of Washington County is 435.7 mi² (=1128.3 km²), in this year population density was 302.76 p/mi². If population growth rate would be same as in period 2010-2014 (+0%/yr), Washington County population in 2026 would be 131,927 [0].
Historical population of Washington County for period 1840-2014 [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

[1840-1850] +49.78 %/yr
[1850-1860] +1.94 %/yr
[1860-1870] +0.13 %/yr
[1870-1880] -0.2 %/yr
[1880-1890] -0.3 %/yr
[1890-1900] +0.36 %/yr
[1900-1910] +0.08 %/yr
[1910-1920] +0.78 %/yr
[1920-1930] +0.32 %/yr
[1930-1940] +0.69 %/yr
[1940-1950] +1.78 %/yr
[1950-1960] +3.13 %/yr
[1960-1970] +3.3 %/yr
[1970-1980] +2.89 %/yr
[1980-1990] +1.17 %/yr
[1990-2000] +2.12 %/yr
[2000-2005] +1.37 %/yr
[2005-2010] +0.95 %/yr
[2010-2014] +0 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, WI
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3486 | 3587 | 7,073 |
| 5 to 9 | 4352 | 4251 | 8,603 |
| 10 to 14 | 4735 | 4551 | 9,286 |
| 15 to 19 | 4392 | 4134 | 8,526 |
| 20 to 24 | 3542 | 3232 | 6,774 |
| 25 to 29 | 3351 | 3106 | 6,457 |
| 30 to 34 | 3905 | 3883 | 7,788 |
| 35 to 39 | 4048 | 3883 | 7,931 |
| 40 to 44 | 4399 | 4301 | 8,700 |
| 45 to 49 | 5219 | 5230 | 10,449 |
| 50 to 54 | 5884 | 5795 | 11,679 |
| 55 to 59 | 5230 | 5122 | 10,352 |
| 60 to 64 | 4292 | 4419 | 8,711 |
| 65 to 69 | 3329 | 3462 | 6,791 |
| 70 to 74 | 2255 | 2642 | 4,897 |
| 75 to 79 | 1610 | 1935 | 3,545 |
| 80 to 84 | 1152 | 1531 | 2,683 |
| 85+ | 1028 | 1978 | 3,006 |
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 | 64397 | 65151 | 129,548 |
| NH | 64131 | 65099 | 129,230 |
| WA | 63620 | 64475 | 128,095 |
| NHWAC | 62470 | 63332 | 125,802 |
| NHWA | 61785 | 62713 | 124,498 |
| H | 2078 | 1943 | 4,021 |
| HWAC | 1927 | 1819 | 3,746 |
| HWA | 1835 | 1762 | 3,597 |
| BAC | 1166 | 1023 | 2,189 |
| AAC | 957 | 1104 | 2,061 |
| NHBAC | 1069 | 958 | 2,027 |
| NHAAC | 927 | 1072 | 1,999 |
| AA | 716 | 885 | 1,601 |
| NHAA | 705 | 865 | 1,570 |
| TOM | 812 | 714 | 1,526 |
| BA | 795 | 699 | 1,494 |
| NHBA | 739 | 659 | 1,398 |
| NHTOM | 714 | 652 | 1,366 |
| IAC | 480 | 448 | 928 |
| NHIAC | 364 | 363 | 727 |
| IA | 238 | 242 | 480 |
| NHIA | 169 | 189 | 358 |
| HIAC | 116 | 85 | 201 |
| HBAC | 97 | 65 | 162 |
| HTOM | 98 | 62 | 160 |
| HIA | 69 | 53 | 122 |
| NAC | 55 | 53 | 108 |
| HBA | 56 | 40 | 96 |
| NHNAC | 42 | 45 | 87 |
| HAAC | 30 | 32 | 62 |
| NA | 28 | 27 | 55 |
| NHNA | 19 | 21 | 40 |
| HAA | 11 | 20 | 31 |
| HNAC | 13 | 8 | 21 |
| HNA | 9 | 6 | 15 |
• Milwaukee County population
45.8 mi,
124°
• Waukesha County
26 mi,
188°
• Sheboygan County
35.1 mi,
45°
• Walworth County
52.3 mi,
197°
• Fond du Lac County
28.3 mi,
332°
• Dodge County
23.8 mi,
275°
• Ozaukee County
37 mi,
93°
• Jefferson County
37.7 mi,
226°
• Calumet County
47.5 mi,
1°
• Green Lake County
45.6 mi,
304°
[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
*Brown Wisconsin Notes
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