Last official estimated population of Washington County was 207,891 (year 2014)[1]. This was 0.065% of total US population and 1.6% of total Pennsylvania state population. Area of Washington County is 860.9 mi² (=2229.7 km²), in this year population density was 241.48 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Washington County population in 2025 would be 208,086 [0].
Historical population of Washington County for period 1790-2014 [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
[1790-1800] +1.72 %/yr
[1800-1810] +2.52 %/yr
[1810-1820] +0.99 %/yr
[1820-1830] +0.67 %/yr
[1830-1840] -0.36 %/yr
[1840-1850] +0.85 %/yr
[1850-1860] +0.41 %/yr
[1860-1870] +0.35 %/yr
[1870-1880] +1.35 %/yr
[1880-1890] +2.53 %/yr
[1890-1900] +2.62 %/yr
[1900-1910] +4.54 %/yr
[1910-1920] +2.78 %/yr
[1920-1930] +0.81 %/yr
[1930-1940] +0.29 %/yr
[1940-1950] -0.06 %/yr
[1950-1960] +0.36 %/yr
[1960-1970] -0.3 %/yr
[1970-1980] +0.29 %/yr
[1980-1990] -0.59 %/yr
[1990-2000] -0.08 %/yr
[2000-2005] +0.23 %/yr
[2005-2010] +0.24 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, PA
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 5282 | 5116 | 10,398 |
| 5 to 9 | 5745 | 5433 | 11,178 |
| 10 to 14 | 6209 | 5817 | 12,026 |
| 15 to 19 | 6670 | 6380 | 13,050 |
| 20 to 24 | 6469 | 6286 | 12,755 |
| 25 to 29 | 5797 | 5307 | 11,104 |
| 30 to 34 | 5636 | 5608 | 11,244 |
| 35 to 39 | 5766 | 5759 | 11,525 |
| 40 to 44 | 6454 | 6422 | 12,876 |
| 45 to 49 | 7067 | 7319 | 14,386 |
| 50 to 54 | 7960 | 8220 | 16,180 |
| 55 to 59 | 8379 | 8664 | 17,043 |
| 60 to 64 | 7302 | 7717 | 15,019 |
| 65 to 69 | 6018 | 6382 | 12,400 |
| 70 to 74 | 4112 | 4854 | 8,966 |
| 75 to 79 | 3006 | 3892 | 6,898 |
| 80 to 84 | 1978 | 3073 | 5,051 |
| 85+ | 2043 | 4045 | 6,088 |
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 | 100252 | 104840 | 205,092 |
| WAC | 97273 | 101790 | 199,063 |
| NHWAC | 95812 | 100477 | 196,289 |
| WA | 95585 | 100159 | 195,744 |
| NHWA | 94239 | 98955 | 193,194 |
| BAC | 4687 | 4378 | 9,065 |
| NHBAC | 4487 | 4217 | 8,704 |
| BA | 3521 | 3229 | 6,750 |
| NHBA | 3414 | 3150 | 6,564 |
| TOM | 1764 | 1714 | 3,478 |
| NHTOM | 1639 | 1598 | 3,237 |
| H | 1641 | 1454 | 3,095 |
| HWAC | 1461 | 1313 | 2,774 |
| HWA | 1346 | 1204 | 2,550 |
| AAC | 1140 | 1284 | 2,424 |
| NHAAC | 1107 | 1260 | 2,367 |
| AA | 841 | 998 | 1,839 |
| NHAA | 823 | 984 | 1,807 |
| IAC | 545 | 567 | 1,112 |
| NHIAC | 476 | 499 | 975 |
| HBAC | 200 | 161 | 361 |
| IA | 147 | 158 | 305 |
| HTOM | 125 | 116 | 241 |
| NHIA | 106 | 120 | 226 |
| HBA | 107 | 79 | 186 |
| NAC | 81 | 73 | 154 |
| NHNAC | 73 | 65 | 138 |
| HIAC | 69 | 68 | 137 |
| HIA | 41 | 38 | 79 |
| NA | 35 | 36 | 71 |
| NHNA | 31 | 33 | 64 |
| HAAC | 33 | 24 | 57 |
| HAA | 18 | 14 | 32 |
| HNAC | 8 | 8 | 16 |
| HNA | 4 | 3 | 7 |
• Allegheny County population
23.5 mi, 
37°
• Beaver County
33.8 mi, 
351°
• Fayette County
37.7 mi, 
120°
• Belmont County
39.9 mi, 
251°
• Jefferson County
30.3 mi, 
297°
• Ohio County
20.7 mi, 250°
• Greene County
24.4 mi, 
176°
• Marshall County
32.6 mi, 
222°
• Hancock County
27.6 mi, 
322°
• Brooke County
17.9 mi, 
286°
[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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