Last official estimated population of Washington County was 147,749 (year 2014)[1]. This was 0.046% of total US population and 2.5% of total Maryland state population. Area of Washington County is 467.3 mi² (=1210.4 km²), in this year population density was 316.15 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Washington County population in 2024 would be 148,550 [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] +1.66 %/yr
[1800-1810] +0.04 %/yr
[1810-1820] +2.11 %/yr
[1820-1830] +0.91 %/yr
[1830-1840] +1.33 %/yr
[1840-1850] +0.67 %/yr
[1850-1860] +0.18 %/yr
[1860-1870] +1 %/yr
[1870-1880] +1.06 %/yr
[1880-1890] +0.31 %/yr
[1890-1900] +1.27 %/yr
[1900-1910] +0.95 %/yr
[1910-1920] +1.87 %/yr
[1920-1930] +0.99 %/yr
[1930-1940] +0.44 %/yr
[1940-1950] +1.37 %/yr
[1950-1960] +1.46 %/yr
[1960-1970] +1.3 %/yr
[1970-1980] +0.86 %/yr
[1980-1990] +0.71 %/yr
[1990-2000] +0.83 %/yr
[2000-2005] +1.5 %/yr
[2005-2010] +0.74 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, MD
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4516 | 4177 | 8,693 |
| 5 to 9 | 4617 | 4525 | 9,142 |
| 10 to 14 | 4909 | 4640 | 9,549 |
| 15 to 19 | 4811 | 4280 | 9,091 |
| 20 to 24 | 5192 | 4197 | 9,389 |
| 25 to 29 | 5402 | 4559 | 9,961 |
| 30 to 34 | 5094 | 4254 | 9,348 |
| 35 to 39 | 4803 | 4152 | 8,955 |
| 40 to 44 | 5497 | 4825 | 10,322 |
| 45 to 49 | 5740 | 5196 | 10,936 |
| 50 to 54 | 5778 | 5657 | 11,435 |
| 55 to 59 | 5293 | 5080 | 10,373 |
| 60 to 64 | 4308 | 4500 | 8,808 |
| 65 to 69 | 3516 | 3867 | 7,383 |
| 70 to 74 | 2547 | 3011 | 5,558 |
| 75 to 79 | 1817 | 2332 | 4,149 |
| 80 to 84 | 1260 | 1831 | 3,091 |
| 85+ | 1130 | 2260 | 3,390 |
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 | 72824 | 70375 | 143,199 |
| WAC | 64215 | 65745 | 129,960 |
| WA | 62388 | 63911 | 126,299 |
| NHWAC | 61284 | 63220 | 124,504 |
| NHWA | 59651 | 61568 | 121,219 |
| BAC | 11707 | 7242 | 18,949 |
| NHBAC | 11267 | 6797 | 18,064 |
| BA | 10380 | 5868 | 16,248 |
| NHBA | 10072 | 5554 | 15,626 |
| H | 3406 | 2968 | 6,374 |
| HWAC | 2931 | 2525 | 5,456 |
| HWA | 2737 | 2343 | 5,080 |
| TOM | 1948 | 1962 | 3,910 |
| NHTOM | 1742 | 1768 | 3,510 |
| AAC | 1573 | 1685 | 3,258 |
| NHAAC | 1515 | 1639 | 3,154 |
| AA | 1214 | 1326 | 2,540 |
| NHAA | 1174 | 1298 | 2,472 |
| IAC | 622 | 596 | 1,218 |
| NHIAC | 451 | 455 | 906 |
| HBAC | 440 | 445 | 885 |
| HBA | 308 | 314 | 622 |
| IA | 251 | 221 | 472 |
| HTOM | 206 | 194 | 400 |
| HIAC | 171 | 141 | 312 |
| NHIA | 146 | 142 | 288 |
| NAC | 122 | 120 | 242 |
| NHNAC | 104 | 105 | 209 |
| HIA | 105 | 79 | 184 |
| HAAC | 58 | 46 | 104 |
| NA | 49 | 55 | 104 |
| NHNA | 39 | 45 | 84 |
| HAA | 40 | 28 | 68 |
| HNAC | 18 | 15 | 33 |
| HNA | 10 | 10 | 20 |
• Frederick County population
24.1 mi, 
112°
• Franklin County
22.8 mi, 
12°
• Berkeley County
16 mi, 
227°
• Adams County
36.6 mi, 
59°
• Frederick County
36.6 mi, 
220°
• Jefferson County
20.6 mi, 
187°
• Winchester city
35.4 mi, 
213°
• Morgan County
23.8 mi, 
261°
• Fulton County
26.8 mi, 
322°
• Clarke County
35 mi, 
195°
[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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