Last official estimated population of Prince William County was 406,370 (year 2014)[1]. This was 0.127% of total US population and 4.8% of total Virginia state population. Area of Prince William County is 348.5 mi² (=902.5 km²), in this year population density was 1,166.14 p/mi². If population growth rate would be same as in period 2010-2014 (+0.27%/yr), Prince William County population in 2026 would be 419,761 [0].
Historical population of Prince William 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] +0.92 %/yr
[1800-1810] -1.18 %/yr
[1810-1820] -1.81 %/yr
[1820-1830] -0.09 %/yr
[1830-1840] -1.35 %/yr
[1840-1850] -0.02 %/yr
[1850-1860] +0.52 %/yr
[1860-1870] -1.31 %/yr
[1870-1880] +2.04 %/yr
[1880-1890] +0.66 %/yr
[1890-1900] +1.26 %/yr
[1900-1910] +0.79 %/yr
[1910-1920] +1.28 %/yr
[1920-1930] +0.21 %/yr
[1930-1940] +2.43 %/yr
[1940-1950] +2.46 %/yr
[1950-1960] +8.29 %/yr
[1960-1970] +8.28 %/yr
[1970-1980] +2.68 %/yr
[1980-1990] +4.04 %/yr
[1990-2000] +2.73 %/yr
[2000-2005] +4.5 %/yr
[2005-2010] +2.77 %/yr
[2010-2014] +0.27 %/yr
Looking for settlements in Prince William County? Visit this page: Settlements in Prince William County, VA
Population of Prince William County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 18069 | 17351 | 35,420 |
| 5 to 9 | 18218 | 17209 | 35,427 |
| 10 to 14 | 17618 | 17029 | 34,647 |
| 15 to 19 | 15612 | 14754 | 30,366 |
| 20 to 24 | 15061 | 13952 | 29,013 |
| 25 to 29 | 14965 | 14687 | 29,652 |
| 30 to 34 | 17365 | 17618 | 34,983 |
| 35 to 39 | 16678 | 17302 | 33,980 |
| 40 to 44 | 17092 | 17468 | 34,560 |
| 45 to 49 | 16696 | 16854 | 33,550 |
| 50 to 54 | 16037 | 16087 | 32,124 |
| 55 to 59 | 13047 | 13255 | 26,302 |
| 60 to 64 | 9217 | 9897 | 19,114 |
| 65 to 69 | 7050 | 7905 | 14,955 |
| 70 to 74 | 4329 | 5203 | 9,532 |
| 75 to 79 | 2521 | 3240 | 5,761 |
| 80 to 84 | 1393 | 2089 | 3,482 |
| 85+ | 1072 | 2154 | 3,226 |
Prince William 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 | 171454 | 176510 | 347,964 |
| WAC | 153865 | 150575 | 304,440 |
| WA | 145376 | 141690 | 287,066 |
| NHWAC | 109236 | 109060 | 218,296 |
| NHWA | 102228 | 101699 | 203,927 |
| BAC | 51120 | 54986 | 106,106 |
| H | 50586 | 47544 | 98,130 |
| NHBAC | 47161 | 50649 | 97,810 |
| BA | 46273 | 49696 | 95,969 |
| NHBA | 43215 | 46318 | 89,533 |
| HWAC | 44629 | 41515 | 86,144 |
| HWA | 43148 | 39991 | 83,139 |
| AAC | 21880 | 23983 | 45,863 |
| NHAAC | 20966 | 23076 | 44,042 |
| AA | 17824 | 19834 | 37,658 |
| NHAA | 17350 | 19369 | 36,719 |
| TOM | 9498 | 10041 | 19,539 |
| NHTOM | 7851 | 8325 | 16,176 |
| IAC | 4762 | 4729 | 9,491 |
| HBAC | 3959 | 4337 | 8,296 |
| HBA | 3058 | 3378 | 6,436 |
| HIAC | 2744 | 2549 | 5,293 |
| IA | 2582 | 2354 | 4,936 |
| NHIAC | 2018 | 2180 | 4,198 |
| HIA | 2054 | 1842 | 3,896 |
| HTOM | 1647 | 1716 | 3,363 |
| NAC | 927 | 909 | 1,836 |
| HAAC | 914 | 907 | 1,821 |
| NHNAC | 625 | 647 | 1,272 |
| NHIA | 528 | 512 | 1,040 |
| HAA | 474 | 465 | 939 |
| NA | 487 | 439 | 926 |
| NHNA | 282 | 287 | 569 |
| HNAC | 302 | 262 | 564 |
| HNA | 205 | 152 | 357 |
• Fairfax County population
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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
See note C22 Virginia Notes
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