Prince William County           

GEOGRAPHY	​Total Area (land & water): 348.5 sq. miles Official County Basemap County Boundaries & Water Features: Eastern border: Potomac River, NE border: Occoquan River/Reservoir & Occoquan Bay, N-NW border: Bull Run, SE border: Chopawamsic Creek ​Major Parks and Natural Lands: Manassas National Battlefield Park (Northwestern PWC), Prince William Forest Park (Southeastern PWC), Occoquan Bay National Wildlife Refuge (Eastern PWC), Locust Shade Park (Southeastern PWC), Ben Lomond Regional Park (Northwestern PWC), Dove's Landing (mid-county), Silver Lake Regional Park (Western PWC), James S. Long Regional Park (Western PWC), Andrew Leitch Park (Eastern PWC). Bordering Counties and Cities​ Clockwise from the North: Fairfax County (N,NE), Manassas Park City (N), Manassas City (Central), Charles County, MD (E), Stafford County (S), Fauquier County (W-SW), Loudoun County (N-NW)​ ​ ​Combined Statistical Area (CSA): Washington-Baltimore-Arlington, DC-MD-VA-WV-PA (548) Metropolitan Statistical Area (MSA)​: Washington-Arlington-Alexandria, DC-VA-MD-WV MSA (47900) Metropolitan Division: Washington-Arlington-Alexandria, DC-VA-MD-WV (47894) U.S. Census Statistical Area Delineation Files
POPULATION	​Prince William County ​D.C. Metro1 ​Virginia United States ​ Value​ ​% Value​ ​% Value​ ​% Value​ ​% ​Total Population2 465,346 -- 6,216,589   8,470,020   325,719,178   Population Density (ppl per sq. mi.) 1,383.3 --​ 1,110.4   214.5   92.2   ​Male 232,117 49.9% 3,037,103 48.9% 4,165,164 49.2% 160,339,663 49.2% Female​ 233,229 50.1% 3,179,486 51.1% 4,304,856 50.8% 165,379,515 50.8% ​Median Age 34.4 -- 36.5   37.8   37.7   Under 18​ 128,912 27.7% 1,440,600 23.2% 1,889,489 22.3% 74,682,302 22.9% 65 and Over​ 40,712 8.7% 738,295 11.9% 1,202,643 14.2% 48,433,461 14.9% White (non-Hispanic)​ 207,619 44.6% 2,877,213 46.3% 5,304,137 62.6% 200,175,318 61.5% Black (non-Hispanic)​ 94,109 20.2% 1,546,347 24.9% 1,595,687 18.8% 40,024,853 12.3% Asian (non-Hispanic)​ 37,404 8.0% 613,893 9.9% 522,500 6.2% 17,239,075 5.3% Some other race (non-Hispanic)​ 1,401 0.3% 21,394 0.3% 20,838 0.2% 725,940 0.2% ​Two or more races (non-Hispanic) 18,858 4.1% 193,126 3.1% 245,660 2.9% 7,560,736 2.3% Other​ 1,644 0.4% 15,151 0.2% 22,417 0.3% 2,652,682 0.8% ​Hispanic or Latino (of any race) 104,311 22.4% 949,465 15.3% 758,781 9.0% 57,340,573 17.6% ​Foreign Born 108,894 23.4% 1,405,938 22.6% 1,027,592 12.1% 43,660,105 13.4% Speak English less than "very well" 54,649 11.7% 606,246 9.8% 460,669 5.4% 26,031,222 8.0%
HOUSEHOLDS ​	​Prince William County ​D.C. Metro1 ​Virginia United States   Value​ ​% Value​ ​% Value​ ​% Value​ ​% Households4 147,584   2,203,717   3,120,880   120,062,818   Owner-Occupied 106,947 72.5% 1,398,053 63.4% 2,065,160 66.2% 76,622,506 63.8% ​Renter-Occupied 40,637 27.5% 805,664 36.6% 1,055,720 33.8% 43,440,312 36.2% Families​ 114,247 77.4% 1,456,329 66.1% 2,088,281 66.9% 79,113,739 65.9% Avg. Household Size​ 3.06   2.76   2.62   2.63   ​Avg. Family Size 3.65   3.37   3.17   3.24   ​Married-Couple Households 89,658 60.8% 1,090,161 49.5% 1,578,411 50.6% 58,057,465 48.4% Married Household with Own Children under 18 Years 47,863 32.4% 502,740 22.8% 639,535 20.5% 22,868,237 19.0% Householder with no Spouse Present, with Own Children under 18 Years 13,383 9.1% 179,888 8.2% 265,769 8.5% 11,048,653 9.2%
​​ HOUSING	​Prince William County ​D.C. Metro1 ​Virginia United States   Value​ ​% Value​ ​% Value​ ​% Value​ ​% Housing Units4 154,812   2,354,827   3,512,917   137,407,308   ​Median Year Structures Built 1991   1980   1981   1977   1 Unit, Detached 84,530 54.6% 1,107,759 47.0% 2,350,784 66.9% 93,426,209 68.0% 1 Unit, Attached 38,463 24.8% 464,555 19.7% 388,817 11.1% 8,020,590 5.8% 2 or More Units 31,867 20.6% 781,865 33.2% 772,125 22.0% 35,843,833 26.1% Median Value $358,300   $397,900   $255,800   $193,500   Median Number of Rooms 7.1   6.1   6   5.5   Note: percentages for unit types may not add up to 100% due to rounding and the data excludes units such as boats, RVs, and vans.
ECONOMIC5	​Prince William County ​D.C. Metro1 ​Virginia United States   Value​ ​% Value​ ​% Value​ ​% Value​ ​% In Labor Force 256,834   3,418,755   4,348,731   75,978,000   Unemployment Rate   3.6%   3.4%   3.0%   3.8% At-Place Employment 129,442   3,133,386   3,871,561   145,156,467   Establishments of Employment 9,375   194,117   276,135   10,000,779   ​Median Household Income $101,059   $97,148   $68,766   $57,652   ​Individuals with Income Below Poverty Level 31,939 7.0% 507,133 8.3% 920,314 11.2% 46,376,386 14.6%

Notes:

*These population estimates are from the Census Bureau's Population Estimates Program's (PEP) Annual Estimates of the Resident Population as of July 1, 2017.

1. "D.C. Metro" = Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area (MSA), which includes numerous counties and independent cities in the region surrounding the District of Columbia.

2. The values in these tables were derived using a reverse calculation from percentages taken from the U.S. Census 2013-2017 American Community Survey (ACS) 5-Year Estimates. These percentages are then applied to the most up-to-date population and housing estimates from the Census Population Estimates Program (PEP) to yield the each value. For Prince William, these estimates are from the GIS Division.

3. Total population for Prince William County comes from the county's standard data dictionary (as of Quarter 4, 2018). The population estimates for the D.C. Metro and Virginia were obtained from the Census Bureau's Annual Estimates of the Resident Population as of July 1, 2017.

4. Total households and housing units for Prince William County come from the county's standard data dictionary (as of Quarter 4, 2018). Households and housing unit estimates for Virginia and the D.C. Metro were obtained from the U.S. Census 2017 American Community Survey (ACS) 1-Year Estimates.

5. The labor force value comes from a labor force participation rate of 75.3% from the Census ACS 2013-2017. The unemployment rate is also from the Census Bureau. At-place employment and establishments are for the year 2018 or averages of the latest quarters available in 2018. Sources: Bureau of Labor Statistics (BLS): Local Area Unemployment Statistics (LAUS) & Quarterly Census of Employment and Wages (QCEW). 

See Prince William County's Standard Data Dictionary for the county's official, detailed demographic database.