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Quarterly Estimates

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The following data attributes are produced quarterly or monthly by the Prince William County GIS Division and other sources. If you are looking for the county's official demographic dataset, please see the Standard Data Dictionary.

QUARTER 3, 2020 (As of 9/30/2020)


Value​%​Units​CurrencySource​Date PostedNotes​
Total Population:​469,139*
people​9/30/2020
PWC GIS Division10/9/2020
 
Housing Units:
157,706
housing units​
9/30/2020
PWC GIS Division​
10/9/2020

Average Household Size: 3.10

Occupancy Rate: 95.86%

1 Unit, Detached (single-family and mobile homes):​85,746
54.37 %
housing units​​9/30/2020PWC GIS Division​10/9/2020

Average Household Size: 3.38

Occupancy Rate: 97.15%

1 Unit, Attached (townhomes):​40,464
25.66 %
housing units​​9/30/2020PWC GIS Division​10/9/2020
Average Household Size: 3.18

Occupancy Rate: 95.44%

Multi-Unit (includes apartments and condominiums):​31,496
19.97 %
housing units​​
9/30/2020PWC GIS Division​10/9/2020
Average Household Size: 2.27

Occupancy Rate: 91.46 %

Households (housing units that are occupied):​151,003
occupied housing units​​
9/30/2020PWC GIS Division​10/9/2020 
Total School Enrollment:91,836
PWCS students​1/31/2020
PWC Public Schools
2/19/2020
Enrollment in Prince William County Public Schools ​(PWCS)
Pre-Kindergarten through 5th grade:​40,659
44.27 %
PWCS students​​1/31/2020PWC Public Schools2/19/2020Enrollment in Prince William County Public Schools ​​(PWCS)
6th grade through 8th grade:​21,415
23.32 %
PWCS students​​1/31/2020PWC Public Schools2/19/2020Enrollment in Prince William County Public Schools ​​(PWCS)
9th grade through 12th grade:​27,890
30.37 %PWCS students​​1/31/2020PWC Public Schools2/19/2020Enrollment in Prince William County Public Schools ​​(PWCS)
Other school types:​1,872
2.04 %PWCS students​​1/31/2020PWC Public Schools2/19/2020Enrollment in Prince William County Public Schools ​(PWCS)​

 

*Notes about the population estimates:

  • The county's Group Quarters estimate is 4,935 people. This is included in the population estimate.
  • 2010 Census tabulation block data adjusted to the latest American Community Survey 1-Year Estimates are used to recalculate occupancy rates and average household size for quarter 4 of each year. Census PUMS (Public Use Microdata Sample) data are used for PUMAS 51244, 51245, and 51246 from the American Community Survey 1-Year estimates for 2016, 2017, and 2018 to also calculate weighted average occupancy rates and household size by housing unit type. These estimates are combined with the adjusted 2010 tabulation block estimates to produce occupancy and average household size by unit type. Changes to these values directly impact household and population totals.
  • Age-restricted (ages 55+) housing was taken into account for the first time in the 2019 Q4 population estimates. Average household size is different in these communities. In 2019 Q4 there are an estimated 5,692 age-restricted housing units in the county. U.S. Census data from the 2012-2016 American Community Survey 5-Year Estimates informs us that there was a population of 82,640 residents ages 55+ and households with the main householder ages 55+ at 43,821. This translates to about 1.89 persons per household. An occupancy rate of 100% was used for age-restricted units. In all, it is estimated that 10,758 residents live in age-restricted units.
  • Source data contain margins of error. Average household size and occupancy data from the American Community Survey represent a sample of the population. Data made available to the public are estimates and contain (+/- x) where x = the margin of error for each respective demographic variable. Data from the ACS are used in generating quarterly estimates. The following are the overall margins of error for the data used to generate the county's household size and occupancy rates:

Average Household Size
​Margin of Error
​Occupied Housing Units
​Margin of Error
​PUMA 51244
​3.27
​+/- 0.04
​38,805
+/- 417
​PUMA 51245
​3.27
+/- 0.05
​38,520
+/- 435
​PUMA 51246
​3.19
​+/- 0.03
​80,597
​+/- 747
​Prince William County
​3.22
+/- 0.02
​140,473
+/- 767


NOTES:

  • The quarterly estimates and annual estimates from 2010 to 2016 were restated in February of 2017 to reflect the markedly higher estimates generated starting at 2016 Quarter 3 by smoothing over prior estimates. For more information about these changes and corresponding methods, see the following PDF: Redistributing Quarterly Population Estimates, 2010-2016
  • Compare PWC's estimates to the most current estimates and projections of PWC's population:
    • U.S. Census ACS 1-Year Estimate (July 2018): 468,011
    • Weldon Cooper Center (July 1, 2019): 465,498
    • COG 2020 Projection (Round 9.1): 467,900

QUARTERLY ESTIMATE HISTORY *

 
QTRPOPULATIONHOUSING UNITSHOUSEHOLDS
20101398,258--
 2401,031138,667133,824
 3403,804139,268134,386
 4406,577139,868134,947
20111408,515140,288135,340
 2410,454140,708135,733
 3412,392141,127136,125
 4414,330141,547136,518
20121416,218141,956136,900
 2418,107142,365137,283
 3419,995142,774137,665
 4421,883143,18338,048
20131423,782143,594138,432
 2425,681144,005138,817
 3427,580144,417139,202
 4429,479144,828139,586
20141431,550145,276140,006
 2433,621145,725140,425
 3435,692146,173140,845
 4437,762146,622141,264
20151439,694147,040141,656
 2441,627147,459142,047
 3443,559147,877142,438
 4445,491148,296142,830
20161447,678148,769143,273
 2449,864149,243143,716
 3452,051149,716144,159
 4454,238150,190144,602
20171455,182150,789145,071
 2456,126151,389145,540
 3457,071151,988146,009
 4458,015152,588146,479
20181458,990153,092146,914
 2459,966153,595147,348
 3460,941154,099147,783
 4461,917154,603148,217
20191462,892155,106148,652
 2463,867155,610149,086
 3464,843156,113149,521
 4465,818156,617149,955
20201 466,809156,948150,273
 2467,935157,305
150,617
 3469,139157,706151,003
 4   

*Restatments:
  • The quarterly estimates for 2017 were restated in April 2018, and in February 2017 the quarterly estimates were restated back to 2010.
  • The quarterly estimates for 2018 and 2019 were restated in March 2020. This followed new occupany and average household size data in conjunction with lowered average household sizes assigned to units in age-restricted communities applied to 2019 Q4 estimates.

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