Demographic Characteristics 

American Community Survey (Annual Data)

The U.S. Census Bureau's American Community Survey (ACS) provides annual demographic data including educational attainment, foreign born population, language spoken at home, household income, and housing characteristics.

When using the American Community Survey's data, it is best to use percentages rather than report actual numbers because the ACS is a survey of a small subset of the county's population.  

ACS data previous to 2018 can be found at the Census Bureau's American FactFinder. ACS data from 2018 onward can be found here.

Loudoun County Analysis

ACS One-Year Estimates

  • Best to use if current data is needed, but be aware it has large statistical sample error
  • Available countywide
  • Not available for County sub-geographies (e.g. towns, election districts)

ACS Five-Year Estimates

  • Available for County sub-geographies
  • Use for increased statistical reliability

2010 Decennial Census

The U.S. Census Bureau's Decennial Census is conducted every ten years to count 100% of the county's population. Census 2010 data can be found at the Census Bureau's American FactFinder. Simply type in “Loudoun County” in the search box.