In the past, most demographic information was gathered every ten years by the US Census. However, there are now many government agencies and private organizations who generate and distribute data on population, housing, and economic conditions. The most commonly used demographic information sources are:

The United States Census

The US Census is the main source of Chester County population and housing data. The link below allows you to easily access the US Census online data sets for Chester County and its 73 municipalities. The webpage hosting the US Census search engine, which provides access to the full census database, can be viewed here.

Since 1790, the US Census has collected/compiled "decennial" census data once every ten years. However, starting in 2008, the US Census also began collecting data on an ongoing basis including 1-year estimates and 5-year estimates using the American Community Survey (ACS). The Census also generates "Monthly Population Estimates," based on the 2010 decennial census. Learn More

Pennsylvania State Data

Specialized data focusing on the population and economy of Pennsylvania is published by Penn State University's Pennsylvania State Data Center, and other statewide organizations. Learn More

Delaware Valley Regional Planning Commission (DVRPC) Data

Specialized data focusing on the population, housing, and economy of the Philadelphia region (including Chester County) is published by DVRPC. Learn More

The Need for Consistency of Data

The wide array of data now available can sometimes be confusing. For consistency, the Planning Commission determines the county-wide current population based on the annually reported ACS 1-Year estimates as generated by the US Census. Current population for each municipality is gathered by the ACS 5-Year estimates as generated by the US Census. All county and municipal population projections are based on forecasts by the Delaware Valley Regional Planning Commission (DVRPC).