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ZIP codes Map (PDF). These are defined by the U.S. Post Office and are subject to change. The Census Bureau maintains its own version called the ZCTA (ZIP Code Tabulation Area).
Census tracts Map (PDF). These small areas are defined by the U.S. Census Bureau to contain about 4,000 residents. They change every 10 years, along with the Decennial Census. Smaller census units are block groups and blocks.
Neighborhoods Though the names of neighborhoods are in common use, they have no precise definition, making it difficult to describe statistically. NeighborhoodBase does calculate statistics by its definitions of Philadelphia neighborhoods.
Planning Analysis Sections 12 large areas defined by the Philadelphia City Planning Commission.
Ward Map (PDF). 66 political units within the city, smaller than city council districts but larger than divisions.
What time period?
Most of the online resources listed in this guide are from the past decade. For earlier statistics, it may be useful to determine which organization or government agency collects the desired data and search for them as an author in Franklin, the library catalog. This will locate printed reports that are not available online.
Librarian & Coordinator of Social Sciences Collections