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Philadelphia maps and geographic information includes print maps in the Penn Libraries collection, digitized maps, interactive web map applications, or GIS data in various formats such as shapefile or TIFF.
Some resources are limited to Philadelphia, while others have national coverage including neighborhood-level detail (e.g. ZIP code or census tract).
PASDA is the official public access geospatial information clearinghouse for the state of Pennsylvania, providing free shapefiles, KMLs, and WMS from a wide variety of agencies around Pennsylvania. Catalog contains data from the City of Philadelphia, the Delaware Valley Regional Planning Commission, and the USGS, among others.
Search engine for freely accessible data about Philadelphia, including geographic data and map applications. It repeats many of the resources in PASDA, but includes some map applications that don't appear there.