Philadelphia neighborhoodBase
From the Home Page:
The maps and data displayed on this site have been prepared for the inventory of real property found within the neighborhoods of Philadelphia. Users of this site are hereby notified that the aforementioned public primary information sources should be consulted for verification of the information contained on the maps and in the databases presented on this web site. Neither the University of Pennsylvania, the City of Philadelphia, the Cartographic Modeling Laboratory, nor their collaborators assume any legal responsibility for the information displayed on maps or associated tabular data presented on this web site.