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Mapping the boundaries of neighborhoods is difficult. The notion of a neighborhood is a mixture of indivduals' and groups' concepts of socially defined locations. Combined with the cartographic need to define a specific location for a neighborhood boundary, the fluid definitions of neighborhoods create ample opportunity for discussion. There are more than a few resources for neighborhood boundary files for use in GIS software:
Shapefiles available through the Flickr API.
Shapefiles of neighborhood boundaries for the largest US cities licensed under a Creative Commons license.
Neighborhood boundary files from the City of San Francisco. Users must register, for free, to download data.
A project to create an alternative placename gazetteer via the OS Open Space API.