NYC Open Data : Clearinghouse for data from all New York City agencies. Much of this data in this collection is already in GIS friendly formats.
BYTES of the Big Apple : Portal for the geographic datasets provided by the NYC Planning Department. Includes tax lots (Mappluto), various boundaries and facilities, and official street centerline (LION) files.
- LION - Direct download of street centerline files from 2015 with street and borough code address geolocators included
CoreData.nyc : Map based data hub for housing and neighborhood resources from NYU Furman Center for Real Estate and Urban Policy.
NYPL Map Division
- Digital Gallery : Digital collections include a wide-array of scanned maps.
GeoData@Columbia : A wide variety of NYC specific datasets and maps can be found in our own collections.