The Geo API suite includes mqueryultiple APIs that allow users to access millions of geographic data points that have been organized using one consistent, unified schema. Users can query by Latitude/Longitude/Radius, Bounding Box, QuadKey, or any valid return key (Wikipedia Page ID, FourSquare Venue ID). The APIs pull data from at least a dozen sources including Wikipedia, Foursquare, Zillow, American Community Survey and more. It uses RESTful calls and responses are formatted in JSON.
Data marketplace InfoChimps continues its march to API-ify its most useful, sliceable datasets. The latest is a bundle it calls the InfoChimps Geo APIs and it makes available some extremely interesting location data from both public and private sources. The company has created a location data schema to unify sources, which include several place databases, Wikipedia articles and Zillow neighborhood boundaries.