The CensusCity SDK provides data to work in projects related to population, income, and any other Census data. It has been designed with modularity in mind to interact with Census Bureau APIs, Energy Information Agency, USDA Farmer's Market directory, and Socrata. Community modules include ArcGIS and U.S. Housing and Urban Development. Get started at http://uscensusbureau.github.io/citysdk/gettingstarted.html
The US Census is a treasure trove of valuable information for many people. From salesmen trying to market to curious people trying to learn about new cultural trends, the Census is a great source of information. Accessing this data in a computer readable form is sometimes difficult, however. The USA Today Census API simplifies the process, at least for the 2010 census.
Factual continues to expand the world's access to data with a makeover and relaunch of its Geopulse API. Now renamed, Geopulse Context aims to provide developers with the geographic and commercial context of locations to enable personalized app experiences. The new API expands US Census data and commercial metrics available via Factual APIs.