Federal Open Data External Links
Data.gov is a project with the goal of providing federal data for many purposes all in one location with up to date and accurate documentation. "Data.gov is a rich resource for civic hackers, tech entrepreneurs, data scientists, and developers of all stripes. Here you’ll find information about APIs, open source projects, and relevant developer resources across government."
Data.gov does just that; it provides information usually scattered accross a multitude to varrious websites all in one place that's easily searchable.
The site also provides links to many other open data providers . These include all scales from cities, counties, states, and even many other nations!