US Census API

[Dale Sheldon-Hess]

I'm not sure how long this has been available, but I just saw it on Slashdot.org

http://www.census.gov/developers/

You need to apply to get an access key, but it has info down to the
tract and block level.

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Dale Sheldon-Hess

[Raph Frank]

Key signup is just organisation + email address.

They probably just want to ban used who overload their servers.

http://api.census.gov/data/key_signup.html

For districting, offline data is more useful.