http://www.broadbandmap.gov/technology
QuoteThe National Broadband Map (NBM) is a searchable and interactive website that allows users to view broadband availability across every neighborhood in the United States. The NBM was created by the National Telecommunications and Information Administration (NTIA), in collaboration with the Federal Communications Commission (FCC), and in partnership with 50 states, five territories and the District of Columbia. The NBM is a project of NTIA's State Broadband Initiative. The NBM will be updated approximately every six months and was first published on February 17, 2011.
(http://www.digitaltrends.com/wp-content/uploads/2011/02/national-broadband-map-650x343.jpg)
Doesn't look like you'd want to live in Alaska.
Seeing as the Internet is pretty much controlled by Uncle Sam and a good proportion of the Tier 1 backbone providers are American I would have thought that you'd be able to get high speed access pretty much anywhere in the US.