where is LTE 4G data offered in USA?

[haven]

http://money.cnn.com/interactive/technology/4G-coverage-map/

CNN has a web page with links to the major cell carriers showing where LTE service is available in USA. Click on the "Verizon", "ATT" and "Sprint" links to view. LTE phones will drop back to 3G speed when outside the identified service areas.

Not shown is T-Mobile, which won't offer LTE in USA until mid-2013. However, T-Mobile has a speedy 4G alternative of its own that works well. Here's the T-Mobile map: http://t-mobile-coverage.t-mobile.com/Map.aspx

 

[haven]

Here's another list, this time showing which cities have LTE service. Sorry, Prescott, no love from the carriers yet.
http://www.theverge.com/2012/9/21/3367602/iphone-5-lte-markets-cities

This sort of list goes out of date very quickly. ATT is working diligently to add LTE, and Verizon is adding more cities every month. Sprint and T-Mobile, not so much.