From the US Chess Federation website:
* Senior Master 2400 & up
* Master 2200-2399
* Expert 2000-2199
* Class A 1800-1999
* Class B 1600-1799
* Class C 1400-1599
* Class D 1200-1399
* Class E 1199-1000
* Class F 999-800
* Class G 799-600
* Class H 599-400
* Class I 399-200
* Class J 199/below
* Minimum rating is 100
https://secure.uschess.org/tla/tlaschedule.php
Titles such as Grandmaster, Internation Master, etc. are granted by FIDE. http://www.fide.com/official/handbook.asp?level=B0101
RHP ratings are meaningful only for play at RHP.