Hot 97 - aka WQHT is a hip hop radio station for New York City public. The radio broadcast at 97.1 FM.

The radio had got a bunch of famous DJs such: Mister Cee
(Calvin Laburn - the legend used to work with Big Daddy Kane), Funkmaster Flex (Aston George Taylor), DJ Kay Slay and DJ Whoo Kid (G-Unit). More known hip hop figures like the Angie Martinez (also a female rapper).
Hot 97 is the most famous hip hop station playing rap and hip hop vibe music 24/7.

http://www.hot97.com/

Power 106 - aka KPWR is L.A's hip hop radio directly from California to all Greater L.A. area.
The station is concentrated on hip hop music since the early 90's.
The station got some famous hip hop DJs such as the west coast DJ Felli Fel and Big Boy (not to be confused with Big Boi from Outkast).

http://www.power106.fm/