90.1 MtRock

Mt Rock Nation Your Hit Music Station

90.1 MtRock logo

90.1 MtRock (KSAK, 90.1 FM) is a Variety radio station licensed to Walnut, CA, and serves the Los Angeles radio market. The station is currently owned by Mount San Antonio College.

  • Call sign: KSAK
  • Frequency: 90.1 FM
  • City of license: Walnut, CA
  • Format: Variety
  • Owner: Mount San Antonio College
  • Area Served: Los Angeles


  • Address: 1100 N Grand Ave, Walnut, CA 91789
  • Phone number: (909) 274-4619
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