KZGU

The station was assigned the KPXP call letters by the Federal Communications Commission on July 12, 1991.^[2] The station changed to its current KZGU call sign on April 21, 2014, coinciding with its move to Guam from the Northern Mariana Islands. At the same time, the former KRSI became KPXP, retaining the Power 99 name and format despite being on 97.9 MHz.

On October 12, 2023, Sorensen Media Group opted to sell the station to Glimpse Media, and after a lot of speculation about the station's future. On the next day, radio station signed off together with sister stations KGUM-FM, KGUM (AM) and KZGZ, due to a format changes.

On March 8, 2025, KZGU relaunched for 98.7 into country music as "Route 99".

• Route 99 FM Official Website
• Facility details for Facility ID 60854 (KZGU) in the FCC Licensing and Management System

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