Wikipedia
WACO-FM (99.9 FM, "WACO 100") is a iHeartMedia, Inc. owned radio station located in Waco, Texas. The station brands itself as "WACO 100, a station so big they named the entire city after it." The station can be heard from Dallas/Ft. Worth to Austin, Texas. Studios are located along Texas State Highway 6 in southwest Waco, and the transmitter is south of city limits, northeast of the town of Moody in extreme southwestern McLennan County.
WACO-FM is one of three stations in the United States where the call letters spell out the name of the city of license. (The other stations are WARE-AM in Ware, Massachusetts and WISE-FM in Wise, Virginia, a satellite of WVTF.) WACO-FM is also one of a small number of callsigns whose beginning letter deviates from FCC standards ("W" is typically assigned to stations east of the Mississippi; Waco's other stations begin with "K" but WACO-FM was co-owned with the original WACO on AM and thus was able to keep the W callsign though the AM moved and dropped the W call in 1996).