WMMJ is a top-rated Jammin' Oldies-leaning Urban Adult Contemporary radio station owned by Radio One in the Washington, D.C., market. It is co-owned with WKYS, WOL, WPRS-FM, and WYCB and has studios located in Silver Spring, Maryland. It is licensed to Bethesda, but its transmitter is located in Tenleytown. During the 1960s, '70s, and early '80s, the station had been home to the original "progressive rock" formatted WHFS, which later migrated to the higher powered Annapolis, Maryland-based 99.1 frequency.
WMMJ broadcasts in the HD format.