On July 4, 1987, WFPT (licensed to Frederick) signed on to fill coverage gaps in the outer Washington market, while WGPT in Oakland began operations to cover the extreme west of the state, much of which previously had no local television service at all.

[1] In September 2015, as part of budget cuts, MPT outsourced its master control operations to Public Media Management—a joint venture of Boston PBS member WGBH and Sony Corporation.

[2] The MPT stations are: Download coordinates as: Notes: WGPT is assigned to the Pittsburgh, Pennsylvania, market and elects must-carry status on satellite providers there.

[34] MPT joined the Baltimore market's ATSC 3.0 lighthouse station, hosted at WNUV, on June 24, 2021.

[35] In return, WMPT and WMPB hosts WNUV's main channel (54.1) to preserve coverage for existing ATSC 1.0 TV sets.