The Montgomery County government operates Ride-On, one of the oldest bus services in the area. Ride-On provides connections to Metrorail, Metrobus and MARC stations. Ride-On operates seven days a week, but some buses run only on weekdays. The St. Mary's Transit System runs four bus routes hourly on weekdays from 6 a.m. to 6 p.m. between Lexington Park and Leonardtown, around Leonardtown, and around Great Mills, with connections to the Patuxent Naval Base shuttle. Most routes ferry people from outlying areas into Waldorf or St. Charles.
Trips are occasional, and many routes only run on one day a week.