About: Maryland Route 320

Maryland Route 320 (MD 320) is a state highway in the U.S. state of Maryland. Known as Piney Branch Road, the highway runs 2.84 miles (4.57 km) from Eastern Avenue at the District of Columbia boundary in Takoma Park north to MD 650 in Adelphi. MD 320 is a southwest–northeast highway that connects Takoma Park and Silver Spring in southeastern Montgomery County with Adelphi in far western Prince George's County. The state highway originally extended from downtown Silver Spring to White Oak and connected with U.S. Route 29 (US 29) at both ends. The Silver Spring–Adelphi portion of the highway was constructed by 1910. The segment through Takoma Park and the Adelphi–White Oak segment, which later became MD 650, were built in the early 1930s; the Takoma Park portion was built as MD 513. MD 320 w