Maryland Route 320

Maryland Route 320
Piney Branch Road
Maryland Route 320 highlighted in red
Route information
Maintained by MDSHA
Length	2.84 mi[1] (4.57 km)
Existed	1927–present
Major junctions
South end	Piney Branch Road at the District of Columbia boundary in Takoma Park
Major intersections	MD 410 in Takoma Park MD 193 in Silver Spring
North end	MD 650 in Adelphi
Location
Country	United States
State	Maryland
Counties	Montgomery, Prince George's
Highway system
Maryland highway system Interstate US State Scenic Byways
← MD 318 → MD 322

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 in 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 was widened over its whole length in the late 1940s and reduced to its present course in the mid-1950s.