Maryland Route 390 (MD 390) is a state highway in the U.S. state of Maryland. The highway runs 1.09 miles (1.75 km) from 16th Street at the District of Columbia boundary north to MD 97 within Silver Spring. MD 390 is a six-lane divided highway continuation of 16th Street into Maryland and serves as a western bypass of downtown Silver Spring. The portion of the highway south of MD 410 was constructed around 1930. MD 390 was extended north to MD 97 as a divided highway in the late 1950s.