Maryland State Highway 45, the majority of which is known locally as York Road with a several mile section known as Greenmount Avenue, is a main road from US 1 (North Avenue) in Baltimore, Maryland north to the Pennsylvania state line, where it continues to York, Pennsylvania. Until a bypass (now I-83) was built in the 1950s, it was the path of US 111; the road now serves mostly local traffic due to I-83. However, south of the Baltimore Beltway (I-695), MD 45 was US 111 until 1963, when US 111 was decommissioned .

MD 45 passes through the Baltimore suburbs of Towson, Lutherville-Timonium and Cockeysville. Within the Baltimore city limits, the historic Senator Theater is on the road. In Towson, MD 45 passes through the Towson Circle , the first modern roundabout in Maryland. The road name changes from York Road to Greenmount Avenue in Baltimore where it crossed the Baltimore city line that existed from 1888 to 1917. After 1917, the portion annexed by Baltimore City remained as York Road and was never changed to Greenmount Avenue.

Maryland State Highway 45 Bypass is a short bypass around the west side of downtown Towson, signed by Baltimore County.

External links

• MDRoads - MD 45