The gap between Barclay and Templeville was filled in the late 1930s. MD 302 was extended west toward Church Hill in the late 1940s and to US 301 in the mid-1960s.
The gap between Barclay and Templeville was closed during the late 1930s. MD 302 was extended westward towards Church Hill in the late 1940s, and to US 301 in the mid-1960s.