Milford Mill Road, Slade Avenue, and Smith Avenue are a long road mostly in Baltimore County, Maryland that runs through Milford Mill and Pikesville in the suburbs of Baltimore. The road starts out at the light rail stop in historic Mt. Washington Village in Baltimore city as Smith Avenue, and continues through Pikesville up to Seven Mile Lane before its name changes to Slade Avenue, and the road widens to four lanes. The road is known as Slade Avenue until Reisterstown Road, and from there, its name becomes Milford Mill Road until it dead-ends one block south of Rolling Road in an area known as Windsor Mill. It is one of the most heavily used routes in the northwest suburbs of Baltimore, as it is used for cross-county travel by motorists between the Pikesville and Randallstown areas.
At one time, each road with its own name was a separate road, and they did not connect. A small section of Slade Avenue, which still independently exists today, ran from Seven Mile Lane parallel to Smith Avenue, then curved into Smith. This was prior to construction of the four-lane Slade Avenue that runs into Smith.
At this time, Milford Mill Road was a separate road off Reisterstown Road in the Colonial Village area, and it began two blocks south of the intersection of Reisterstown and Slade.
In 1987, in conjunction with the construction of the Milford Mill Metro Subway Station, parts of Milford Mill Road were relocated in order to provide better access to this station, and Slade/Milford Mill became a single road.
A new overpass was constructed over the Western Maryland Railway where the Metro Subway would eventually run, and a new section was built that would merge into the old part of Slade Avenue. In order to make way for this new segment, several buildings of an apartment complex, then known as the Warren Park Apartments, and currently identified as the Milford Station Apartments, had to be demolished.