Reisterstown is an unincorporated community and census-designated place in Baltimore County, Maryland, United States. As of the 2010 census, it had a population of 25,968.

Maryland Route 140 is a 49-mile (79 km) state highway in the U.S. state of Maryland. The route runs from U.S. Route 1 and US 40 Truck in Baltimore northwest to the Pennsylvania border, where the road continues into that state as Pennsylvania Route 16. MD 140 passes through the northern part of central Maryland, connecting Baltimore, Pikesville, Reisterstown, Westminster, Taneytown, and Emmitsburg.