See today's Glen Mar Park homes for sale & Bethesda MD real estate listings below. At times considered part of the Sumner subdivision, Glen Mar Park is a small neighborhood tucked between Massachusetts Avenue and Sangamore Road. Homes in this neighborhood are spacious on large lots. A nearby neighborhood park provides a playground, tennis court and playing field. See the homes currently on the market in this sought-after close-in Montgomery County community below. Contact your Bethesda, Maryland real estate experts today for information about Glen Mar Park neighborhood properties for sale or to schedule a private home tour.