Arlington is a town in Middlesex County, Massachusetts, United States, six miles (10 km) northwest of Boston. The population was 42,844 at the 2010 census.
Arlington covers 3,517.5 acres (14 km2), or 5.5 square miles, of which 286.2 acres (1.2 km2) are covered by water. There are 210.52 acres (0.9 km2) of parkland. Elevation ranges from 4 feet (1.2 m) above sea level (along Alewife Brook) to 377 feet (114.9 m) near Park Avenue and Eastern Avenue. Arlington borders on the Mystic Lakes, Mystic River, and Alewife Brook. Within its borders are Spy Pond, the Arlington Reservoir, Mill Brook, and Hills Pond.
At the 2010 census, there were 42,844 people, 18,969 households and 10,981 families residing in the town. The population density was 8,239.2 per square mile (3,197.3/km2).
Image: "View of Boston from Robbins Farm Park, Arlington Heights MA" by John Phelan - Own work. Licensed under CC BY 3.0 via Wikimedia Commons.