TOWN OF BROOKLINE
Brookline is a town in Norfolk County, Massachusetts, in the United States, and is a part of Greater Boston. Brookline borders six of Boston’s neighborhoods: Brighton, Allston, Fenway–Kenmore,Mission Hill, Jamaica Plain, and West Roxbury. The city of Newton lies to the west of Brookline. At the 2010 census, the population of the town was 58,732. Brookline was first settled in 1638 as a hamlet in Boston, but was incorporated as a separate town in 1705.
Brookline was known as the hamlet of Muddy River and was considered part of Boston until the Town of Brookline was independently incorporated in 1705. (The Muddy River was used as the Brookline-Boston border at incorporation.) It is said that the name derives from a farm therein once owned by Judge Samuel Sewall.
According to the U.S. Census Bureau, Brookline has a total area of 6.8 sq mi (17.7 km2), all but 0.039 sq mi (0.1 km2) (0.44%) of which is land.
The northern part of Brookline, roughly north of the D-line tracks, is urban in character, as highly walkable and transit rich. The population density of this part of town is nearly 20,000 inhabitants per square mile (8,000/km2), on a par with the densest neighborhoods in nearby Cambridge, Somerville and Chelsea, Massachusetts (the densest cities in New England), and just below that of central Boston’s residential districts (Back Bay, South End, Fenway, etc.). The overall density of Brookline, which also includes suburban districts and grand estates south of the D-line, is still higher than that of many of the largest cities in the United States, especially in the South and West. Brookline borders Newton (part of Middlesex County) to the west and Boston (part of Suffolk County) in all other directions; it is therefore non-contiguous with any other part of Norfolk County. Brookline became an exclave in 1873, when the neighboring town of West Roxbury was annexed by Boston (and left Norfolk County to join Suffolk County), and Brookline refused to be annexed by Boston after the Boston–Brookline annexation debate of 1873.