Brookline is a town in Norfolk County, Massachusetts, United States, which borders on the cities of Boston and Newton. As of the 2010 census, the population of the town was 58,732.
Brookline was known as the hamlet of Muddy River (a river which today makes up part of the Brookline-Boston border) and was considered a part of Boston until the Town of Brookline was independently incorporated in 1705. Its name is derived from the brooks that created the town lines with the former towns of Brighton and Roxbury, which are both now parts of Boston.
According to the U.S. Census Bureau, Brookline has a total area of 6.8 square miles (17.7 km²), of which, 6.8 square miles (17.6 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.44%) is water.