, is an historic neighborhood of 4.4 sq. miles in Boston, Suffolk County, Massachusetts, United States. Founded by Boston Puritans seeking farm land to the south, it was originally part of the city of Roxbury. The community seceded from Roxbury as a part of the new town of West Roxbury in 1851, and became part of Boston when West Roxbury was annexed to Boston in 1874. In the 19th century, Jamaica Plain became one of the first Streetcar Suburbs in America and home to a significant portion of Boston's Emerald Necklace of parks, designed by Frederick Law Olmsted. According to an official city estimate, it had a population of 38,196 in October 2003.