Roxbury is a dissolved municipality and a currently officially recognized neighborhood of Boston, Massachusetts, U.S. Roxbury is one of 21 official neighborhoods of Boston, used by the city for neighborhood services coordination. The city asserts that it "serves as the heart of Black culture in Boston."
Roxbury was one of the first towns founded in the Massachusetts Bay Colony in 1630, and became a city in 1846 until annexed to Boston on January 5, 1868. The original town of Roxbury once included the current Boston neighborhoods of Jamaica Plain, Roslindale, West Roxbury, the South End and much of Back Bay. Roxbury now generally ends at Hammond Street, Davenport Street to the east, and East Lenox Street/Melnea Cass Boulevard to the south.
The original boundaries of the Town of Roxbury can be found in Drake's History of Roxbury and its noted Personages. Those boundaries include the Christian Science Center, the Prudential Center (built on the old Roxbury Railroad Yards) and everything south and east of the Muddy River including Symphony Hall, Northeastern University, Boston Latin School, John D. O'Bryant School of Mathematics & Science, Y.M.C.A., Harvard Medical School and many hospitals and schools in the area. This side of the Muddy River is Roxbury, the other side is Brookline and Boston. Franklin Park, once entirely within Roxbury when Jamaica Plain, West Roxbury and Roslindale were villages within the town of Roxbury until 1854, has been divided with the line between Jamaica Plain and Roxbury located in the vicinity of Peter Parley Road on Walnut Avenue, through the park to Columbia Road. Here, Walnut Avenue changes its name to Sigourney Street, indicating the area is now Jamaica Plain. One side of Columbia Road is Roxbury, the other Dorchester. [elnea Cass Boulevard is located approximately over the Roxbury Canal that brought boats into Roxbury, bypassing the busy port of Boston in the 1830s.
Readable, Vital Records of Roxbury, Massachusetts..., Vol.1 at HathiTrust.org 
Norfolk County, Massachusetts was created on March 26, 1793 by legistation signed by Gov. John Hancock. Most of the towns were originally part of Suffolk County, Massachusetts. The towns of Dorchester and Roxbury were part of Norfolk County when it was created but, as Boston gradually annexed them, they returned to be part of Suffolk County.