 At the county's formation, Hingham and Hull were to be part of it, but joined Plymouth County instead, leaving Cohasset as the initial exclave of Norfolk County and an enclave of Plymouth County.Brookline became the second exclave of Norfolk County in 1873 when the neighboring town of West Roxbury was annexed by Boston (thus leaving Norfolk County to join Suffolk County) and Brookline refused to be annexed by Boston after the Brookline-Boston annexation debate of 1873.At the 2000 census there were 650,308 people, 248,827 households, and 165,967 families residing in the county.