Dorchester, Colonial County of Norfolk, The Colony of Massachusetts Bay, British Colonial America (North America)

In 1793, years of negotiations considering various proposals for grouping towns led to creation of "Norfolk County" by cutting it out of Suffolk and leaving only Boston and Chelsea in Suffolk County The new county line to the south followed the old boundary between Massachusetts Bay and Plymouth Colonies and included Hingham and Cohasset as it continued toward the sea. At the north, it encompassed Roxbury, Dorchester, Hyde Park, Jamaica Plain and Roslindale, all sections of Boston today, and Brookline to the northwest