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Whitinsville is an unincorporated village within the town of Northbridge in Worcester County, Massachusetts, United States. Whitinsville is a census-designated place (CDP) and its population was 6,750 at the 2020 census. Whitinsville is pronounced as if it were spelled "White-ins-ville." It was founded by the Whitin family, after whom it is also named. It is a post office jurisdiction, with a ZIP Code of 01588. It is located on the Mumford River, a tributary of the Blackstone River.