Duxbury (alternative older spelling: "Duxborough") is a historic seaside town in Plymouth County, Massachusetts, United States. A suburb located on the South Shore approximately 35 miles (56 km) to the southeast of Boston, the population was 16,090 at the 2020 census.Geographic and demographic information on the specific parts of the town of Duxbury is available in the articles Duxbury (CDP), Green Harbor, and South Duxbury.