Seekonk is a town in Bristol County, Massachusetts, United States, on the Massachusetts border with Rhode Island. It was incorporated in 1812 from the western half of Rehoboth. The population was 15,531 at the 2020 census. It contains the census-designated place of North Seekonk. In 1862, under a U.S. Supreme Court decision resolving a longstanding border dispute between Massachusetts and Rhode Island, a portion of Tiverton, Rhode Island was awarded to Massachusetts to become part of Fall River, while two-thirds of Seekonk was awarded to Rhode Island.