North Attleborough, alternatively spelled North Attleboro, is a city in Bristol County, Massachusetts, United States. The population was 30,834 a…North Attleborough, alternatively spelled North Attleboro, is a city in Bristol County, Massachusetts, United States. The population was 30,834 at the 2020 United States Census. The villages of Attleboro Falls and North Attleborough Center are located in the city.