Central Falls, RI
Central Falls is a city in Providence County, Rhode Island, United States. The population was 22,583 at the 2020 census. With an area of only 1.29 square miles 3.3 km2, it is the smallest and most densely populated city in the smallest state, and the 23rd most densely populated incorporated place in the United States. It is also one of only four incorporated places in New England that have a higher population density than the city of Boston ranking second, behind the Massachusetts city of Somerville, an inner suburb of Boston. Source: Wikipedia