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Homefacts City Report. Wellesley is located in Norfolk County, MA. The population is , making Wellesley the 9th largest city in Norfolk County. There are 9 public schools in Wellesley with an average Homefacts rating of A. The total crime rate for Wellesley is very low, and there are 0 registered sex offenders residing in the city.
Pittsfield is the largest city by population in Berkshire County, and ranks 27th out of the 351 cities and towns in Massachusetts. The population density was 1,124.3 people per square mile (434.1/kmÂ²), making it the most densely populated community in county and 92nd overall in the Commonwealth.