Newtonville is a populated place LOCATED WITHIN the City of Newton. In turn, the City of Newton is located within Middlesex County.
Newtonville is located at latitude 42.35 and longitude -71.204.
Since Newtonville is located within the City of Newton, all of the census and demographic data for residents of Newtonville are included as part of the information reported for City of Newton in the "Profile" tab above.