Duncan Knoll is a populated place LOCATED WITHIN the City of Chicopee. In turn, the City of Chicopee is located within Hampden County.
Duncan Knoll is located at latitude 42.206 and longitude -72.554.
Since Duncan Knoll is located within the City of Chicopee, all of the census and demographic data for residents of Duncan Knoll are included as part of the information reported for City of Chicopee in the "Profile" tab above.