I think you misspelled several places in Massachusetts (and possibly elsewhere), because I didn't get them when writing their names. These are just the ones I found, there may be more. Agawam, Attlesboro, Barnstable, Braintree, Bridgewater, Framington, Franklin, Marlborough (fills in neighboring Hudson instead), Randolph, Southampton, Watertown, West Springfield, Weymouth, Winthrop
Otherwise, great quiz. I can't imagine how much work went into this, so it's understandable if some mistakes slip in.
For some reason, census.gov includes them as "[City name] Town", like Agawam is Agawam Town, as of right now I don't have the time to fix it but I'll probably do it in the next week or so.
What is the size of the svg file though?
Otherwise, great quiz. I can't imagine how much work went into this, so it's understandable if some mistakes slip in.