i live in the area and am skeptical that anyone uses the full name in day to day contexts the dominant newspaper salem news still uses manchester the police department answers their phone manchester pd high school students refer to manchester high i understand the urge to distinguish itself from the much larger manchester nh nearby but imho this was really just a change on paper the only time i hear anyone affix by the sea in day to day speech they also add technically as in i live in manchester well manchester by the sea technically i think the article should be reworded to reflect that that most locals use stuff doesn't pass my bs meter but i'll wait to hear what others think