Either "Residents of Massachusetts" or the more colloquial "Mass-holes"
Bay Staters
Massachusetts residents, on average, have very high mortgages in comparison to the rest of the United States. The average mortgage is around $220,000 making Massachusetts ranked as the sixth highest state in the nation.
Boston, with about 340,000 million residents.
Maine residents are called Mainers!
Residents of Haiti are called Haitians.
According to the US Census, there are 634,910 residents for each Massachusetts house seat.
Maryland's residents are called "Marylanders."
The residents of Epirus are called Epirotes. Although, Epirus is a region of multiple towns. The capital is Ioannina and they are called Gianiotes. Another town is Zagoria and the residents there are called Zagoriani. The beautiful town of Parga where the residents there are called Pargini.
Rīdzinieki (in Latvian) Рижане (in Russian)
Massachusetts
they are called romanians
They are called Pennsylvanians.