Boston is in Massachusetts, USA.

knowledge extension:

Boston is the capital and largest city of Massachusetts, and the largest city in New England. Located on the Atlantic coast in the northeast of the United States, it was founded in 163 and is one of the oldest and most culturally valuable cities in the United States.

Boston is the center of higher education and medical care in the northeast of the United States, and the city with the highest education level in the United States. Its economic foundation is scientific research, finance and technology-especially bioengineering, and it is considered as a global city or a cosmopolitan city.