The capital of Massachusetts is BOSTON, which is a six-letter word. BOSTON is the largest city in Massachusetts and the 21st most populous city in the United States. It is one of the oldest cities in the United States, founded in 1630 by Puritan settlers from England. It is also one of the most historically significant cities in the country, having been the site of several major events during the American Revolution. Today, BOSTON is a major cultural, educational, and economic center in the United States.