22.22 active chiropractors per 100,000 residents — ranked 36 of 51 U.S. states + DC.
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Massachusetts has 1,586 active chiropractors (22.22 per 100,000 residents) — ranked 36 of 51 U.S. states + DC. Source: CMS NPPES NPI Registry + U.S. Census Bureau, snapshot 2026-05-06. Threshold for "underserved" in the parent study: 15 per 100,000. Citation: Fonteum Research, /research/chiropractor-supply-by-state-2026.