How many OB-GYNs are there in Massachusetts?

291 active OB-GYNs are listed in Massachusetts per the 2026-05-06 CMS NPPES snapshot. That works out to 4.08 per 100,000 residents using U.S. Census 2024 population estimates.

Where does Massachusetts rank nationally for OB-GYN supply?

Massachusetts ranks 2 of 51 U.S. states + DC by per-capita OB-GYN density. It sits at or below the 10-per-100k underserved threshold used by the parent Fonteum study.

U.S. Centers for Medicare & Medicaid Services NPI Registry (NPPES) — public API Combined with U.S. Census Bureau Population Estimates Program, 2024 Vintage (V2024) Snapshot date: 2026-05-06. The full per-state dataset is published at fonteum.com/research/obgyn-supply-by-state-2026.

PROVIDER ACCESS GAP · STATE

OB-GYNs per 100,000 in Massachusetts

Name: Massachusetts — OB-GYN supply per 100,000
Creator: Fonteum Research
Published: 2026-05-06
License: https://fonteum.com/editorial-policy

4.08 active OB-GYNs per 100,000 residents — ranked 2 of 51 U.S. states + DC.

OB-GYNs per 100,000 residents

4.08

291 active OB-GYNs · 7,136,171 residents · Massachusetts

National rank: 2 / 51
Percentile: 98th
Underserved threshold: 10 / 100k
Quartile: Q1

Comparable areas

Three states whose OB-GYN per-100k density is closest to Massachusetts's — useful for benchmarking.

Connecticutrank 34.03 / 100k
Vermontrank 44.01 / 100k
Marylandrank 53.77 / 100k

Citeable result

Plain-text citation block — paste verbatim into a brief, story, or report.

Massachusetts has 291 active OB-GYNs (4.08 per 100,000 residents) — ranked 2 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: 10 per 100,000. Citation: Fonteum Research, /research/obgyn-supply-by-state-2026.

Source provenance

U.S. Centers for Medicare & Medicaid Services NPI Registry (NPPES) — public API
U.S. Census Bureau Population Estimates Program, 2024 Vintage (V2024)
Snapshot date: 2026-05-06

Open the parent OB-GYN-supply study →

Limitations

This figure measures density (per-capita supply), not access. Drive time, appointment availability, insurance acceptance, and wait times are not modeled here.
The CMS NPPES registry counts NPI-1 individual providers with the relevant taxonomy code. It does not capture PA-led or NP-led practices that operate under a different taxonomy.
NPPES does not publish a county-level field of practice in its public API. County- and ZIP-scoped queries surface state-level density, with the geographic context preserved on this page.
Population is the U.S. Census Bureau 2024 vintage estimate. Population shifts post-2024 are not yet reflected.
The "underserved" threshold is the parent study's transparent baseline cutoff; it is not a regulatory or clinical definition. See the parent study for the rationale.

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Citeable result

Plain-text citation block — paste verbatim into a brief, story, or report.

Massachusetts has 291 active OB-GYNs (4.08 per 100,000 residents) — ranked 2 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: 10 per 100,000. Citation: Fonteum Research, /research/obgyn-supply-by-state-2026.

Limitations

This figure measures density (per-capita supply), not access. Drive time, appointment availability, insurance acceptance, and wait times are not modeled here.

The CMS NPPES registry counts NPI-1 individual providers with the relevant taxonomy code. It does not capture PA-led or NP-led practices that operate under a different taxonomy.

NPPES does not publish a county-level field of practice in its public API. County- and ZIP-scoped queries surface state-level density, with the geographic context preserved on this page.

Population is the U.S. Census Bureau 2024 vintage estimate. Population shifts post-2024 are not yet reflected.

The "underserved" threshold is the parent study's transparent baseline cutoff; it is not a regulatory or clinical definition. See the parent study for the rationale.