The U.S. physician landscape.
How many physicians practice in the United States — and why every published total is different. Every figure cited to its source. Last reviewed 2026-07-11; refreshed annually.
About a million active physicians — depending on how you count.
active physicians in the U.S. in 2024 — 304 per 100,000 people (AAMC) [1]
of them in direct patient care (AAMC, 2024) [1]
active state-licensed MD/DO physicians as of April 2025 — 535,542 in primary care, 570,655 specialists (KFF) [2]
physicians in California — more than any other state (2024) [3]
By state, the largest physician populations track the largest general populations — California leads, followed by states such as New York, Texas, Florida, and Pennsylvania, per KFF's state-level counts. [2]
Why no two totals agree.
AAMC counts roughly 1.03 million active physicians for 2024; KFF counts about 1.11 million as of April 2025. Neither is wrong — they measure different things (workforce activity vs. active state licenses, at different dates, from different underlying files). Licenses outnumber practicing physicians; registries outnumber both — and no single official headline count of NPI records is published the way AAMC and KFF publish their physician totals, which is why any provider count is only as good as its stated methodology.
This is the core data-quality lesson for anyone selling to providers: a “physician count” without a definition attached is a marketing number. It is also why every field in Oystercatcher carries its source and verification status — see how our provenance model works.
The largest specialties.
From the most recent standalone AAMC specialty report (2021 data) — primary care dominates the physician workforce:[4]
Whatever slice of this landscape you sell into, Oystercatcher scores 2.5M+ U.S. physicians in depth across six public datasets — and explains every score. How the scoring works.
Where every number comes from.
National active-physician and direct-patient-care totals; per-100,000 ratios.
Active state-licensed MD/DO counts, split primary care vs. specialist; state-level table.
California count and top-five state ranking.
Active-physician counts by specialty; the most recent standalone specialty report.
Methodology: figures are quoted from the cited publications with their original definitions and as-of dates — we do not average, model, or reconcile them, because the differences are informative. The KFF national total (~1.11M) is the sum of KFF's published primary-care and specialist counts. Maintained by Oystercatcher Research; re-verified annually. Statistics belong to their publishers.
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