How many dermatologists are in Cook County?

NPPES does not publish a county-level field of practice in its public API. Cook County sits within Illinois, which lists 731 active dermatologists (5.75 per 100,000) per the 2026-05-06 snapshot. State-level density is the most precise public-source figure available for county queries.

Is Cook County considered underserved for dermatologists?

Illinois sits above the 4-per-100k threshold the parent Fonteum study uses for "underserved." Whether Cook County specifically is underserved relative to the rest of the state requires county-level field-of-practice data that NPPES does not publish.

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: 2026-05-06. Full per-state dataset: fonteum.com/research/dermatology-provider-supply-by-state-2026.

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PROVIDER ACCESS GAP · COUNTY

dermatologists per 100,000 — Cook County, IL

Name: Cook County (IL) — dermatologist supply context
Creator: Fonteum Research
Published: 2026-05-06
License: https://fonteum.com/editorial-policy

Cook County (5,188,791 residents) sits within Illinois, where dermatologists are listed at 5.75 per 100,000.

Geographic scopeCook County sits within Illinois. The figure below reports Illinois-wide density; NPPES does not publish a county-level field of practice in its public API, so a state-level figure is the most precise public-source measure available.

dermatologists per 100,000 residents

5.75

731 active dermatologists · 12,710,158 residents · Illinois

National rank: 16 / 51
Percentile: 71th
Underserved threshold: 4 / 100k
Quartile: Q2

Comparable areas

Three states whose dermatologist per-100k density is closest to Illinois's — useful for benchmarking.

Hawaiirank 17

5.74 / 100k

Oregonrank 185.66 / 100k

Arizonarank 195.62 / 100k

Citeable result

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

Illinois has 731 active dermatologists (5.75 per 100,000 residents) — ranked 16 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: 4 per 100,000. Citation: Fonteum Research, /research/dermatology-provider-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 dermatologist-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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Compliance posture