Methodology
We licensed data on healthcare professionals through HealthLink Dimensions, which provides the largest verified, independently audited database of healthcare professionals in the U.S. Data is current as of June 2026. We included professionals if they (1) were a doctor of medicine or doctor of osteopathic medicine; (2) had any of the following listed in their specialty description: medical oncology, hematology oncology, radiation oncology, surgical oncology, gynecologic oncology, urologic oncology, pediatric oncology, pediatric hematology/oncology; (3) were located in one of the 50 U.S. states or the District of Columbia; and (4) had accurate location mapped to them. We mapped professionals to the 2020 U.S. Census county via the 2020 Census tract. A professional may have more than one specialty and/or more than one active location. We used unique professional counts to estimate the total number of oncologists per county. The total count of practicing, licensed oncologists may be higher than the number of professionals we mapped.
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