Idaho Counties With the Highest Cancer Rates

New data shows which Idaho counties have the highest cancer diagnosis rates.

Published on Feb. 16, 2026

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New data from the National Cancer Institute and CDC reveals the 15 Idaho counties with the highest diagnosed cancer rates between 2017 and 2021. The list includes several rural counties where access to screenings and specialists can be limited, highlighting the importance of early detection.

Why it matters

Cancer diagnosis rates in Idaho's rural counties are higher than the state average, likely due to limited access to preventative screenings and specialists. This data can help raise awareness and encourage residents in high-risk areas to have open conversations with their doctors about any concerning symptoms.

The details

The data shows that 9 of the 15 counties with the highest diagnosed cancer rates in Idaho are rural counties, where access to cancer screenings and specialists can be more limited. Early detection is crucial, as seen in the stories of Cassandra Costley and actor James Van Der Beek, who both initially dismissed their symptoms before being diagnosed with advanced cancer.

  • The data covers cancer diagnosis rates in Idaho counties from 2017 to 2021.

The players

Cassandra Costley

A 39-year-old woman who passed away from stage 4 colon cancer after initially dismissing her symptoms as hemorrhoids.

James Van Der Beek

An actor who passed away from colorectal cancer after initially attributing changes in his bowel movements to his coffee consumption.

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The takeaway

This data highlights the need for increased access to cancer screenings and preventative care, especially in Idaho's rural communities, where diagnosis rates are the highest. By having open conversations with their doctors about any concerning symptoms, residents in high-risk areas can improve their chances of early detection and better treatment outcomes.