Contiguous Counties Database

Each County with Bordering Counties

This product contains a current record of each U.S. county and its bordering counties. Counties that share a common boundary are listed in this contiguous counties database product, even when crossing state lines. We’ve also been careful to include contiguous counties separated by rivers, canals, and other waterways. In such cases, bordering counties may edge each side of the waterway but not technically touch. Therefore, we use waterway centerlines when warranted.
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Contiguous Counties Database

This contiguous counties database can be used for researching surrounding counties and communities. It is beneficial for medical research, health insurance research and may be used in Medicare / Medicaid research. It is also used by colleges and universities in analysis of bordering counties. Learn more: view the Contiguous Counties Product Documentation / Watch our Accuracy Matters video

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Related Links

County List By ZIP Code