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U.S. Counties within 100 miles of border

Writer's picture: Juan M. PedrozaJuan M. Pedroza

Which counties are within 100 miles of any U.S. border? Here's a look at what that looks like.


Of course, all Hawaiian and Puerto Rican (plus nearly all Alaskan) counties are on the list:

Zooming into the lower 48, we can see which counties are with the 100-mile border.

Total counties overlapping within the 100 miles buffer: 1,298 or 40 percent of all counties.*


How many people live in these counties? About two-thirds of the U.S. population based on recent, county-level population estimates from the American Community Survey (2016-2020).


* For some counties, only a section touches the 100 mile buffer. In others, the entire county is fully contained within the buffer.

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Juan Manuel Pedroza

Assistant Professor, UCSC

Sociology Ph.D.

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