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Counties with the Highest Radon Potential in Oklahoma

The top 25 of 77 Oklahoma counties on GIS Map, ranked by EPA radon zone, where zone 1 carries the highest predicted indoor radon potential and zone 3 the lowest.

#CountyEPA radon zone
1Alfalfa County
3
2Atoka County
3
3Beckham County
3
4Blaine County
3
5Bryan County
3
6Caddo County
3
7Canadian County
3
8Carter County
3
9Choctaw County
3
10Cleveland County
3
11Coal County
3
12Comanche County
3
13Cotton County
3
14Craig County
3
15Creek County
3
16Custer County
3
17Dewey County
3
18Garfield County
3
19Garvin County
3
20Grady County
3
21Grant County
3
22Greer County
3
23Harmon County
3
24Harper County
3
25Haskell County
3

Source: EPA Map of Radon Zones (September 2025). All counties with data are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Counties with the Highest Radon Potential in Oklahoma”, https://gismap.land/rankings/oklahoma/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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