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Counties with the Highest Radon Potential in Kentucky

The top 25 of 120 Kentucky 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
1Ballard County
3
2Calloway County
3
3Carlisle County
3
4Fulton County
3
5Graves County
3
6Hickman County
3
7Marshall County
3
8McCracken County
3
9Anderson County
2
10Bath County
2
11Bell County
2
12Boone County
2
13Boyd County
2
14Bracken County
2
15Breathitt County
2
16Breckinridge County
2
17Butler County
2
18Caldwell County
2
19Campbell County
2
20Carroll County
2
21Carter County
2
22Christian County
2
23Clay County
2
24Clinton County
2
25Crittenden County
2

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 Kentucky”, https://gismap.land/rankings/kentucky/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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