GIS Map
RankingsFloridaHighest radon potential

Counties with the Highest Radon Potential in Florida

The top 25 of 67 Florida 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
1Baker County
3
2Bay County
3
3Bradford County
3
4Brevard County
3
5Broward County
3
6Calhoun County
3
7Charlotte County
3
8Clay County
3
9Collier County
3
10DeSoto County
3
11Dixie County
3
12Duval County
3
13Escambia County
3
14Flagler County
3
15Franklin County
3
16Gadsden County
3
17Gilchrist County
3
18Glades County
3
19Gulf County
3
20Hamilton County
3
21Hardee County
3
22Hendry County
3
23Hernando County
3
24Highlands County
3
25Holmes 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 Florida”, https://gismap.land/rankings/florida/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

More Florida rankings

Richest citiesMost expensive homesMost affordable homesHighest rentMost educatedHighest poverty rateMost densely populatedLargest by populationYoungestOldest by median ageFastest-growingFastest-shrinkingFastest-growing since 2010WarmestColdestSnowiestWettestDriestHighest hazard risk countiesLowest hazard risk countiesHighest expected lossesWorst air qualityCleanest airWorst drought