Locations and reportsLocation index
Radon data by state and county
56 states and territories covering 3,231 counties. Every place below has a report; choose a state to browse its counties, or open the state report itself.
Search
Find a place
Radon data is published by county and by state. An address, city or ZIP code opens the county it lies in.
By state
Choose a state
Click a state on the map, or open a region. Each state shows how many of its counties EPA places in Zone 1, the highest predicted potential; the states with the most are ranked on the national report.
Choose a state on the map, or find it by name. State outlines: U.S. Census Bureau cartographic boundary files.
Northeast
- Connecticut4 of 8 counties in Zone 1
- Maine12 of 16 counties in Zone 1
- Massachusetts3 of 14 counties in Zone 1
- New Hampshire1 of 10 counties in Zone 1
- New Jersey7 of 21 counties in Zone 1
- New York34 of 62 counties in Zone 1
- Pennsylvania49 of 67 counties in Zone 1
- Rhode Island2 of 5 counties in Zone 1
- Vermont0 of 14 counties in Zone 1
Midwest
- Illinois56 of 102 counties in Zone 1
- Indiana57 of 92 counties in Zone 1
- Iowa99 of 99 counties in Zone 1
- Kansas65 of 105 counties in Zone 1
- Michigan9 of 83 counties in Zone 1
- Minnesota68 of 87 counties in Zone 1
- Missouri11 of 115 counties in Zone 1
- Nebraska53 of 93 counties in Zone 1
- North Dakota53 of 53 counties in Zone 1
- Ohio53 of 88 counties in Zone 1
- South Dakota48 of 66 counties in Zone 1
- Wisconsin28 of 72 counties in Zone 1
South
- Alabama13 of 67 counties in Zone 1
- Arkansas0 of 75 counties in Zone 1
- Delaware0 of 3 counties in Zone 1
- District of ColumbiaIts one county is not in Zone 1
- Florida0 of 67 counties in Zone 1
- Georgia4 of 159 counties in Zone 1
- Kentucky30 of 120 counties in Zone 1
- Louisiana0 of 64 counties in Zone 1
- Maryland8 of 24 counties in Zone 1
- Mississippi0 of 82 counties in Zone 1
- North Carolina8 of 100 counties in Zone 1
- Oklahoma0 of 77 counties in Zone 1
- South Carolina1 of 46 counties in Zone 1
- Tennessee39 of 95 counties in Zone 1
- Texas0 of 254 counties in Zone 1
- Virginia62 of 133 counties in Zone 1
- West Virginia20 of 55 counties in Zone 1
West
- Alaska0 of 29 counties in Zone 1
- Arizona0 of 15 counties in Zone 1
- California2 of 58 counties in Zone 1
- Colorado53 of 64 counties in Zone 1
- Hawaii0 of 5 counties in Zone 1
- Idaho19 of 44 counties in Zone 1
- Montana49 of 56 counties in Zone 1
- Nevada9 of 17 counties in Zone 1
- New Mexico7 of 33 counties in Zone 1
- Oregon0 of 36 counties in Zone 1
- Utah7 of 29 counties in Zone 1
- Washington7 of 39 counties in Zone 1
- Wyoming21 of 23 counties in Zone 1
Territories
- Alabama13 of 67 counties in Zone 1
- Alaska0 of 29 counties in Zone 1
- American Samoa3 counties, no zone on file
- Arizona0 of 15 counties in Zone 1
- Arkansas0 of 75 counties in Zone 1
- California2 of 58 counties in Zone 1
- Colorado53 of 64 counties in Zone 1
- Connecticut4 of 8 counties in Zone 1
- Delaware0 of 3 counties in Zone 1
- District of ColumbiaIts one county is not in Zone 1
- Florida0 of 67 counties in Zone 1
- Georgia4 of 159 counties in Zone 1
- Guam1 county, no zone on file
- Hawaii0 of 5 counties in Zone 1
- Idaho19 of 44 counties in Zone 1
- Illinois56 of 102 counties in Zone 1
- Indiana57 of 92 counties in Zone 1
- Iowa99 of 99 counties in Zone 1
- Kansas65 of 105 counties in Zone 1
- Kentucky30 of 120 counties in Zone 1
- Louisiana0 of 64 counties in Zone 1
- Maine12 of 16 counties in Zone 1
- Maryland8 of 24 counties in Zone 1
- Massachusetts3 of 14 counties in Zone 1
- Michigan9 of 83 counties in Zone 1
- Minnesota68 of 87 counties in Zone 1
- Mississippi0 of 82 counties in Zone 1
- Missouri11 of 115 counties in Zone 1
- Montana49 of 56 counties in Zone 1
- Nebraska53 of 93 counties in Zone 1
- Nevada9 of 17 counties in Zone 1
- New Hampshire1 of 10 counties in Zone 1
- New Jersey7 of 21 counties in Zone 1
- New Mexico7 of 33 counties in Zone 1
- New York34 of 62 counties in Zone 1
- North Carolina8 of 100 counties in Zone 1
- North Dakota53 of 53 counties in Zone 1
- Northern Mariana Islands4 counties, no zone on file
- Ohio53 of 88 counties in Zone 1
- Oklahoma0 of 77 counties in Zone 1
- Oregon0 of 36 counties in Zone 1
- Pennsylvania49 of 67 counties in Zone 1
- Puerto Rico78 counties, no zone on file
- Rhode Island2 of 5 counties in Zone 1
- South Carolina1 of 46 counties in Zone 1
- South Dakota48 of 66 counties in Zone 1
- Tennessee39 of 95 counties in Zone 1
- Texas0 of 254 counties in Zone 1
- U.S. Virgin Islands3 counties, no zone on file
- Utah7 of 29 counties in Zone 1
- Vermont0 of 14 counties in Zone 1
- Virginia62 of 133 counties in Zone 1
- Washington7 of 39 counties in Zone 1
- West Virginia20 of 55 counties in Zone 1
- Wisconsin28 of 72 counties in Zone 1
- Wyoming21 of 23 counties in Zone 1
The index
What the index covers
- 56
- States and territories, with real names, FIPS codes and boundaries from Census files
- 3,231
- Counties and county-equivalent areas, each with its own report
- 51 of 56
- State reports with enough data to be submitted for indexing
All 56 states and territories, A to Z, with their counties
- Alabama67 counties
- Alaska29 counties
- American Samoa3 counties
- Arizona15 counties
- Arkansas75 counties
- California58 counties
- Colorado64 counties
- Connecticut8 counties
- Delaware3 counties
- District of Columbia1 county
- Florida67 counties
- Georgia159 counties
- Guam1 county
- Hawaii5 counties
- Idaho44 counties
- Illinois102 counties
- Indiana92 counties
- Iowa99 counties
- Kansas105 counties
- Kentucky120 counties
- Louisiana64 counties
- Maine16 counties
- Maryland24 counties
- Massachusetts14 counties
- Michigan83 counties
- Minnesota87 counties
- Mississippi82 counties
- Missouri115 counties
- Montana56 counties
- Nebraska93 counties
- Nevada17 counties
- New Hampshire10 counties
- New Jersey21 counties
- New Mexico33 counties
- New York62 counties
- North Carolina100 counties
- North Dakota53 counties
- Northern Mariana Islands4 counties
- Ohio88 counties
- Oklahoma77 counties
- Oregon36 counties
- Pennsylvania67 counties
- Puerto Rico78 counties
- Rhode Island5 counties
- South Carolina46 counties
- South Dakota66 counties
- Tennessee95 counties
- Texas254 counties
- U.S. Virgin Islands3 counties
- Utah29 counties
- Vermont14 counties
- Virginia133 counties
- Washington39 counties
- West Virginia55 counties
- Wisconsin72 counties
- Wyoming23 counties