Out of 249 ZIP codes with data in Kentucky, these are mapped to counties in EPA Radon Zone 1. See also: National ZIP Codes in EPA Radon Zone 1 | All Kentucky Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 249 |
| Lowest value | Zone 1 (highest potential) |
| Median value | Zone 1 (highest potential) |
| State | Kentucky |
ZIP Codes in EPA Radon Zone 1
| Rank | ZIP Code | City | State | Radon Zone | Safety Score |
|---|---|---|---|---|---|
| 1 | 40150 | Lebanon Junction | KY | Zone 1 (highest potential) | 49/100 |
| 2 | 40023 | Fisherville | KY | Zone 1 (highest potential) | 50/100 |
| 3 | 40025 | Glenview | KY | Zone 1 (highest potential) | 50/100 |
| 4 | 40041 | Masonic Home | KY | Zone 1 (highest potential) | 50/100 |
| 5 | 40047 | Mount Washington | KY | Zone 1 (highest potential) | 50/100 |
| 6 | 40109 | Brooks | KY | Zone 1 (highest potential) | 50/100 |
| 7 | 40110 | Clermont | KY | Zone 1 (highest potential) | 50/100 |
| 8 | 40118 | Fairdale | KY | Zone 1 (highest potential) | 50/100 |
| 9 | 40165 | Shepherdsville | KY | Zone 1 (highest potential) | 50/100 |
| 10 | 40202 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 11 | 40203 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 12 | 40204 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 13 | 40205 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 14 | 40206 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 15 | 40207 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 16 | 40208 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 17 | 40209 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 18 | 40210 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 19 | 40211 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 20 | 40212 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 21 | 40213 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 22 | 40214 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 23 | 40215 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 24 | 40216 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 25 | 40217 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 26 | 40218 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 27 | 40219 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 28 | 40220 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 29 | 40222 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 30 | 40223 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 31 | 40228 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 32 | 40229 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 33 | 40241 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 34 | 40242 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 35 | 40243 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 36 | 40245 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 37 | 40258 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 38 | 40272 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 39 | 40280 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 40 | 40291 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 41 | 40299 | Louisville | KY | Zone 1 (highest potential) | 50/100 |
| 42 | 42101 | Bowling Green | KY | Zone 1 (highest potential) | 57/100 |
| 43 | 40356 | Nicholasville | KY | Zone 1 (highest potential) | 65/100 |
| 44 | 40390 | Wilmore | KY | Zone 1 (highest potential) | 65/100 |
| 45 | 40510 | Lexington | KY | Zone 1 (highest potential) | 65/100 |
| 46 | 40513 | Lexington | KY | Zone 1 (highest potential) | 65/100 |
| 47 | 40514 | Lexington | KY | Zone 1 (highest potential) | 65/100 |
| 48 | 42544 | Nancy | KY | Zone 1 (highest potential) | 65/100 |
| 49 | 42501 | Somerset | KY | Zone 1 (highest potential) | 66/100 |
| 50 | 42503 | Somerset | KY | Zone 1 (highest potential) | 66/100 |
| 51 | 42519 | Burnside | KY | Zone 1 (highest potential) | 66/100 |
| 52 | 42553 | Science Hill | KY | Zone 1 (highest potential) | 66/100 |
| 53 | 42567 | Eubank | KY | Zone 1 (highest potential) | 66/100 |
| 54 | 40502 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 55 | 40503 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 56 | 40504 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 57 | 40505 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 58 | 40507 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 59 | 40508 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 60 | 40509 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 61 | 40511 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 62 | 40515 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 63 | 40517 | Lexington | KY | Zone 1 (highest potential) | 67/100 |
| 64 | 42103 | Bowling Green | KY | Zone 1 (highest potential) | 67/100 |
| 65 | 42104 | Bowling Green | KY | Zone 1 (highest potential) | 67/100 |
| 66 | 40004 | Bardstown | KY | Zone 1 (highest potential) | — |
| 67 | 40008 | Bloomfield | KY | Zone 1 (highest potential) | — |
| 68 | 40009 | Bradfordsville | KY | Zone 1 (highest potential) | — |
| 69 | 40012 | Chaplin | KY | Zone 1 (highest potential) | — |
| 70 | 40020 | Fairfield | KY | Zone 1 (highest potential) | — |
| 71 | 40033 | Lebanon | KY | Zone 1 (highest potential) | — |
| 72 | 40037 | Loretto | KY | Zone 1 (highest potential) | — |
| 73 | 40049 | Nerinx | KY | Zone 1 (highest potential) | — |
| 74 | 40060 | Raywick | KY | Zone 1 (highest potential) | — |
| 75 | 40062 | Saint Francis | KY | Zone 1 (highest potential) | — |
| 76 | 40063 | Saint Mary | KY | Zone 1 (highest potential) | — |
| 77 | 40107 | Boston | KY | Zone 1 (highest potential) | — |
Methodology
This ranking is limited to EPA county-level radon zone classification. Zone 1 is an EPA county-level radon-potential category; it does not measure a home or establish whether any building is above an action level. Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to organize area context.
Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-10-15.
Frequently Asked Questions
What is EPA Radon Zone 1?
Zone 1 is an EPA county-level radon-potential category. It is not a measurement for a home and cannot determine whether a building is above an action level. A home test is required for that decision.
Should I test for radon?
The EPA recommends testing all homes regardless of radon zone. A DIY test kit costs $15-40. Professional testing costs $150-250. If levels exceed 4 pCi/L, mitigation systems ($800-2,500) can reduce radon by up to 99%.
Explore More Rankings
- Worst ZIP Codes for Lead in Water in Kentucky
- ZIP Codes with Most EPA Violations in Kentucky
- Lowest Home Safety Scores in Kentucky
- Highest Home Safety Scores in Kentucky
- Historical NFIP Claim Counts in Kentucky
- ZIP Codes with Highest Energy Costs in Kentucky
- ZIP Codes with PFAS Detections in Kentucky
- Least Reliable Water Systems in Kentucky
- Environmental Justice Concern Areas in Kentucky
- Worst ZIP Codes for Homebuyers in Kentucky
- ZIP Codes with Worst CO & Gas Risk in Kentucky
- Safest ZIP Codes for Gas & CO Risk in Kentucky
- ZIP Codes with Worst Wildfire Smoke Risk in Kentucky
- Safest ZIP Codes for Wildfire Smoke in Kentucky
- All Rankings