Out of 185 ZIP codes with data in Wyoming, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes in EPA Radon Zone 1 | All Wyoming Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 185 |
| Lowest value | Zone 1 (highest potential) |
| Median value | Zone 1 (highest potential) |
| State | Wyoming |
100 Lowest-Ranked ZIP Codes
| Rank | ZIP Code | City | State | Radon Zone | Safety Score |
|---|---|---|---|---|---|
| 1 | 82501 | Riverton | WY | Zone 1 (highest potential) | 36/100 |
| 2 | 82520 | Lander | WY | Zone 1 (highest potential) | 49/100 |
| 3 | 82301 | Rawlins | WY | Zone 1 (highest potential) | 53/100 |
| 4 | 83101 | Kemmerer | WY | Zone 1 (highest potential) | 60/100 |
| 5 | 83116 | Diamondville | WY | Zone 1 (highest potential) | 60/100 |
| 6 | 82834 | Buffalo | WY | Zone 1 (highest potential) | 62/100 |
| 7 | 82001 | Cheyenne | WY | Zone 1 (highest potential) | 63/100 |
| 8 | 82604 | Casper | WY | Zone 1 (highest potential) | 63/100 |
| 9 | 83001 | Jackson | WY | Zone 1 (highest potential) | 63/100 |
| 10 | 82601 | Casper | WY | Zone 1 (highest potential) | 64/100 |
| 11 | 82716 | Gillette | WY | Zone 1 (highest potential) | 64/100 |
| 12 | 82005 | Fe Warren Afb | WY | Zone 1 (highest potential) | 65/100 |
| 13 | 82009 | Cheyenne | WY | Zone 1 (highest potential) | 65/100 |
| 14 | 82644 | Mills | WY | Zone 1 (highest potential) | 65/100 |
| 15 | 82007 | Cheyenne | WY | Zone 1 (highest potential) | 66/100 |
| 16 | 82070 | Laramie | WY | Zone 1 (highest potential) | 66/100 |
| 17 | 82072 | Laramie | WY | Zone 1 (highest potential) | 66/100 |
| 18 | 82414 | Cody | WY | Zone 1 (highest potential) | 66/100 |
| 19 | 82609 | Casper | WY | Zone 1 (highest potential) | 66/100 |
| 20 | 82718 | Gillette | WY | Zone 1 (highest potential) | 66/100 |
| 21 | 82727 | Rozet | WY | Zone 1 (highest potential) | 66/100 |
| 22 | 82901 | Rock Springs | WY | Zone 1 (highest potential) | 66/100 |
| 23 | 82930 | Evanston | WY | Zone 1 (highest potential) | 66/100 |
| 24 | 82935 | Green River | WY | Zone 1 (highest potential) | 66/100 |
| 25 | 82401 | Worland | WY | Zone 1 (highest potential) | 67/100 |
| 26 | 82435 | Powell | WY | Zone 1 (highest potential) | 67/100 |
| 27 | 82633 | Douglas | WY | Zone 1 (highest potential) | 67/100 |
| 28 | 82801 | Sheridan | WY | Zone 1 (highest potential) | 67/100 |
| 29 | 82943 | Reliance | WY | Zone 1 (highest potential) | 67/100 |
| 30 | 82002 | Cheyenne | WY | Zone 1 (highest potential) | — |
| 31 | 82003 | Cheyenne | WY | Zone 1 (highest potential) | — |
| 32 | 82006 | Cheyenne | WY | Zone 1 (highest potential) | — |
| 33 | 82008 | Cheyenne | WY | Zone 1 (highest potential) | — |
| 34 | 82010 | Cheyenne | WY | Zone 1 (highest potential) | — |
| 35 | 82050 | Albin | WY | Zone 1 (highest potential) | — |
| 36 | 82051 | Bosler | WY | Zone 1 (highest potential) | — |
| 37 | 82052 | Buford | WY | Zone 1 (highest potential) | — |
| 38 | 82053 | Burns | WY | Zone 1 (highest potential) | — |
| 39 | 82054 | Carpenter | WY | Zone 1 (highest potential) | — |
| 40 | 82055 | Centennial | WY | Zone 1 (highest potential) | — |
| 41 | 82058 | Garrett | WY | Zone 1 (highest potential) | — |
| 42 | 82059 | Granite Canon | WY | Zone 1 (highest potential) | — |
| 43 | 82060 | Hillsdale | WY | Zone 1 (highest potential) | — |
| 44 | 82061 | Horse Creek | WY | Zone 1 (highest potential) | — |
| 45 | 82063 | Jelm | WY | Zone 1 (highest potential) | — |
| 46 | 82071 | Laramie | WY | Zone 1 (highest potential) | — |
| 47 | 82073 | Laramie | WY | Zone 1 (highest potential) | — |
| 48 | 82081 | Meriden | WY | Zone 1 (highest potential) | — |
| 49 | 82082 | Pine Bluffs | WY | Zone 1 (highest potential) | — |
| 50 | 82083 | Rock River | WY | Zone 1 (highest potential) | — |
| 51 | 82084 | Tie Siding | WY | Zone 1 (highest potential) | — |
| 52 | 82190 | Yellowstone National Park | WY | Zone 1 (highest potential) | — |
| 53 | 82212 | Fort Laramie | WY | Zone 1 (highest potential) | — |
| 54 | 82217 | Hawk Springs | WY | Zone 1 (highest potential) | — |
| 55 | 82218 | Huntley | WY | Zone 1 (highest potential) | — |
| 56 | 82221 | Lagrange | WY | Zone 1 (highest potential) | — |
| 57 | 82222 | Lance Creek | WY | Zone 1 (highest potential) | — |
| 58 | 82223 | Lingle | WY | Zone 1 (highest potential) | — |
| 59 | 82224 | Lost Springs | WY | Zone 1 (highest potential) | — |
| 60 | 82225 | Lusk | WY | Zone 1 (highest potential) | — |
| 61 | 82227 | Manville | WY | Zone 1 (highest potential) | — |
| 62 | 82229 | Shawnee | WY | Zone 1 (highest potential) | — |
| 63 | 82240 | Torrington | WY | Zone 1 (highest potential) | — |
| 64 | 82242 | Van Tassell | WY | Zone 1 (highest potential) | — |
| 65 | 82243 | Veteran | WY | Zone 1 (highest potential) | — |
| 66 | 82244 | Yoder | WY | Zone 1 (highest potential) | — |
| 67 | 82310 | Jeffrey City | WY | Zone 1 (highest potential) | — |
| 68 | 82321 | Baggs | WY | Zone 1 (highest potential) | — |
| 69 | 82322 | Bairoil | WY | Zone 1 (highest potential) | — |
| 70 | 82323 | Dixon | WY | Zone 1 (highest potential) | — |
| 71 | 82324 | Elk Mountain | WY | Zone 1 (highest potential) | — |
| 72 | 82325 | Encampment | WY | Zone 1 (highest potential) | — |
| 73 | 82327 | Hanna | WY | Zone 1 (highest potential) | — |
| 74 | 82329 | Medicine Bow | WY | Zone 1 (highest potential) | — |
| 75 | 82331 | Saratoga | WY | Zone 1 (highest potential) | — |
| 76 | 82332 | Savery | WY | Zone 1 (highest potential) | — |
| 77 | 82334 | Sinclair | WY | Zone 1 (highest potential) | — |
| 78 | 82335 | Walcott | WY | Zone 1 (highest potential) | — |
| 79 | 82336 | Wamsutter | WY | Zone 1 (highest potential) | — |
| 80 | 82410 | Basin | WY | Zone 1 (highest potential) | — |
| 81 | 82411 | Burlington | WY | Zone 1 (highest potential) | — |
| 82 | 82412 | Byron | WY | Zone 1 (highest potential) | — |
| 83 | 82420 | Cowley | WY | Zone 1 (highest potential) | — |
| 84 | 82421 | Deaver | WY | Zone 1 (highest potential) | — |
| 85 | 82422 | Emblem | WY | Zone 1 (highest potential) | — |
| 86 | 82423 | Frannie | WY | Zone 1 (highest potential) | — |
| 87 | 82426 | Greybull | WY | Zone 1 (highest potential) | — |
| 88 | 82428 | Hyattville | WY | Zone 1 (highest potential) | — |
| 89 | 82430 | Kirby | WY | Zone 1 (highest potential) | — |
| 90 | 82431 | Lovell | WY | Zone 1 (highest potential) | — |
| 91 | 82432 | Manderson | WY | Zone 1 (highest potential) | — |
| 92 | 82433 | Meeteetse | WY | Zone 1 (highest potential) | — |
| 93 | 82434 | Otto | WY | Zone 1 (highest potential) | — |
| 94 | 82440 | Ralston | WY | Zone 1 (highest potential) | — |
| 95 | 82441 | Shell | WY | Zone 1 (highest potential) | — |
| 96 | 82442 | Ten Sleep | WY | Zone 1 (highest potential) | — |
| 97 | 82443 | Thermopolis | WY | Zone 1 (highest potential) | — |
| 98 | 82450 | Wapiti | WY | Zone 1 (highest potential) | — |
| 99 | 82510 | Arapahoe | WY | Zone 1 (highest potential) | — |
| 100 | 82512 | Crowheart | WY | Zone 1 (highest potential) | — |
Methodology
This ranking is limited to EPA county-level radon zone classification. Zone 1 identifies the highest county-level 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: 2026-08-31.
Frequently Asked Questions
What is EPA Radon Zone 1?
Zone 1 is the EPA highest 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%.
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