Highest Radon Risk ZIP Codes in Wyoming — 2026

Out of 185 ZIP codes with data in Wyoming, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Wyoming Rankings

Statistic	Value
ZIP codes ranked	185
Lowest value	Zone 1 (High)
Median value	Zone 1 (High)
State	Wyoming

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Radon Zone	Safety Score
1	82222	Lance Creek	WY	Zone 1 (High)	13/100
2	82321	Baggs	WY	Zone 1 (High)	30/100
3	82002	Cheyenne	WY	Zone 1 (High)	32/100
4	82006	Cheyenne	WY	Zone 1 (High)	32/100
5	82008	Cheyenne	WY	Zone 1 (High)	32/100
6	82010	Cheyenne	WY	Zone 1 (High)	32/100
7	82329	Medicine Bow	WY	Zone 1 (High)	32/100
8	82001	Cheyenne	WY	Zone 1 (High)	34/100
9	82009	Cheyenne	WY	Zone 1 (High)	34/100
10	83101	Kemmerer	WY	Zone 1 (High)	36/100
11	82007	Cheyenne	WY	Zone 1 (High)	39/100
12	82005	Fe Warren Afb	WY	Zone 1 (High)	40/100
13	82051	Bosler	WY	Zone 1 (High)	40/100
14	82052	Buford	WY	Zone 1 (High)	40/100
15	82058	Garrett	WY	Zone 1 (High)	40/100
16	82059	Granite Canon	WY	Zone 1 (High)	40/100
17	82060	Hillsdale	WY	Zone 1 (High)	40/100
18	82061	Horse Creek	WY	Zone 1 (High)	40/100
19	82063	Jelm	WY	Zone 1 (High)	40/100
20	82081	Meriden	WY	Zone 1 (High)	40/100
21	82084	Tie Siding	WY	Zone 1 (High)	40/100
22	82217	Hawk Springs	WY	Zone 1 (High)	40/100
23	82218	Huntley	WY	Zone 1 (High)	40/100
24	82221	Lagrange	WY	Zone 1 (High)	40/100
25	82224	Lost Springs	WY	Zone 1 (High)	40/100
26	82229	Shawnee	WY	Zone 1 (High)	40/100
27	82242	Van Tassell	WY	Zone 1 (High)	40/100
28	82243	Veteran	WY	Zone 1 (High)	40/100
29	82332	Savery	WY	Zone 1 (High)	40/100
30	82335	Walcott	WY	Zone 1 (High)	40/100
31	82422	Emblem	WY	Zone 1 (High)	40/100
32	82434	Otto	WY	Zone 1 (High)	40/100
33	82440	Ralston	WY	Zone 1 (High)	40/100
34	82510	Arapahoe	WY	Zone 1 (High)	40/100
35	82512	Crowheart	WY	Zone 1 (High)	40/100
36	82514	Fort Washakie	WY	Zone 1 (High)	40/100
37	82516	Kinnear	WY	Zone 1 (High)	40/100
38	82524	Saint Stephens	WY	Zone 1 (High)	40/100
39	82615	Shirley Basin	WY	Zone 1 (High)	40/100
40	82620	Alcova	WY	Zone 1 (High)	40/100
41	82630	Arminto	WY	Zone 1 (High)	40/100
42	82638	Hiland	WY	Zone 1 (High)	40/100
43	82640	Linch	WY	Zone 1 (High)	40/100
44	82642	Lysite	WY	Zone 1 (High)	40/100
45	82646	Natrona	WY	Zone 1 (High)	40/100
46	82648	Powder River	WY	Zone 1 (High)	40/100
47	82710	Aladdin	WY	Zone 1 (High)	40/100
48	82711	Alva	WY	Zone 1 (High)	40/100
49	82714	Devils Tower	WY	Zone 1 (High)	40/100
50	82725	Recluse	WY	Zone 1 (High)	40/100
51	82731	Weston	WY	Zone 1 (High)	40/100
52	82831	Arvada	WY	Zone 1 (High)	40/100
53	82837	Leiter	WY	Zone 1 (High)	40/100
54	82838	Parkman	WY	Zone 1 (High)	40/100
55	82840	Saddlestring	WY	Zone 1 (High)	40/100
56	82844	Wolf	WY	Zone 1 (High)	40/100
57	82845	Wyarno	WY	Zone 1 (High)	40/100
58	82923	Boulder	WY	Zone 1 (High)	40/100
59	82925	Cora	WY	Zone 1 (High)	40/100
60	82936	Lonetree	WY	Zone 1 (High)	40/100
61	82938	Mc Kinnon	WY	Zone 1 (High)	40/100
62	82943	Reliance	WY	Zone 1 (High)	40/100
63	82944	Robertson	WY	Zone 1 (High)	40/100
64	83011	Kelly	WY	Zone 1 (High)	40/100
65	83115	Daniel	WY	Zone 1 (High)	40/100
66	83116	Diamondville	WY	Zone 1 (High)	40/100
67	83121	Frontier	WY	Zone 1 (High)	40/100
68	82801	Sheridan	WY	Zone 1 (High)	43/100
69	82003	Cheyenne	WY	Zone 1 (High)	44/100
70	82712	Beulah	WY	Zone 1 (High)	45/100
71	82050	Albin	WY	Zone 1 (High)	49/100
72	82432	Manderson	WY	Zone 1 (High)	49/100
73	82323	Dixon	WY	Zone 1 (High)	50/100
74	82450	Wapiti	WY	Zone 1 (High)	53/100
75	82832	Banner	WY	Zone 1 (High)	53/100
76	82833	Big Horn	WY	Zone 1 (High)	53/100
77	82842	Story	WY	Zone 1 (High)	53/100
78	82922	Bondurant	WY	Zone 1 (High)	53/100
79	82933	Fort Bridger	WY	Zone 1 (High)	53/100
80	82501	Riverton	WY	Zone 1 (High)	54/100
81	82523	Pavillion	WY	Zone 1 (High)	54/100
82	82240	Torrington	WY	Zone 1 (High)	56/100
83	82945	Superior	WY	Zone 1 (High)	56/100
84	83119	Fairview	WY	Zone 1 (High)	56/100
85	82431	Lovell	WY	Zone 1 (High)	57/100
86	83128	Alpine	WY	Zone 1 (High)	58/100
87	82934	Granger	WY	Zone 1 (High)	59/100
88	82836	Dayton	WY	Zone 1 (High)	60/100
89	83122	Grover	WY	Zone 1 (High)	60/100
90	83123	La Barge	WY	Zone 1 (High)	60/100
91	82082	Pine Bluffs	WY	Zone 1 (High)	61/100
92	82433	Meeteetse	WY	Zone 1 (High)	61/100
93	82716	Gillette	WY	Zone 1 (High)	61/100
94	82721	Moorcroft	WY	Zone 1 (High)	61/100
95	82942	Point Of Rocks	WY	Zone 1 (High)	61/100
96	83111	Auburn	WY	Zone 1 (High)	61/100
97	83113	Big Piney	WY	Zone 1 (High)	61/100
98	82301	Rawlins	WY	Zone 1 (High)	62/100
99	82601	Casper	WY	Zone 1 (High)	62/100
100	82604	Casper	WY	Zone 1 (High)	62/100

Methodology

Radon rankings are based on EPA county-level radon zone classifications. Zone 1 (highest risk) has predicted average indoor radon levels above 4 pCi/L — the EPA action level. Zone 2 is moderate (2-4 pCi/L) and Zone 3 is low (below 2 pCi/L). Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to prioritize areas with compounding risk factors.

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: 2026-06-04.

Frequently Asked Questions

What is EPA Radon Zone 1?

Zone 1 is the EPA highest-risk classification, meaning the county has predicted average indoor radon levels above 4 pCi/L — the level at which the EPA recommends mitigation. Radon causes about 21,000 lung cancer deaths per year in the U.S.

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%.