Highest Radon Risk ZIP Codes in Indiana — 2026

Out of 635 ZIP codes with data in Indiana, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Indiana Rankings

Statistic	Value
ZIP codes ranked	635
Lowest value	Zone 1 (High)
Median value	Zone 1 (High)
State	Indiana

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Radon Zone	Safety Score
1	46538	Leesburg	IN	Zone 1 (High)	24/100
2	46741	Grabill	IN	Zone 1 (High)	31/100
3	46974	Roann	IN	Zone 1 (High)	31/100
4	47355	Lynn	IN	Zone 1 (High)	33/100
5	47952	Kingman	IN	Zone 1 (High)	33/100
6	47150	New Albany	IN	Zone 1 (High)	35/100
7	47451	Oolitic	IN	Zone 1 (High)	36/100
8	46725	Columbia City	IN	Zone 1 (High)	38/100
9	46733	Decatur	IN	Zone 1 (High)	39/100
10	46039	Forest	IN	Zone 1 (High)	40/100
11	46045	Goldsmith	IN	Zone 1 (High)	40/100
12	46047	Hobbs	IN	Zone 1 (High)	40/100
13	46049	Kempton	IN	Zone 1 (High)	40/100
14	46067	Sedalia	IN	Zone 1 (High)	40/100
15	46103	Amo	IN	Zone 1 (High)	40/100
16	46117	Charlottesville	IN	Zone 1 (High)	40/100
17	46127	Falmouth	IN	Zone 1 (High)	40/100
18	46129	Finly	IN	Zone 1 (High)	40/100
19	46144	Gwynneville	IN	Zone 1 (High)	40/100
20	46146	Homer	IN	Zone 1 (High)	40/100
21	46154	Maxwell	IN	Zone 1 (High)	40/100
22	46155	Mays	IN	Zone 1 (High)	40/100
23	46170	Putnamville	IN	Zone 1 (High)	40/100
24	46180	Stilesville	IN	Zone 1 (High)	40/100
25	46186	Wilkinson	IN	Zone 1 (High)	40/100
26	46365	Mill Creek	IN	Zone 1 (High)	40/100
27	46382	Union Mills	IN	Zone 1 (High)	40/100
28	46502	Atwood	IN	Zone 1 (High)	40/100
29	46508	Burket	IN	Zone 1 (High)	40/100
30	46531	Grovertown	IN	Zone 1 (High)	40/100
31	46572	Tyner	IN	Zone 1 (High)	40/100
32	46595	Wyatt	IN	Zone 1 (High)	40/100
33	46704	Arcola	IN	Zone 1 (High)	40/100
34	46713	Bippus	IN	Zone 1 (High)	40/100
35	46731	Craigville	IN	Zone 1 (High)	40/100
36	46764	Larwill	IN	Zone 1 (High)	40/100
37	46769	Linn Grove	IN	Zone 1 (High)	40/100
38	46771	Mongo	IN	Zone 1 (High)	40/100
39	46778	Petroleum	IN	Zone 1 (High)	40/100
40	46780	Pleasant Mills	IN	Zone 1 (High)	40/100
41	46781	Poneto	IN	Zone 1 (High)	40/100
42	46786	South Milford	IN	Zone 1 (High)	40/100
43	46789	Stroh	IN	Zone 1 (High)	40/100
44	46791	Uniondale	IN	Zone 1 (High)	40/100
45	46794	Wawaka	IN	Zone 1 (High)	40/100
46	46798	Yoder	IN	Zone 1 (High)	40/100
47	46912	Athens	IN	Zone 1 (High)	40/100
48	46913	Bringhurst	IN	Zone 1 (High)	40/100
49	46916	Burrows	IN	Zone 1 (High)	40/100
50	46921	Deedsville	IN	Zone 1 (High)	40/100
51	46930	Fowlerton	IN	Zone 1 (High)	40/100
52	46931	Fulton	IN	Zone 1 (High)	40/100
53	46935	Grass Creek	IN	Zone 1 (High)	40/100
54	46942	Lake Cicott	IN	Zone 1 (High)	40/100
55	46943	Laketon	IN	Zone 1 (High)	40/100
56	46946	Liberty Mills	IN	Zone 1 (High)	40/100
57	46950	Lucerne	IN	Zone 1 (High)	40/100
58	46958	Mexico	IN	Zone 1 (High)	40/100
59	46959	Miami	IN	Zone 1 (High)	40/100
60	46961	New Waverly	IN	Zone 1 (High)	40/100
61	46967	Onward	IN	Zone 1 (High)	40/100
62	46968	Ora	IN	Zone 1 (High)	40/100
63	46971	Grissom Arb	IN	Zone 1 (High)	40/100
64	46977	Rockfield	IN	Zone 1 (High)	40/100
65	46980	Servia	IN	Zone 1 (High)	40/100
66	46987	Sweetser	IN	Zone 1 (High)	40/100
67	46990	Urbana	IN	Zone 1 (High)	40/100
68	46995	West Middleton	IN	Zone 1 (High)	40/100
69	46998	Young America	IN	Zone 1 (High)	40/100
70	47010	Bath	IN	Zone 1 (High)	40/100
71	47104	Bethlehem	IN	Zone 1 (High)	40/100
72	47110	Central	IN	Zone 1 (High)	40/100
73	47129	Clarksville	IN	Zone 1 (High)	40/100
74	47147	Nabb	IN	Zone 1 (High)	40/100
75	47151	New Albany	IN	Zone 1 (High)	40/100
76	47160	New Middletown	IN	Zone 1 (High)	40/100
77	47177	Underwood	IN	Zone 1 (High)	40/100
78	47226	Clifford	IN	Zone 1 (High)	40/100
79	47230	Deputy	IN	Zone 1 (High)	40/100
80	47236	Grammer	IN	Zone 1 (High)	40/100
81	47244	Hartsville	IN	Zone 1 (High)	40/100
82	47245	Hayden	IN	Zone 1 (High)	40/100
83	47261	Millhousen	IN	Zone 1 (High)	40/100
84	47270	Paris Crossing	IN	Zone 1 (High)	40/100
85	47322	Bentonville	IN	Zone 1 (High)	40/100
86	47324	Boston	IN	Zone 1 (High)	40/100
87	47325	Brownsville	IN	Zone 1 (High)	40/100
88	47337	Dunreith	IN	Zone 1 (High)	40/100
89	47339	Economy	IN	Zone 1 (High)	40/100
90	47344	Greensboro	IN	Zone 1 (High)	40/100
91	47351	Kennard	IN	Zone 1 (High)	40/100
92	47366	New Lisbon	IN	Zone 1 (High)	40/100
93	47367	Oakville	IN	Zone 1 (High)	40/100
94	47370	Pershing	IN	Zone 1 (High)	40/100
95	47381	Salamonia	IN	Zone 1 (High)	40/100
96	47382	Saratoga	IN	Zone 1 (High)	40/100
97	47387	Straughn	IN	Zone 1 (High)	40/100
98	47388	Sulphur Springs	IN	Zone 1 (High)	40/100
99	47392	Webster	IN	Zone 1 (High)	40/100
100	47420	Avoca	IN	Zone 1 (High)	40/100

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%.