Highest Radon Risk ZIP Codes in Kentucky — 2026

Out of 249 ZIP codes with data in Kentucky, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Kentucky Rankings

Statistic	Value
ZIP codes ranked	249
Lowest value	Zone 1 (High)
Median value	Zone 1 (High)
State	Kentucky

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Radon Zone	Safety Score
1	40059	Prospect	KY	Zone 1 (High)	30/100
2	42713	Bonnieville	KY	Zone 1 (High)	31/100
3	40118	Fairdale	KY	Zone 1 (High)	35/100
4	40165	Shepherdsville	KY	Zone 1 (High)	35/100
5	40020	Fairfield	KY	Zone 1 (High)	40/100
6	40027	Harrods Creek	KY	Zone 1 (High)	40/100
7	40037	Loretto	KY	Zone 1 (High)	40/100
8	40041	Masonic Home	KY	Zone 1 (High)	40/100
9	40048	Nazareth	KY	Zone 1 (High)	40/100
10	40049	Nerinx	KY	Zone 1 (High)	40/100
11	40060	Raywick	KY	Zone 1 (High)	40/100
12	40062	Saint Francis	KY	Zone 1 (High)	40/100
13	40063	Saint Mary	KY	Zone 1 (High)	40/100
14	40107	Boston	KY	Zone 1 (High)	40/100
15	40109	Brooks	KY	Zone 1 (High)	40/100
16	40110	Clermont	KY	Zone 1 (High)	40/100
17	40129	Hillview	KY	Zone 1 (High)	40/100
18	40166	Shepherdsville	KY	Zone 1 (High)	40/100
19	40339	Keene	KY	Zone 1 (High)	40/100
20	40357	North Middletown	KY	Zone 1 (High)	40/100
21	40440	Junction City	KY	Zone 1 (High)	40/100
22	40442	Kings Mountain	KY	Zone 1 (High)	40/100
23	40448	Mc Kinney	KY	Zone 1 (High)	40/100
24	40452	Mitchellsburg	KY	Zone 1 (High)	40/100
25	41053	Kenton	KY	Zone 1 (High)	40/100
26	42123	Austin	KY	Zone 1 (High)	40/100
27	42124	Beaumont	KY	Zone 1 (High)	40/100
28	42130	Eighty Eight	KY	Zone 1 (High)	40/100
29	42131	Etoile	KY	Zone 1 (High)	40/100
30	42140	Gamaliel	KY	Zone 1 (High)	40/100
31	42151	Hestand	KY	Zone 1 (High)	40/100
32	42152	Hiseville	KY	Zone 1 (High)	40/100
33	42153	Holland	KY	Zone 1 (High)	40/100
34	42154	Knob Lick	KY	Zone 1 (High)	40/100
35	42156	Lucas	KY	Zone 1 (High)	40/100
36	42157	Mount Hermon	KY	Zone 1 (High)	40/100
37	42160	Park City	KY	Zone 1 (High)	40/100
38	42163	Rocky Hill	KY	Zone 1 (High)	40/100
39	42166	Summer Shade	KY	Zone 1 (High)	40/100
40	42214	Center	KY	Zone 1 (High)	40/100
41	42516	Bethelridge	KY	Zone 1 (High)	40/100
42	42528	Dunnville	KY	Zone 1 (High)	40/100
43	42533	Ferguson	KY	Zone 1 (High)	40/100
44	42541	Middleburg	KY	Zone 1 (High)	40/100
45	42558	Tateville	KY	Zone 1 (High)	40/100
46	42564	West Somerset	KY	Zone 1 (High)	40/100
47	42565	Windsor	KY	Zone 1 (High)	40/100
48	42566	Yosemite	KY	Zone 1 (High)	40/100
49	42715	Breeding	KY	Zone 1 (High)	40/100
50	42720	Cane Valley	KY	Zone 1 (High)	40/100
51	42722	Canmer	KY	Zone 1 (High)	40/100
52	42729	Cub Run	KY	Zone 1 (High)	40/100
53	42733	Elk Horn	KY	Zone 1 (High)	40/100
54	42741	Glens Fork	KY	Zone 1 (High)	40/100
55	42742	Gradyville	KY	Zone 1 (High)	40/100
56	42746	Hardyville	KY	Zone 1 (High)	40/100
57	42753	Knifley	KY	Zone 1 (High)	40/100
58	42758	Mannsville	KY	Zone 1 (High)	40/100
59	42776	Sonora	KY	Zone 1 (High)	40/100
60	42782	Summersville	KY	Zone 1 (High)	40/100
61	41007	California	KY	Zone 1 (High)	45/100
62	40356	Nicholasville	KY	Zone 1 (High)	47/100
63	40383	Versailles	KY	Zone 1 (High)	47/100
64	40601	Frankfort	KY	Zone 1 (High)	48/100
65	40340	Nicholasville	KY	Zone 1 (High)	50/100
66	40503	Lexington	KY	Zone 1 (High)	50/100
67	40504	Lexington	KY	Zone 1 (High)	50/100
68	40515	Lexington	KY	Zone 1 (High)	50/100
69	40150	Lebanon Junction	KY	Zone 1 (High)	52/100
70	40361	Paris	KY	Zone 1 (High)	52/100
71	40009	Bradfordsville	KY	Zone 1 (High)	53/100
72	40012	Chaplin	KY	Zone 1 (High)	53/100
73	40018	Eastwood	KY	Zone 1 (High)	53/100
74	40023	Fisherville	KY	Zone 1 (High)	53/100
75	40025	Glenview	KY	Zone 1 (High)	53/100
76	40046	Mount Eden	KY	Zone 1 (High)	53/100
77	40047	Mount Washington	KY	Zone 1 (High)	53/100
78	40056	Pewee Valley	KY	Zone 1 (High)	53/100
79	40328	Gravel Switch	KY	Zone 1 (High)	53/100
80	40379	Stamping Ground	KY	Zone 1 (High)	53/100
81	40468	Perryville	KY	Zone 1 (High)	53/100
82	40489	Waynesburg	KY	Zone 1 (High)	53/100
83	40506	Lexington	KY	Zone 1 (High)	53/100
84	40512	Lexington	KY	Zone 1 (High)	53/100
85	40522	Lexington	KY	Zone 1 (High)	53/100
86	40523	Lexington	KY	Zone 1 (High)	53/100
87	40526	Lexington	KY	Zone 1 (High)	53/100
88	40533	Lexington	KY	Zone 1 (High)	53/100
89	40536	Lexington	KY	Zone 1 (High)	53/100
90	40544	Lexington	KY	Zone 1 (High)	53/100
91	40546	Lexington	KY	Zone 1 (High)	53/100
92	40550	Lexington	KY	Zone 1 (High)	53/100
93	40555	Lexington	KY	Zone 1 (High)	53/100
94	40575	Lexington	KY	Zone 1 (High)	53/100
95	40576	Lexington	KY	Zone 1 (High)	53/100
96	40577	Lexington	KY	Zone 1 (High)	53/100
97	40578	Lexington	KY	Zone 1 (High)	53/100
98	40579	Lexington	KY	Zone 1 (High)	53/100
99	40580	Lexington	KY	Zone 1 (High)	53/100
100	40581	Lexington	KY	Zone 1 (High)	53/100

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%.