Highest Radon Risk ZIP Codes in Missouri — 2026

Out of 201 ZIP codes with data in Missouri, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Missouri Rankings

Statistic	Value
ZIP codes ranked	201
Lowest value	Zone 1 (High)
Median value	Zone 1 (High)
State	Missouri

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Radon Zone	Safety Score
1	63011	Ballwin	MO	Zone 1 (High)	40/100
2	63021	Ballwin	MO	Zone 1 (High)	40/100
3	63022	Ballwin	MO	Zone 1 (High)	40/100
4	63024	Ballwin	MO	Zone 1 (High)	40/100
5	63045	Earth City	MO	Zone 1 (High)	40/100
6	63675	Vulcan	MO	Zone 1 (High)	40/100
7	64070	Lone Jack	MO	Zone 1 (High)	40/100
8	64432	Clyde	MO	Zone 1 (High)	40/100
9	64440	De Kalb	MO	Zone 1 (High)	40/100
10	64448	Faucett	MO	Zone 1 (High)	40/100
11	64476	Pickering	MO	Zone 1 (High)	40/100
12	64480	Rea	MO	Zone 1 (High)	40/100
13	64493	Turney	MO	Zone 1 (High)	40/100
14	64504	Saint Joseph	MO	Zone 1 (High)	40/100
15	64505	Saint Joseph	MO	Zone 1 (High)	40/100
16	64508	Saint Joseph	MO	Zone 1 (High)	40/100
17	64864	Saginaw	MO	Zone 1 (High)	40/100
18	65439	Bixby	MO	Zone 1 (High)	40/100
19	65440	Boss	MO	Zone 1 (High)	40/100
20	63038	Glencoe	MO	Zone 1 (High)	45/100
21	64073	Mosby	MO	Zone 1 (High)	45/100
22	64401	Agency	MO	Zone 1 (High)	45/100
23	64501	Saint Joseph	MO	Zone 1 (High)	45/100
24	64503	Saint Joseph	MO	Zone 1 (High)	45/100
25	64506	Saint Joseph	MO	Zone 1 (High)	45/100
26	64507	Saint Joseph	MO	Zone 1 (High)	45/100
27	64427	Bolckow	MO	Zone 1 (High)	47/100
28	63650	Ironton	MO	Zone 1 (High)	48/100
29	64437	Craig	MO	Zone 1 (High)	48/100
30	63636	Des Arc	MO	Zone 1 (High)	53/100
31	64028	Farley	MO	Zone 1 (High)	53/100
32	64074	Napoleon	MO	Zone 1 (High)	53/100
33	64433	Conception	MO	Zone 1 (High)	53/100
34	64434	Conception Junction	MO	Zone 1 (High)	53/100
35	64457	Guilford	MO	Zone 1 (High)	53/100
36	64502	Saint Joseph	MO	Zone 1 (High)	53/100
37	65456	Davisville	MO	Zone 1 (High)	53/100
38	64130	Kansas City	MO	Zone 1 (High)	55/100
39	64466	Maitland	MO	Zone 1 (High)	55/100
40	64484	Rushville	MO	Zone 1 (High)	55/100
41	64746	Freeman	MO	Zone 1 (High)	55/100
42	64089	Smithville	MO	Zone 1 (High)	56/100
43	64075	Oak Grove	MO	Zone 1 (High)	57/100
44	64491	Tarkio	MO	Zone 1 (High)	57/100
45	64734	Cleveland	MO	Zone 1 (High)	57/100
46	64078	Peculiar	MO	Zone 1 (High)	58/100
47	64150	Riverside	MO	Zone 1 (High)	58/100
48	64421	Amazonia	MO	Zone 1 (High)	58/100
49	64080	Pleasant Hill	MO	Zone 1 (High)	59/100
50	64024	Excelsior Springs	MO	Zone 1 (High)	60/100
51	64052	Independence	MO	Zone 1 (High)	60/100
52	64108	Kansas City	MO	Zone 1 (High)	60/100
53	64112	Kansas City	MO	Zone 1 (High)	60/100
54	64114	Kansas City	MO	Zone 1 (High)	60/100
55	64117	Kansas City	MO	Zone 1 (High)	60/100
56	64118	Kansas City	MO	Zone 1 (High)	60/100
57	64119	Kansas City	MO	Zone 1 (High)	60/100
58	64120	Kansas City	MO	Zone 1 (High)	60/100
59	64126	Kansas City	MO	Zone 1 (High)	60/100
60	64129	Kansas City	MO	Zone 1 (High)	60/100
61	64133	Kansas City	MO	Zone 1 (High)	60/100
62	64138	Kansas City	MO	Zone 1 (High)	60/100
63	64152	Kansas City	MO	Zone 1 (High)	60/100
64	64446	Fairfax	MO	Zone 1 (High)	60/100
65	63620	Annapolis	MO	Zone 1 (High)	61/100
66	64018	Camden Point	MO	Zone 1 (High)	61/100
67	64428	Burlington Junction	MO	Zone 1 (High)	61/100
68	64725	Archie	MO	Zone 1 (High)	61/100
69	64012	Belton	MO	Zone 1 (High)	62/100
70	64063	Lees Summit	MO	Zone 1 (High)	62/100
71	64068	Liberty	MO	Zone 1 (High)	62/100
72	64081	Lees Summit	MO	Zone 1 (High)	62/100
73	64086	Lees Summit	MO	Zone 1 (High)	62/100
74	64439	Dearborn	MO	Zone 1 (High)	62/100
75	64002	Lees Summit	MO	Zone 1 (High)	63/100
76	64065	Lees Summit	MO	Zone 1 (High)	63/100
77	64069	Liberty	MO	Zone 1 (High)	63/100
78	64079	Platte City	MO	Zone 1 (High)	63/100
79	64444	Edgerton	MO	Zone 1 (High)	63/100
80	64482	Rock Port	MO	Zone 1 (High)	63/100
81	64483	Rosendale	MO	Zone 1 (High)	63/100
82	63623	Belleview	MO	Zone 1 (High)	64/100
83	64016	Buckner	MO	Zone 1 (High)	64/100
84	64083	Raymore	MO	Zone 1 (High)	64/100
85	64098	Weston	MO	Zone 1 (High)	64/100
86	64443	Easton	MO	Zone 1 (High)	64/100
87	64451	Forest City	MO	Zone 1 (High)	64/100
88	64455	Graham	MO	Zone 1 (High)	64/100
89	64468	Maryville	MO	Zone 1 (High)	64/100
90	64496	Watson	MO	Zone 1 (High)	64/100
91	64701	Harrisonville	MO	Zone 1 (High)	64/100
92	64015	Blue Springs	MO	Zone 1 (High)	65/100
93	64029	Grain Valley	MO	Zone 1 (High)	65/100
94	64030	Grandview	MO	Zone 1 (High)	65/100
95	64034	Greenwood	MO	Zone 1 (High)	65/100
96	64050	Independence	MO	Zone 1 (High)	65/100
97	64053	Independence	MO	Zone 1 (High)	65/100
98	64054	Independence	MO	Zone 1 (High)	65/100
99	64055	Independence	MO	Zone 1 (High)	65/100
100	64056	Independence	MO	Zone 1 (High)	65/100

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%.