Out of 635 ZIP codes with data in Indiana, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes in EPA Radon Zone 1 | All Indiana Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 635 |
| Lowest value | Zone 1 (highest potential) |
| Median value | Zone 1 (highest potential) |
| State | Indiana |
100 Lowest-Ranked ZIP Codes
| Rank | ZIP Code | City | State | Radon Zone | Safety Score |
|---|---|---|---|---|---|
| 1 | 46614 | South Bend | IN | Zone 1 (highest potential) | 33/100 |
| 2 | 47111 | Charlestown | IN | Zone 1 (highest potential) | 41/100 |
| 3 | 47141 | Marysville | IN | Zone 1 (highest potential) | 42/100 |
| 4 | 46516 | Elkhart | IN | Zone 1 (highest potential) | 44/100 |
| 5 | 46011 | Anderson | IN | Zone 1 (highest potential) | 45/100 |
| 6 | 46013 | Anderson | IN | Zone 1 (highest potential) | 46/100 |
| 7 | 47143 | Memphis | IN | Zone 1 (highest potential) | 46/100 |
| 8 | 46222 | Indianapolis | IN | Zone 1 (highest potential) | 47/100 |
| 9 | 46224 | Indianapolis | IN | Zone 1 (highest potential) | 47/100 |
| 10 | 46552 | New Carlisle | IN | Zone 1 (highest potential) | 47/100 |
| 11 | 47201 | Columbus | IN | Zone 1 (highest potential) | 47/100 |
| 12 | 46016 | Anderson | IN | Zone 1 (highest potential) | 48/100 |
| 13 | 46514 | Elkhart | IN | Zone 1 (highest potential) | 48/100 |
| 14 | 46517 | Elkhart | IN | Zone 1 (highest potential) | 48/100 |
| 15 | 46530 | Granger | IN | Zone 1 (highest potential) | 48/100 |
| 16 | 46544 | Mishawaka | IN | Zone 1 (highest potential) | 48/100 |
| 17 | 46554 | North Liberty | IN | Zone 1 (highest potential) | 48/100 |
| 18 | 46561 | Osceola | IN | Zone 1 (highest potential) | 48/100 |
| 19 | 46637 | South Bend | IN | Zone 1 (highest potential) | 48/100 |
| 20 | 47177 | Underwood | IN | Zone 1 (highest potential) | 48/100 |
| 21 | 46556 | Notre Dame | IN | Zone 1 (highest potential) | 49/100 |
| 22 | 46617 | South Bend | IN | Zone 1 (highest potential) | 49/100 |
| 23 | 47126 | Henryville | IN | Zone 1 (highest potential) | 49/100 |
| 24 | 47163 | Otisco | IN | Zone 1 (highest potential) | 49/100 |
| 25 | 46545 | Mishawaka | IN | Zone 1 (highest potential) | 50/100 |
| 26 | 46601 | South Bend | IN | Zone 1 (highest potential) | 50/100 |
| 27 | 46613 | South Bend | IN | Zone 1 (highest potential) | 50/100 |
| 28 | 46615 | South Bend | IN | Zone 1 (highest potential) | 50/100 |
| 29 | 46616 | South Bend | IN | Zone 1 (highest potential) | 50/100 |
| 30 | 46619 | South Bend | IN | Zone 1 (highest potential) | 50/100 |
| 31 | 46628 | South Bend | IN | Zone 1 (highest potential) | 50/100 |
| 32 | 46635 | South Bend | IN | Zone 1 (highest potential) | 50/100 |
| 33 | 47960 | Monticello | IN | Zone 1 (highest potential) | 50/100 |
| 34 | 47905 | Lafayette | IN | Zone 1 (highest potential) | 53/100 |
| 35 | 46528 | Goshen | IN | Zone 1 (highest potential) | 55/100 |
| 36 | 46240 | Indianapolis | IN | Zone 1 (highest potential) | 56/100 |
| 37 | 46260 | Indianapolis | IN | Zone 1 (highest potential) | 56/100 |
| 38 | 46268 | Indianapolis | IN | Zone 1 (highest potential) | 56/100 |
| 39 | 46216 | Indianapolis | IN | Zone 1 (highest potential) | 57/100 |
| 40 | 46226 | Indianapolis | IN | Zone 1 (highest potential) | 57/100 |
| 41 | 46231 | Indianapolis | IN | Zone 1 (highest potential) | 57/100 |
| 42 | 46235 | Indianapolis | IN | Zone 1 (highest potential) | 57/100 |
| 43 | 46236 | Indianapolis | IN | Zone 1 (highest potential) | 57/100 |
| 44 | 46256 | Indianapolis | IN | Zone 1 (highest potential) | 57/100 |
| 45 | 46107 | Beech Grove | IN | Zone 1 (highest potential) | 58/100 |
| 46 | 46201 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 47 | 46202 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 48 | 46203 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 49 | 46204 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 50 | 46205 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 51 | 46208 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 52 | 46214 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 53 | 46217 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 54 | 46218 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 55 | 46219 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 56 | 46220 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 57 | 46221 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 58 | 46225 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 59 | 46227 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 60 | 46228 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 61 | 46229 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 62 | 46237 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 63 | 46239 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 64 | 46241 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 65 | 46250 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 66 | 46254 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 67 | 46259 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 68 | 46278 | Indianapolis | IN | Zone 1 (highest potential) | 58/100 |
| 69 | 46803 | Fort Wayne | IN | Zone 1 (highest potential) | 58/100 |
| 70 | 46806 | Fort Wayne | IN | Zone 1 (highest potential) | 58/100 |
| 71 | 46034 | Cicero | IN | Zone 1 (highest potential) | 60/100 |
| 72 | 46062 | Noblesville | IN | Zone 1 (highest potential) | 60/100 |
| 73 | 46064 | Pendleton | IN | Zone 1 (highest potential) | 62/100 |
| 74 | 47106 | Borden | IN | Zone 1 (highest potential) | 62/100 |
| 75 | 47172 | Sellersburg | IN | Zone 1 (highest potential) | 62/100 |
| 76 | 47401 | Bloomington | IN | Zone 1 (highest potential) | 62/100 |
| 77 | 47906 | West Lafayette | IN | Zone 1 (highest potential) | 62/100 |
| 78 | 46001 | Alexandria | IN | Zone 1 (highest potential) | 63/100 |
| 79 | 46774 | New Haven | IN | Zone 1 (highest potential) | 63/100 |
| 80 | 46845 | Fort Wayne | IN | Zone 1 (highest potential) | 63/100 |
| 81 | 47909 | Lafayette | IN | Zone 1 (highest potential) | 63/100 |
| 82 | 46077 | Zionsville | IN | Zone 1 (highest potential) | 64/100 |
| 83 | 46526 | Goshen | IN | Zone 1 (highest potential) | 64/100 |
| 84 | 46748 | Huntertown | IN | Zone 1 (highest potential) | 64/100 |
| 85 | 46783 | Roanoke | IN | Zone 1 (highest potential) | 64/100 |
| 86 | 46816 | Fort Wayne | IN | Zone 1 (highest potential) | 64/100 |
| 87 | 46818 | Fort Wayne | IN | Zone 1 (highest potential) | 64/100 |
| 88 | 46825 | Fort Wayne | IN | Zone 1 (highest potential) | 64/100 |
| 89 | 47303 | Muncie | IN | Zone 1 (highest potential) | 64/100 |
| 90 | 47403 | Bloomington | IN | Zone 1 (highest potential) | 64/100 |
| 91 | 46032 | Carmel | IN | Zone 1 (highest potential) | 65/100 |
| 92 | 46033 | Carmel | IN | Zone 1 (highest potential) | 65/100 |
| 93 | 46036 | Elwood | IN | Zone 1 (highest potential) | 65/100 |
| 94 | 46051 | Lapel | IN | Zone 1 (highest potential) | 65/100 |
| 95 | 46074 | Westfield | IN | Zone 1 (highest potential) | 65/100 |
| 96 | 46168 | Plainfield | IN | Zone 1 (highest potential) | 65/100 |
| 97 | 46280 | Indianapolis | IN | Zone 1 (highest potential) | 65/100 |
| 98 | 46540 | Middlebury | IN | Zone 1 (highest potential) | 65/100 |
| 99 | 46725 | Columbia City | IN | Zone 1 (highest potential) | 65/100 |
| 100 | 46798 | Yoder | IN | Zone 1 (highest potential) | 65/100 |
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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