ZIP 83436 falls in Madison County, Idaho, where we hold 3,793 parcels measured as septic county-wide and 4,149 on sewer. We do not have a per-ZIP parcel count for this county, so this is the county total, not a count specific to ZIP 83436.
ZCTA 83436 is not entirely inside one county. Land-area share is from the 2020 Census ZCTA-to-county relationship file.
| County | Land in this ZIP | Documents held | On septic (county) | On sewer (county) |
|---|---|---|---|---|
| Madison County, Idaho | 76% | — | 3,793 | 4,149 |
| Teton County, Idaho | 18% | 2 | 2,650 | 2,369 |
| Fremont County, Idaho | 6% | — | 7,326 | 1,568 |
Land-area overlap is from the 2020 Census Bureau ZCTA5-to-county relationship file, not an estimate of ours. Parcel and document counts are rows we hold, not a survey of every property in the ZIP. Last verified 2026-09-01.
We hold 3,793 parcels measured as septic for Madison County, Idaho as a whole, not broken out by ZIP.
ZIP 83436 spans 3 counties: Madison County, Idaho, Teton County, Idaho, Fremont County, Idaho.