ZIP 83638 falls in Valley County, Idaho, where we hold 4,534 parcels measured as septic county-wide and 6,548 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 83638.
ZCTA 83638 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) |
|---|---|---|---|---|
| Valley County, Idaho | 52% | 7,967 | 4,534 | 6,548 |
| Idaho County, Idaho | 47% | — | 5,790 | 3,263 |
| Adams County, Idaho | 1% | 1,593 | 1,953 | 829 |
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 4,534 parcels measured as septic for Valley County, Idaho as a whole, not broken out by ZIP.
ZIP 83638 spans 3 counties: Valley County, Idaho, Idaho County, Idaho, Adams County, Idaho.