ZIP 83318 falls in Cassia County, Idaho, where we hold 4,973 parcels measured as septic county-wide and 3,523 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 83318.
ZCTA 83318 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) |
|---|---|---|---|---|
| Cassia County, Idaho | 100% | 4,962 | 4,973 | 3,523 |
| Minidoka County, Idaho | 0% | 1,584 | 3,852 | 3,964 |
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 4,973 parcels measured as septic for Cassia County, Idaho as a whole, not broken out by ZIP.
ZIP 83318 spans 2 counties: Cassia County, Idaho, Minidoka County, Idaho.