We have 3,790 parcels measured as septic in ZIP 85390 itself (Maricopa County, Arizona), out of 4,534 parcels in our records for this ZIP.
ZCTA 85390 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) |
|---|---|---|---|---|
| Maricopa County, Arizona | 76% | 223,158 | 103,791 | 1,420,870 |
| Yavapai County, Arizona | 24% | — | — | — |
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 have measured 3,790 parcels as septic in ZIP 85390 itself, out of 4,534 parcels in our records for this ZIP.
ZIP 85390 spans 2 counties: Maricopa County, Arizona, Yavapai County, Arizona.