ZIP 97056 falls in Columbia County, Oregon, where we hold 413 septic-related documents. We have not classified septic-versus-sewer status for this county, and we do not have a per-ZIP parcel count -- see the county page for what we hold and where the records are kept.
ZCTA 97056 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) |
|---|---|---|---|---|
| Columbia County, Oregon | 85% | 413 | — | — |
| Washington County, Oregon | 11% | — | 10,442 | 134,730 |
| Multnomah County, Oregon | 4% | 5,457 | 2,955 | 207,636 |
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 not measured septic-versus-sewer status for this county yet.
ZIP 97056 spans 3 counties: Columbia County, Oregon, Washington County, Oregon, Multnomah County, Oregon.