ZIP 98331 falls in Jefferson County, Washington, where we hold 11,899 parcels measured as septic county-wide and 4,275 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 98331.
ZCTA 98331 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) |
|---|---|---|---|---|
| Jefferson County, Washington | 79% | 16,878 | 11,899 | 4,275 |
| Clallam County, Washington | 21% | 32,751 | 19,352 | 11,728 |
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 11,899 parcels measured as septic for Jefferson County, Washington as a whole, not broken out by ZIP.
ZIP 98331 spans 2 counties: Jefferson County, Washington, Clallam County, Washington.