ZIP 98528 falls in Mason County, Washington, where we hold 20,373 parcels measured as septic county-wide and 5,803 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 98528.
ZCTA 98528 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) |
|---|---|---|---|---|
| Mason County, Washington | 100% | 76,934 | 20,373 | 5,803 |
| Kitsap County, Washington | 0% | 185,502 | 26,305 | 52,943 |
1 businesses on record with an address in this ZIP: pumping, installation, design, inspection and repair. Not an endorsement, and we take no fee.
| Company | City | Phone | Rating |
|---|---|---|---|
| Kurt's Septic Pumping & Maintenance | Belfair | (360) 275-1996 | 4.1 (8) |
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 20,373 parcels measured as septic for Mason County, Washington as a whole, not broken out by ZIP.
ZIP 98528 spans 2 counties: Mason County, Washington, Kitsap County, Washington.