ZIP 98502 falls in Thurston County, Washington, where we hold 28,502 parcels measured as septic county-wide and 60,687 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 98502.
ZCTA 98502 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) |
|---|---|---|---|---|
| Thurston County, Washington | 99% | 26,354 | 28,502 | 60,687 |
| Mason County, Washington | 1% | 76,934 | 20,373 | 5,803 |
3 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 |
|---|---|---|---|
| Affordable septics weathertight Construction | Olympia | (360) 763-6577 | 5.0 (1) |
| Abraham's Plumbing Services | Olympia | (360) 438-8304 | 3.5 (6) |
| Bay Shore Construction | Olympia | (360) 866-9200 | — |
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 28,502 parcels measured as septic for Thurston County, Washington as a whole, not broken out by ZIP.
ZIP 98502 spans 2 counties: Thurston County, Washington, Mason County, Washington.