Zip Code 98555 — Lilliwaup, WA
98555 is a ZIP Code associated with Lilliwaup, WA, located within Mason. The postal region supports an estimated population of 324 residents across Data Pending housing units, with a population density of 4.7 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (47.546340, -123.063690)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 98555 |
| Primary City | Lilliwaup |
| State / Province | WA |
| County | Mason |
| Total Population | 324 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 4.7 people/sq mi |
| Timezone | America/Los_Angeles |
How 98555 Compares
| Metric | ZIP 98555 | Mason County | WA State Average |
|---|
| Population | 324 | 66,064 | 7,816,021 |
| Median Income | Data Pending | N/A | N/A |
| Population Density | 4.7 /sq mi | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →