Zip Code 98278 — Oak Harbor, WA
98278 is a ZIP Code associated with Oak Harbor, WA, located within Island. 98278 ranks #8 out of 8 ZIP codes in Island County by population (and #368 out of 605 in WA). The area supports an estimated population of 1,932 residents across Data Pending housing units, with a population density of 176.7 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (48.343880, -122.664910)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 98278 |
| Primary City | Oak Harbor |
| State / Province | WA |
| County | Island |
| Total Population | 1,932 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 176.7 people/sq mi |
| Timezone | America/Los_Angeles |
How 98278 Compares
| Metric | ZIP 98278 | Island County | WA State Average |
|---|
| Population | 1,932 | 86,836 (Total) | 7,816,021 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 176.7 /sq mi | -- | -- |
| County Pop Rank | #8 of 8 | -- | -- |
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 →