ZIP code · Oak Harbor · Washington · United States
ZIP code 98278 — Oak Harbor
ZIP code 98278 serves Oak Harbor, Washington.
- Postal code
- 98278Single source Value from one source, not cross-checked.
- City
- Oak Harbor
- County
- Island FIPS 53029
- State
- Washington
- Country
- United States
- Coordinates
- 48.3402, -122.6695 — precision precise (locality)
View on OpenStreetMap - Population
- 2,178 (ZCTA, ACS 5-year)
- Population density
- 516 / sq mi
- Land area
- 4.2 sq mi (10.9 km²) (ZCTA, ACS 5-year)
- Per-capita income
- $29,045
- Median age
- 22
- Households
- 0
- Housing units
- 0
- Congressional district
- WA-2 (119th Congress)
- USDA hardiness zone
- 8b (15 to 20 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
Tools: compare 98278 with another ZIP · ZIPs within 25 miles · distance from 98278
Map of ZIP code 98278
Climate — monthly normals
Warmest month Aug (avg high 70°F), coldest Feb (avg low 37°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 49 | 51 | 55 | 58 | 62 | 66 | 69 | 70 | 67 | 60 | 54 | 49 |
| Avg low °F | 38 | 37 | 40 | 43 | 48 | 52 | 54 | 54 | 50 | 46 | 41 | 38 |
| Precip in | 2.4 | 1.6 | 1.7 | 1.7 | 1.7 | 1.1 | 0.6 | 0.8 | 1.1 | 2.0 | 3.1 | 1.9 |
NOAA 1991–2020 climate normals from the nearest station: WHIDBEY ISLAND NAS (0.7 mi) · NOAA NCEI
Places in ZIP 98278
- 2 restaurants & cafés
- 1 parks
- 1 playgrounds
- 1 gyms & sports centres
- 1 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page