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ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/98278

98278

ZIP 98278 is in Oak Harbor, Washington, in Island County; area codes 360 and 564; Pacific time. Oak Harbor has 2 ZIP codes; the other is 98277.

Type
Standard
Time zone
America/Los_Angeles
County
Island
Metro area
Oak Harbor, WA
Population
1,932
Coordinates
48.3406, -122.6740
☼ Live from 98278 — Oak Harbor, WA

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Where 98278 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 98278
  • 🔢 Type 98278 into a pocket calculator and turn it upside down: BLZBG — not quite a word, sorry.
  • ➕ As a number, 98,278 = 2 × 49139. Its digits add up to 34, a total 322 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111111111100110
  • 🏠 Its numerical neighbours: 98277 (Oak Harbor, WA, 3 mi away) and 98279 (Olga, WA, 21 mi away).
  • 🔄 Backwards, 98278 becomes 87289, which is not a ZIP code at all.
  • 👥 12 other ZIP codes are made of exactly the same digits (27889, 28789, 78289, 78298, 78829, 87829, …). The farthest-flung twin is 27889 in Washington, NC, 2,463 miles away.
  • 🧭 Farther north than 98% of all ZIP codes, and farther west than 97%.
  • 🎯1,325 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 98278 and you would come out at 48.34°S, 57.33°E — 590 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 16h 06m of daylight. Shortest: 8h 19m.
  • 📏 At 4.2 square miles of land, 98278 is bigger than 17% of ZIP codes — room for about 3.2 Central Parks.
🌙 The sky over 98278 today
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🌋 Shake report
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Source: USGS.

People and housing

Population1,932This ZIP1,932
Households0
Housing units0
Median age22.0This ZIP22.0Washington38.3US 38.9
Bachelor's degree or higher13.8%This ZIP13.8%
Mean commute6.2 minThis ZIP6.2 min
Population density457.6 / sq miThis ZIP457.6 / sq mi

Business and tax activity

Business establishments29This ZIP29
Employees1,024This ZIP1,024
Annual payroll$60,910,000This ZIP$60,910,000

Land area

Land area4.22 sq miThis ZIP4.22 sq mi
Water area1.42 sq miThis ZIP1.42 sq mi

Other place names in 98278

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 98278

ZIPCityDistance
98277 Oak Harbor, WA 2.5 mi
98221 Anacortes, WA 8.5 mi
98257 La Conner, WA 8.7 mi
98239 Coupeville, WA 9.9 mi
98282 Camano Island, WA 12.0 mi
98261 Lopez Island, WA 13.7 mi
98273 Mount Vernon, WA 14.3 mi
98238 Conway, WA 15.1 mi
98222 Blakely Island, WA 17.2 mi
98253 Greenbank, WA 18.3 mi

Find every ZIP code within 10 miles of 98278 →

Questions about this ZIP code

Where is ZIP code 98278?

98278 is in Oak Harbor, Washington, in Island County, part of the Oak Harbor, WA micropolitan area. Its published point location is 48.3406, -122.6740.

What county is 98278 in?

98278 lies in Island County.

What area code is 98278?

Oak Harbor uses area codes 360 and 564, from NANPA's telephone records.

What time zone is 98278 in?

98278 uses America/Los_Angeles.

How many people live in 98278?

About 1,932 people live in ZIP code 98278, at 457.6 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What ZIP codes are near 98278?

The closest are 98277 (2.5 mi), 98221 (8.5 mi), 98257 (8.7 mi), 98239 (9.9 mi) and 98282 (12 mi).

Is 98278 a PO Box ZIP code?

98278 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “98278 ZIP Code — Oak Harbor, Washington (Island County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/98278

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