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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/98178

98178

ZIP 98178 is in Seattle, Washington, in King County; area code 206; Pacific time. Seattle has 59 ZIP codes in all.

Type
Standard
Time zone
America/Los_Angeles
County
King
Population
26,748
Coordinates
47.4988, -122.2451
☼ Live from 98178 — Seattle, WA

Weather right now

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Where 98178 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 98178
  • 🔢 Type 98178 into a pocket calculator and turn it upside down: BLIBG — not quite a word, sorry.
  • ➕ As a number, 98,178 = 2 × 3 × 16363. Its digits add up to 33, a total 456 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111111110000010
  • 🏠 Its numerical neighbours: 98177 (Seattle, WA, 18 mi away) and 98181 (Seattle, WA, 8 mi away).
  • 🔄 Backwards, 98178 becomes 87189, which is not a ZIP code at all.
  • 👥 6 other ZIP codes are made of exactly the same digits (17889, 87198, 89178, 91788, 97818, 98817). The farthest-flung twin is 17889 in Winfield, PA, 2,258 miles away.
  • 🧭 Farther north than 96% of all ZIP codes, and farther west than 96%.
  • 🎯1,289 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 98178 and you would come out at 47.50°S, 57.75°E — 585 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 58m of daylight. Shortest: 8h 26m.
  • 📏 At 4.9 square miles of land, 98178 is bigger than 19% of ZIP codes — room for about 3.7 Central Parks.
🌙 The sky over 98178 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population26,748This ZIP26,748
Households9,349This ZIP9,349
Housing units9,988This ZIP9,988
Median age39.7This ZIP39.7Washington38.3US 38.9
Median household income$99,505This ZIP$99,505Washington$98,141US $80,734
Median home value$660,400This ZIP$660,400Washington$564,600US $332,700
Median gross rent$1,869This ZIP$1,869Washington$1,760US $1,413
Bachelor's degree or higher36.1%This ZIP36.1%
Mean commute30.6 minThis ZIP30.6 min
Population density5,457.7 / sq miThis ZIP5,457.7 / sq mi

Business and tax activity

Business establishments311This ZIP311
Employees1,850This ZIP1,850
Annual payroll$122,068,000This ZIP$122,068,000
Tax returns filed13,150This ZIP13,150
Total adjusted gross income$1,123,336,000This ZIP$1,123,336,000

Land area

Land area4.90 sq miThis ZIP4.90 sq mi
Water area1.04 sq miThis ZIP1.04 sq mi

Other place names in 98178

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

ZIP codes near 98178

ZIPCityDistance
98057 Renton, WA 2.2 mi
98168 Seattle, WA 2.6 mi
98056 Renton, WA 2.8 mi
98118 Seattle, WA 3.2 mi
98108 Seattle, WA 3.8 mi
98188 Seattle, WA 3.8 mi
98055 Renton, WA 4.1 mi
98158 Seattle, WA 4.4 mi
98040 Mercer Island, WA 4.6 mi
98148 Seattle, WA 5.3 mi

Find every ZIP code within 10 miles of 98178 →

Questions about this ZIP code

Where is ZIP code 98178?

98178 is in Seattle, Washington, in King County, part of the Seattle-Tacoma-Bellevue, WA metropolitan area. Its published point location is 47.4988, -122.2451.

What county is 98178 in?

98178 lies in King County.

What area code is 98178?

Seattle uses area code 206, from NANPA's telephone records.

What time zone is 98178 in?

98178 uses America/Los_Angeles.

How many people live in 98178?

About 26,748 people live in ZIP code 98178, in 9,349 households, at 5,457.7 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 98178?

$99,505 a year, against $98,141 across Washington.

What ZIP codes are near 98178?

The closest are 98057 (2.2 mi), 98168 (2.6 mi), 98056 (2.8 mi), 98118 (3.2 mi) and 98108 (3.8 mi).

Is 98178 a PO Box ZIP code?

98178 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “98178 ZIP Code — Seattle, Washington (King County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/98178

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