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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/99363

99363

ZIP 99363 is Wallula, Washington, in Walla Walla County; area code 509; Pacific time.

Type
Standard
Time zone
America/Los_Angeles
County
Walla Walla
Metro area
Walla Walla, WA
Population
145
Coordinates
46.0456, -118.8853
☼ Live from 99363 — Wallula, WA

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Where 99363 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 99363
  • 🔢 Type 99363 into a pocket calculator and turn it upside down: EgEGG — not quite a word, sorry.
  • ➕ As a number, 99,363 = 3 × 11 × 3011. Its digits add up to 30, a total 1,024 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11000010000100011
  • 🏠 Its numerical neighbours: 99362 (Walla Walla, WA, 28 mi away) and 99371 (Washtucna, WA, 57 mi away).
  • 🔄 Backwards, 99363 becomes 36399, which is not a ZIP code at all.
  • 👥 6 other ZIP codes are made of exactly the same digits (63939, 69339, 93639, 96339, 99336, 99633). The farthest-flung twin is 96339 in APO AA, a military post office, 4,998 miles away.
  • 🧭 Farther north than 94% of all ZIP codes, and farther west than 92%.
  • 🎯1,109 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 99363 and you would come out at 46.05°S, 61.11°E — 481 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 46m of daylight. Shortest: 8h 38m.
  • 📏 At 30.9 square miles of land, 99363 is bigger than 46% of ZIP codes — room for about 23 Central Parks.
🌙 The sky over 99363 today
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🌋 Shake report
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Source: USGS.

People and housing

Population145This ZIP145
Households28This ZIP28
Housing units52This ZIP52
Median age6.2This ZIP6.2Washington38.3US 38.9
Median home value$253,300This ZIP$253,300Washington$564,600US $332,700
Bachelor's degree or higher0.0%
Population density4.7 / sq miThis ZIP4.7 / sq mi

Business and tax activity

Business establishments17This ZIP17
Employees2,214This ZIP2,214
Annual payroll$160,864,000This ZIP$160,864,000

Land area

Land area30.88 sq miThis ZIP30.88 sq mi
Water area10.61 sq miThis ZIP10.61 sq mi

Other place names in 99363

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

ZIP codes near 99363

ZIPCityDistance
99323 Burbank, WA 10.0 mi
99337 Kennewick, WA 10.2 mi
99360 Touchet, WA 10.9 mi
97835 Helix, OR 11.5 mi
99302 Pasco, WA 16.5 mi
99336 Kennewick, WA 18.1 mi
99346 Plymouth, WA 20.1 mi
97875 Stanfield, OR 20.3 mi
99338 Kennewick, WA 20.6 mi
97813 Athena, OR 21.7 mi

Find every ZIP code within 10 miles of 99363 →

Questions about this ZIP code

Where is ZIP code 99363?

99363 is in Wallula, Washington, in Walla Walla County, part of the Walla Walla, WA metropolitan area. Its published point location is 46.0456, -118.8853.

What county is 99363 in?

99363 lies in Walla Walla County.

What area code is 99363?

Wallula uses area code 509, from NANPA's telephone records.

What time zone is 99363 in?

99363 uses America/Los_Angeles.

How many people live in 99363?

About 145 people live in ZIP code 99363, in 28 households, at 4.7 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 99363?

The closest are 99323 (10 mi), 99337 (10.2 mi), 99360 (10.9 mi), 97835 (11.5 mi) and 99302 (16.5 mi).

Is 99363 a PO Box ZIP code?

99363 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “99363 ZIP Code — Wallula, Washington (Walla Walla County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/99363

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