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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/99003

99003

ZIP 99003 is Chattaroy, Washington, in Spokane County; area code 509; Pacific time.

Type
Standard
Time zone
America/Los_Angeles
County
Spokane
Population
4,810
Coordinates
47.9171, -117.2749
☼ Live from 99003 — Chattaroy, WA

Weather right now

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Local time: —

Where 99003 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 99003
  • 🔢 Type 99003 into a pocket calculator and turn it upside down: EOOGG — not quite a word, sorry.
  • ➕ As a number, 99,003 = 3 × 61 × 541. Its digits add up to 21, a total 2,594 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11000001010111011
  • 🏠 Its numerical neighbours: 99001 (Airway Heights, WA, 24 mi away) and 99004 (Cheney, WA, 38 mi away).
  • 🔄 Backwards, 99003 becomes 30099 — and that is a real ZIP code: Duluth, GA, 1,960 miles away.
  • 👥 11 other ZIP codes are made of exactly the same digits (00939, 03909, 09039, 30099, 30909, 39090, …). The farthest-flung twin is 09039 in APO AE, a military post office, 4,941 miles away.
  • 🧭 Farther north than 97% of all ZIP codes, and farther west than 90%.
  • 🎯1,082 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 99003 and you would come out at 47.92°S, 62.73°E — 356 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 16h 02m of daylight. Shortest: 8h 23m.
  • 📏 At 76.2 square miles of land, 99003 is bigger than 71% of ZIP codes — room for about 58 Central Parks.
🌙 The sky over 99003 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population4,810This ZIP4,810
Households1,833This ZIP1,833
Housing units2,319This ZIP2,319
Median age50.5This ZIP50.5Washington38.3US 38.9
Median household income$77,129This ZIP$77,129Washington$98,141US $80,734
Median home value$428,200This ZIP$428,200Washington$564,600US $332,700
Median gross rent$907This ZIP$907Washington$1,760US $1,413
Bachelor's degree or higher21.2%This ZIP21.2%
Mean commute35.5 minThis ZIP35.5 min
Population density63.1 / sq miThis ZIP63.1 / sq mi

Business and tax activity

Business establishments94This ZIP94
Employees385This ZIP385
Annual payroll$17,050,000This ZIP$17,050,000
Tax returns filed2,660This ZIP2,660
Total adjusted gross income$231,657,000This ZIP$231,657,000

Land area

Land area76.23 sq miThis ZIP76.23 sq mi
Water area0.07 sq miThis ZIP0.07 sq mi

ZIP codes near 99003

ZIPCityDistance
99021 Mead, WA 6.2 mi
99005 Colbert, WA 6.5 mi
99009 Elk, WA 7.6 mi
99006 Deer Park, WA 11.0 mi
99217 Spokane, WA 12.2 mi
99208 Spokane, WA 12.2 mi
99025 Newman Lake, WA 12.6 mi
99218 Spokane, WA 12.6 mi
99251 Spokane, WA 13.1 mi
99110 Clayton, WA 15.5 mi

Find every ZIP code within 10 miles of 99003 →

Questions about this ZIP code

Where is ZIP code 99003?

99003 is in Chattaroy, Washington, in Spokane County, part of the Spokane-Spokane Valley, WA metropolitan area. Its published point location is 47.9171, -117.2749.

What county is 99003 in?

99003 lies in Spokane County.

What area code is 99003?

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

What time zone is 99003 in?

99003 uses America/Los_Angeles.

How many people live in 99003?

About 4,810 people live in ZIP code 99003, in 1,833 households, at 63.1 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 99003?

$77,129 a year, against $98,141 across Washington.

What ZIP codes are near 99003?

The closest are 99021 (6.2 mi), 99005 (6.5 mi), 99009 (7.6 mi), 99006 (11 mi) and 99217 (12.2 mi).

Is 99003 a PO Box ZIP code?

99003 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “99003 ZIP Code — Chattaroy, Washington (Spokane County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/99003

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