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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/90603

90603

ZIP 90603 is in Whittier, California, in Los Angeles County; area code 562; Pacific time. Whittier has 10 ZIP codes in all.

Type
Standard
Time zone
America/Los_Angeles
County
Los Angeles
Population
21,118
Coordinates
33.9449, -117.9923
☼ Live from 90603 — Whittier, CA

Weather right now

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Local time: —

Where 90603 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 90603
  • 🔢 Type 90603 into a pocket calculator and turn it upside down: EOgOG — not quite a word, sorry.
  • ➕ As a number, 90,603 = 3 × 3 × 10067. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110000111101011
  • 🏠 Its numerical neighbours: 90602 (Whittier, CA, 3 mi away) and 90604 (Whittier, CA, 2 mi away).
  • 🔄 Backwards, 90603 becomes 30609 — and that is a real ZIP code: Athens, GA, 1,975 miles away.
  • 👥 31 other ZIP codes are made of exactly the same digits (00693, 00936, 00963, 03609, 03906, 06039, …). The farthest-flung twin is 09630 in APO AE, a military post office, 6,105 miles away.
  • 🧭 Farther south than 79% of all ZIP codes, and farther west than 91%.
  • 🎯1,144 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 90603 and you would come out at 33.94°S, 62.01°E — 987 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 25m of daylight. Shortest: 9h 53m.
  • 📏 At 3.2 square miles of land, 90603 is bigger than 15% of ZIP codes — room for about 2.4 Central Parks.
🌙 The sky over 90603 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population21,118This ZIP21,118
Households6,504This ZIP6,504
Housing units6,746This ZIP6,746
Median age40.8This ZIP40.8California37.9US 38.9
Median household income$136,705This ZIP$136,705California$99,122US $80,734
Median home value$859,000This ZIP$859,000California$734,700US $332,700
Median gross rent$2,344This ZIP$2,344California$2,036US $1,413
Bachelor's degree or higher34.2%This ZIP34.2%
Mean commute32.0 minThis ZIP32.0 min
Population density6,676.6 / sq miThis ZIP6,676.6 / sq mi

Business and tax activity

Business establishments458This ZIP458
Employees5,612This ZIP5,612
Annual payroll$269,654,000This ZIP$269,654,000
Tax returns filed10,170This ZIP10,170
Total adjusted gross income$1,038,772,000This ZIP$1,038,772,000

Land area

Land area3.16 sq miThis ZIP3.16 sq mi
Water area0.00 sq mi

Other place names in 90603

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

ZIP codes near 90603

ZIPCityDistance
90604 Whittier, CA 1.7 mi
90605 Whittier, CA 1.7 mi
90637 La Mirada, CA 2.2 mi
90631 La Habra, CA 2.3 mi
90602 Whittier, CA 2.7 mi
90633 La Habra, CA 2.8 mi
90639 La Mirada, CA 3.0 mi
90632 La Habra, CA 3.0 mi
90638 La Mirada, CA 3.1 mi
90607 Whittier, CA 3.3 mi

Find every ZIP code within 10 miles of 90603 →

Questions about this ZIP code

Where is ZIP code 90603?

90603 is in Whittier, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 33.9449, -117.9923.

What county is 90603 in?

90603 lies in Los Angeles County.

What area code is 90603?

Whittier uses area code 562, from NANPA's telephone records.

What time zone is 90603 in?

90603 uses America/Los_Angeles.

How many people live in 90603?

About 21,118 people live in ZIP code 90603, in 6,504 households, at 6,676.6 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 90603?

$136,705 a year, against $99,122 across California.

What ZIP codes are near 90603?

The closest are 90604 (1.7 mi), 90605 (1.7 mi), 90637 (2.2 mi), 90631 (2.3 mi) and 90602 (2.7 mi).

Is 90603 a PO Box ZIP code?

90603 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “90603 ZIP Code — Whittier, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/90603

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