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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/95503

95503

ZIP 95503 is in Eureka, California, in Humboldt County; area codes 707 and 369; Pacific time. Eureka has 3 ZIP codes; the others are 95501 and 95502.

Type
Standard
Time zone
America/Los_Angeles
County
Humboldt
Metro area
Eureka-Arcata, CA
Population
25,054
Coordinates
40.7384, -124.1078
☼ Live from 95503 — Eureka, CA

Weather right now

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Local time: —

Where 95503 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 95503
  • 🔢 Type 95503 into a pocket calculator and turn it upside down: EOSSG — not quite a word, sorry.
  • ➕ As a number, 95,503 = 43 × 2221. Its digits add up to 22, a total 2,607 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111010100001111
  • 🏠 Its numerical neighbours: 95502 (Eureka, CA, 5 mi away) and 95511 (Alderpoint, CA, 48 mi away).
  • 🔄 Backwards, 95503 becomes 30559 — and that is a real ZIP code: Mineral Bluff, GA, 2,190 miles away.
  • 👥 27 other ZIP codes are made of exactly the same digits (03595, 05359, 09355, 30559, 35905, 35950, …). The farthest-flung twin is 09355 in APO AE, a military post office, 5,359 miles away.
  • 🧭 Farther north than 64% of all ZIP codes, and farther west than 98%.
  • 🎯1,342 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 95503 and you would come out at 40.74°S, 55.89°E — 916 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 06m of daylight. Shortest: 9h 15m.
  • 📏 At 83.7 square miles of land, 95503 is bigger than 74% of ZIP codes — room for about 64 Central Parks.
🌙 The sky over 95503 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population25,054This ZIP25,054
Households9,982This ZIP9,982
Housing units10,677This ZIP10,677
Median age41.4This ZIP41.4California37.9US 38.9
Median household income$71,855This ZIP$71,855California$99,122US $80,734
Median home value$444,700This ZIP$444,700California$734,700US $332,700
Median gross rent$1,557This ZIP$1,557California$2,036US $1,413
Bachelor's degree or higher29.1%This ZIP29.1%
Mean commute16.3 minThis ZIP16.3 min
Population density299.3 / sq miThis ZIP299.3 / sq mi

Business and tax activity

Business establishments335This ZIP335
Employees2,879This ZIP2,879
Annual payroll$145,812,000This ZIP$145,812,000
Tax returns filed10,400This ZIP10,400
Total adjusted gross income$764,823,000This ZIP$764,823,000

Land area

Land area83.72 sq miThis ZIP83.72 sq mi
Water area0.87 sq miThis ZIP0.87 sq mi

Other place names in 95503

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

ZIP codes near 95503

ZIPCityDistance
95501 Eureka, CA 4.8 mi
95502 Eureka, CA 5.3 mi
95534 Cutten, CA 5.3 mi
95537 Fields Landing, CA 5.9 mi
95564 Samoa, CA 6.2 mi
95524 Bayside, CA 6.4 mi
95551 Loleta, CA 7.8 mi
95521 Arcata, CA 8.0 mi
95518 Arcata, CA 9.1 mi
95549 Kneeland, CA 11.6 mi

Find every ZIP code within 10 miles of 95503 →

Questions about this ZIP code

Where is ZIP code 95503?

95503 is in Eureka, California, in Humboldt County, part of the Eureka-Arcata, CA micropolitan area. Its published point location is 40.7384, -124.1078.

What county is 95503 in?

95503 lies in Humboldt County.

What area code is 95503?

Eureka uses area codes 707 and 369, from NANPA's telephone records.

What time zone is 95503 in?

95503 uses America/Los_Angeles.

How many people live in 95503?

About 25,054 people live in ZIP code 95503, in 9,982 households, at 299.3 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 95503?

$71,855 a year, against $99,122 across California.

What ZIP codes are near 95503?

The closest are 95501 (4.8 mi), 95502 (5.3 mi), 95534 (5.3 mi), 95537 (5.9 mi) and 95564 (6.2 mi).

Is 95503 a PO Box ZIP code?

95503 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “95503 ZIP Code — Eureka, California (Humboldt County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/95503

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