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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/94552

94552

ZIP 94552 is in Castro Valley, California, in Alameda County; Pacific time. Castro Valley has 2 ZIP codes; the other is 94546.

Type
Standard
Time zone
America/Los_Angeles
County
Alameda
Population
14,506
Coordinates
37.7058, -122.0076
☼ Live from 94552 — Castro Valley, CA

Weather right now

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Local time: —

Where 94552 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 94552
  • 🔢 Type 94552 into a pocket calculator and turn it upside down: ZSShG — not quite a word, sorry.
  • ➕ As a number, 94,552 = 2 × 2 × 2 × 53 × 223. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000101011000
  • 🏠 Its numerical neighbours: 94551 (Livermore, CA, 14 mi away) and 94553 (Martinez, CA, 21 mi away).
  • 🔄 Backwards, 94552 becomes 25549, which is not a ZIP code at all.
  • 👥 27 other ZIP codes are made of exactly the same digits (24595, 29455, 29545, 29554, 49255, 49525, …). The farthest-flung twin is 29545 in Green Sea, SC, 2,399 miles away.
  • 🧭 Farther south than 60% of all ZIP codes, and farther west than 96%.
  • 🎯1,267 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94552 and you would come out at 37.71°S, 57.99°E — 1,008 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 46m of daylight. Shortest: 9h 33m.
  • 📏 At 51.8 square miles of land, 94552 is bigger than 60% of ZIP codes — room for about 39 Central Parks.
🌙 The sky over 94552 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population14,506This ZIP14,506
Households5,021This ZIP5,021
Housing units5,088This ZIP5,088
Median age48.9This ZIP48.9California37.9US 38.9
Median household income$212,605This ZIP$212,605California$99,122US $80,734
Median home value$1,394,300This ZIP$1,394,300California$734,700US $332,700
Median gross rent$3,197This ZIP$3,197California$2,036US $1,413
Bachelor's degree or higher61.0%This ZIP61.0%
Mean commute34.5 minThis ZIP34.5 min
Population density280.0 / sq miThis ZIP280.0 / sq mi

Business and tax activity

Business establishments197This ZIP197
Employees960This ZIP960
Annual payroll$53,589,000This ZIP$53,589,000
Tax returns filed7,040This ZIP7,040
Total adjusted gross income$1,325,891,000This ZIP$1,325,891,000

Land area

Land area51.80 sq miThis ZIP51.80 sq mi
Water area0.02 sq miThis ZIP0.02 sq mi

Other place names in 94552

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

ZIP codes near 94552

ZIPCityDistance
94542 Hayward, CA 3.6 mi
94583 San Ramon, CA 4.7 mi
94543 Hayward, CA 4.7 mi
94541 Hayward, CA 4.9 mi
94537 Fremont, CA 5.0 mi
94540 Hayward, CA 5.0 mi
94557 Hayward, CA 5.0 mi
94544 Hayward, CA 5.7 mi
94570 Moraga, CA 5.7 mi
94568 Dublin, CA 5.9 mi

Find every ZIP code within 10 miles of 94552 →

Questions about this ZIP code

Where is ZIP code 94552?

94552 is in Castro Valley, California, in Alameda County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.7058, -122.0076.

What county is 94552 in?

94552 lies in Alameda County.

What time zone is 94552 in?

94552 uses America/Los_Angeles.

How many people live in 94552?

About 14,506 people live in ZIP code 94552, in 5,021 households, at 280.0 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 94552?

$212,605 a year, against $99,122 across California.

What ZIP codes are near 94552?

The closest are 94542 (3.6 mi), 94583 (4.7 mi), 94543 (4.7 mi), 94541 (4.9 mi) and 94537 (5 mi).

Is 94552 a PO Box ZIP code?

94552 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94552 ZIP Code — Castro Valley, California (Alameda County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94552

Machine-readable version of these facts:

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