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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/94546

94546

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

Type
Standard
Time zone
America/Los_Angeles
County
Alameda
Population
44,855
Coordinates
37.7454, -122.1031
☼ Live from 94546 — Castro Valley, CA

Weather right now

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Local time: —

Where 94546 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 94546
  • 🔢 Type 94546 into a pocket calculator and turn it upside down: ghShG — not quite a word, sorry.
  • ➕ As a number, 94,546 = 2 × 41 × 1153. Its digits add up to 28, a total 1,520 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000101010010
  • 🏠 Its numerical neighbours: 94545 (Hayward, CA, 8 mi away) and 94547 (Hercules, CA, 20 mi away).
  • 🔄 Backwards, 94546 becomes 64549, which is not a ZIP code at all.
  • 👥 26 other ZIP codes are made of exactly the same digits (44659, 44695, 45469, 45694, 46945, 49456, …). The farthest-flung twin is 96454 in FPO AA, a military post office, 7,008 miles away.
  • 🧭 Farther south than 60% of all ZIP codes, and farther west than 96%.
  • 🎯1,271 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94546 and you would come out at 37.75°S, 57.90°E — 1,009 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 47m of daylight. Shortest: 9h 33m.
  • 📏 At 16.0 square miles of land, 94546 is bigger than 34% of ZIP codes — room for about 12 Central Parks.
🌙 The sky over 94546 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population44,855This ZIP44,855
Households15,565This ZIP15,565
Housing units16,233This ZIP16,233
Median age41.7This ZIP41.7California37.9US 38.9
Median household income$128,385This ZIP$128,385California$99,122US $80,734
Median home value$1,043,500This ZIP$1,043,500California$734,700US $332,700
Median gross rent$2,539This ZIP$2,539California$2,036US $1,413
Bachelor's degree or higher41.7%This ZIP41.7%
Mean commute31.9 minThis ZIP31.9 min
Population density2,811.0 / sq miThis ZIP2,811.0 / sq mi

Business and tax activity

Business establishments923This ZIP923
Employees8,763This ZIP8,763
Annual payroll$528,033,000This ZIP$528,033,000
Tax returns filed22,090This ZIP22,090
Total adjusted gross income$2,634,068,000This ZIP$2,634,068,000

Land area

Land area15.96 sq miThis ZIP15.96 sq mi
Water area1.53 sq miThis ZIP1.53 sq mi

Other place names in 94546

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

ZIP codes near 94546

ZIPCityDistance
94605 Oakland, CA 2.8 mi
94578 San Leandro, CA 2.9 mi
94603 Oakland, CA 4.0 mi
94577 San Leandro, CA 4.1 mi
94619 Oakland, CA 4.5 mi
94580 San Lorenzo, CA 4.9 mi
94613 Oakland, CA 5.0 mi
94541 Hayward, CA 5.0 mi
94579 San Leandro, CA 5.0 mi
94543 Hayward, CA 5.4 mi

Find every ZIP code within 10 miles of 94546 →

Questions about this ZIP code

Where is ZIP code 94546?

94546 is in Castro Valley, California, in Alameda County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.7454, -122.1031.

What county is 94546 in?

94546 lies in Alameda County.

What time zone is 94546 in?

94546 uses America/Los_Angeles.

How many people live in 94546?

About 44,855 people live in ZIP code 94546, in 15,565 households, at 2,811.0 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 94546?

$128,385 a year, against $99,122 across California.

What ZIP codes are near 94546?

The closest are 94605 (2.8 mi), 94578 (2.9 mi), 94603 (4 mi), 94577 (4.1 mi) and 94619 (4.5 mi).

Is 94546 a PO Box ZIP code?

94546 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94546 ZIP Code — Castro Valley, California (Alameda County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94546

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