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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/94578

94578

ZIP 94578 is in San Leandro, California, in Alameda County; area codes 510 and 341; Pacific time. San Leandro has 3 ZIP codes; the others are 94577 and 94579.

Type
Standard
Time zone
America/Los_Angeles
County
Alameda
Population
41,769
Coordinates
37.7068, -122.1256
☼ Live from 94578 — San Leandro, CA

Weather right now

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Local time: —

Where 94578 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 94578
  • 🔢 Type 94578 into a pocket calculator and turn it upside down: BLShG — not quite a word, sorry.
  • ➕ As a number, 94,578 = 2 × 3 × 11 × 1433. Its digits add up to 33, a total 456 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000101110010
  • 🏠 Its numerical neighbours: 94577 (San Leandro, CA, 2 mi away) and 94579 (San Leandro, CA, 2 mi away).
  • 🔄 Backwards, 94578 becomes 87549 — and that is a real ZIP code: Ojo Caliente, NM, 896 miles away.
  • 👥 36 other ZIP codes are made of exactly the same digits (45789, 45879, 45897, 47598, 47859, 47958, …). The farthest-flung twin is 45789 in Wingett Run, OH, 2,191 miles away.
  • 🧭 Farther south than 60% of all ZIP codes, and farther west than 96%.
  • 🎯1,273 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94578 and you would come out at 37.71°S, 57.87°E — 1,012 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 4.6 square miles of land, 94578 is bigger than 18% of ZIP codes — room for about 3.5 Central Parks.
🌙 The sky over 94578 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population41,769This ZIP41,769
Households13,904This ZIP13,904
Housing units14,672This ZIP14,672
Median age37.9This ZIP37.9California37.9US 38.9
Median household income$94,084This ZIP$94,084California$99,122US $80,734
Median home value$823,000This ZIP$823,000California$734,700US $332,700
Median gross rent$2,116This ZIP$2,116California$2,036US $1,413
Bachelor's degree or higher25.8%This ZIP25.8%
Mean commute31.8 minThis ZIP31.8 min
Population density9,161.9 / sq miThis ZIP9,161.9 / sq mi

Business and tax activity

Business establishments606This ZIP606
Employees10,428This ZIP10,428
Annual payroll$731,658,000This ZIP$731,658,000
Tax returns filed18,650This ZIP18,650
Total adjusted gross income$1,305,447,000This ZIP$1,305,447,000

Land area

Land area4.56 sq miThis ZIP4.56 sq mi
Water area0.00 sq mi

Other place names in 94578

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

ZIP codes near 94578

ZIPCityDistance
94580 San Lorenzo, CA 2.0 mi
94579 San Leandro, CA 2.2 mi
94577 San Leandro, CA 2.5 mi
94546 Castro Valley, CA 2.9 mi
94541 Hayward, CA 3.1 mi
94603 Oakland, CA 3.5 mi
94543 Hayward, CA 3.6 mi
94605 Oakland, CA 4.0 mi
94614 Oakland, CA 4.6 mi
94545 Hayward, CA 5.3 mi

Find every ZIP code within 10 miles of 94578 →

Questions about this ZIP code

Where is ZIP code 94578?

94578 is in San Leandro, California, in Alameda County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.7068, -122.1256.

What county is 94578 in?

94578 lies in Alameda County.

What area code is 94578?

San Leandro uses area codes 510 and 341, from NANPA's telephone records.

What time zone is 94578 in?

94578 uses America/Los_Angeles.

How many people live in 94578?

About 41,769 people live in ZIP code 94578, in 13,904 households, at 9,161.9 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 94578?

$94,084 a year, against $99,122 across California.

What ZIP codes are near 94578?

The closest are 94580 (2 mi), 94579 (2.2 mi), 94577 (2.5 mi), 94546 (2.9 mi) and 94541 (3.1 mi).

Is 94578 a PO Box ZIP code?

94578 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94578 ZIP Code — San Leandro, California (Alameda County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94578

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