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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/94551

94551

ZIP 94551 is in Livermore, California, mostly in Alameda County; area code 925; Pacific time. Livermore has 2 ZIP codes; the other is 94550.

Type
Standard
Time zone
America/Los_Angeles
County
Alameda +1 more
Population
37,885
Coordinates
37.7505, -121.7492
☼ Live from 94551 — Livermore, CA

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Where 94551 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 94551
  • 🔢 Type 94551 into a pocket calculator and turn it upside down: ISShG — not quite a word, sorry.
  • ➕ As a number, 94,551 = 3 × 31517. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000101010111
  • 🏠 Its numerical neighbours: 94550 (Livermore, CA, 19 mi away) and 94552 (Castro Valley, CA, 14 mi away).
  • 🔄 Backwards, 94551 becomes 15549 — and that is a real ZIP code: Listie, PA, 2,282 miles away.
  • 👥 24 other ZIP codes are made of exactly the same digits (14559, 15459, 15549, 15945, 15954, 19455, …). The farthest-flung twin is 19455 in North Wales, PA, 2,473 miles away.
  • 🧭 Farther south than 60% of all ZIP codes, and farther west than 95%.
  • 🎯1,252 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94551 and you would come out at 37.75°S, 58.25°E — 998 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 82.7 square miles of land, 94551 is bigger than 73% of ZIP codes — room for about 63 Central Parks.
🌙 The sky over 94551 today
  • Working out the sun…
🌋 Shake report
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Source: USGS.

People and housing

Population37,885This ZIP37,885
Households14,052This ZIP14,052
Housing units14,290This ZIP14,290
Median age39.7This ZIP39.7California37.9US 38.9
Median household income$145,392This ZIP$145,392California$99,122US $80,734
Median home value$978,500This ZIP$978,500California$734,700US $332,700
Median gross rent$2,696This ZIP$2,696California$2,036US $1,413
Bachelor's degree or higher48.1%This ZIP48.1%
Mean commute31.5 minThis ZIP31.5 min
Population density457.9 / sq miThis ZIP457.9 / sq mi

Business and tax activity

Business establishments1,362This ZIP1,362
Employees30,354This ZIP30,354
Annual payroll$2,474,024,000This ZIP$2,474,024,000
Tax returns filed19,940This ZIP19,940
Total adjusted gross income$2,584,756,000This ZIP$2,584,756,000

Land area

Land area82.74 sq miThis ZIP82.74 sq mi
Water area0.34 sq miThis ZIP0.34 sq mi

Counties 94551 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Alameda County 63.0%
Contra Costa County 37.0%

Other place names in 94551

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

ZIP codes near 94551

ZIPCityDistance
94588 Pleasanton, CA 6.9 mi
94514 Byron, CA 8.1 mi
95391 Tracy, CA 8.5 mi
94568 Dublin, CA 8.6 mi
94566 Pleasanton, CA 8.9 mi
94582 San Ramon, CA 9.1 mi
94506 Danville, CA 9.2 mi
94537 Fremont, CA 10.6 mi
94540 Hayward, CA 10.6 mi
94557 Hayward, CA 10.6 mi

Find every ZIP code within 10 miles of 94551 →

Questions about this ZIP code

Where is ZIP code 94551?

94551 is in Livermore, California, in Alameda County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.7505, -121.7492.

What county is 94551 in?

94551 spans 2 counties: Alameda County and Contra Costa County. Most of it falls in Alameda County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.

What area code is 94551?

Livermore uses area code 925, from NANPA's telephone records.

What time zone is 94551 in?

94551 uses America/Los_Angeles.

How many people live in 94551?

About 37,885 people live in ZIP code 94551, in 14,052 households, at 457.9 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 94551?

$145,392 a year, against $99,122 across California.

What ZIP codes are near 94551?

The closest are 94588 (6.9 mi), 94514 (8.1 mi), 95391 (8.5 mi), 94568 (8.6 mi) and 94566 (8.9 mi).

Is 94551 a PO Box ZIP code?

94551 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94551 ZIP Code — Livermore, California (Alameda County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94551

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