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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/94588

94588

ZIP 94588 is in Pleasanton, California, mostly in Alameda County; area code 925; Pacific time. Pleasanton has 2 ZIP codes; the other is 94566.

Type
Standard
Time zone
America/Los_Angeles
County
Alameda +1 more
Population
34,328
Coordinates
37.7926, -121.8628
☼ Live from 94588 — Pleasanton, CA

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Local time: —

Where 94588 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 94588
  • 🔢 Type 94588 into a pocket calculator and turn it upside down: BBShG — not quite a word, sorry.
  • ➕ As a number, 94,588 = 2 × 2 × 13 × 17 × 107. Its digits add up to 34, a total 322 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000101111100
  • 🏠 Its numerical neighbours: 94587 (Union City, CA, 18 mi away) and 94589 (Vallejo, CA, 32 mi away).
  • 🔄 Backwards, 94588 becomes 88549 — and that is a real ZIP code: El Paso, TX, 977 miles away.
  • 👥 15 other ZIP codes are made of exactly the same digits (45889, 45898, 48859, 48895, 49588, 49858, …). The farthest-flung twin is 45889 in Van Buren, OH, 2,035 miles away.
  • 🧭 Farther south than 59% of all ZIP codes, and farther west than 95%.
  • 🎯1,258 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94588 and you would come out at 37.79°S, 58.14°E — 999 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 32.7 square miles of land, 94588 is bigger than 48% of ZIP codes — room for about 25 Central Parks.
🌙 The sky over 94588 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population34,328This ZIP34,328
Households12,465This ZIP12,465
Housing units12,797This ZIP12,797
Median age41.3This ZIP41.3California37.9US 38.9
Median household income$191,073This ZIP$191,073California$99,122US $80,734
Median home value$1,384,300This ZIP$1,384,300California$734,700US $332,700
Median gross rent$3,317This ZIP$3,317California$2,036US $1,413
Bachelor's degree or higher70.9%This ZIP70.9%
Mean commute36.1 minThis ZIP36.1 min
Population density1,048.5 / sq miThis ZIP1,048.5 / sq mi

Business and tax activity

Business establishments1,806This ZIP1,806
Employees61,022This ZIP61,022
Annual payroll$9,476,591,000This ZIP$9,476,591,000
Tax returns filed15,840This ZIP15,840
Total adjusted gross income$3,451,508,000This ZIP$3,451,508,000

Land area

Land area32.74 sq miThis ZIP32.74 sq mi
Water area0.40 sq miThis ZIP0.40 sq mi

Counties 94588 spans

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

CountyShare of this ZIP
Alameda County 50.9%
Contra Costa County 49.1%

Other place names in 94588

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

ZIP codes near 94588

ZIPCityDistance
94506 Danville, CA 2.4 mi
94582 San Ramon, CA 3.4 mi
94570 Moraga, CA 5.2 mi
94568 Dublin, CA 5.7 mi
94528 Diablo, CA 6.2 mi
94526 Danville, CA 6.8 mi
94551 Livermore, CA 6.9 mi
94517 Clayton, CA 7.0 mi
94583 San Ramon, CA 7.1 mi
94537 Fremont, CA 8.4 mi

Find every ZIP code within 10 miles of 94588 →

Questions about this ZIP code

Where is ZIP code 94588?

94588 is in Pleasanton, California, in Alameda County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.7926, -121.8628.

What county is 94588 in?

94588 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 94588?

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

What time zone is 94588 in?

94588 uses America/Los_Angeles.

How many people live in 94588?

About 34,328 people live in ZIP code 94588, in 12,465 households, at 1,048.5 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 94588?

$191,073 a year, against $99,122 across California.

What ZIP codes are near 94588?

The closest are 94506 (2.4 mi), 94582 (3.4 mi), 94570 (5.2 mi), 94568 (5.7 mi) and 94528 (6.2 mi).

Is 94588 a PO Box ZIP code?

94588 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94588 ZIP Code — Pleasanton, California (Alameda County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94588

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