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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/94402

94402

ZIP 94402 is in San Mateo, California, in San Mateo County; area code 650; Pacific time. San Mateo has 5 ZIP codes; the others are 94401, 94403, 94404 and 94497.

Type
Standard
Time zone
America/Los_Angeles
County
San Mateo
Population
25,475
Coordinates
37.5401, -122.3301
☼ Live from 94402 — San Mateo, CA

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Local time: —

Where 94402 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 94402
  • 🔢 Type 94402 into a pocket calculator and turn it upside down: ZOhhG — not quite a word, sorry.
  • ➕ As a number, 94,402 = 2 × 7 × 11 × 613. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000011000010
  • 🏠 Its numerical neighbours: 94401 (San Mateo, CA, 2 mi away) and 94403 (San Mateo, CA, 1 mi away).
  • 🔄 Backwards, 94402 becomes 20449, which is not a ZIP code at all.
  • 👥 27 other ZIP codes are made of exactly the same digits (02494, 04294, 04429, 04492, 04924, 04942, …). The farthest-flung twin is 09244 in APO AE, a military post office, 5,738 miles away.
  • 🧭 Farther south than 61% of all ZIP codes, and farther west than 96%.
  • 🎯1,287 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94402 and you would come out at 37.54°S, 57.67°E — 1,028 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 45m of daylight. Shortest: 9h 34m.
  • 📏 At 5.1 square miles of land, 94402 is bigger than 19% of ZIP codes — room for about 3.8 Central Parks.
🌙 The sky over 94402 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population25,475This ZIP25,475
Households10,125This ZIP10,125
Housing units10,764This ZIP10,764
Median age40.8This ZIP40.8California37.9US 38.9
Median household income$172,522This ZIP$172,522California$99,122US $80,734
Median home value$2,000,000+This ZIP$2,000,000+California$734,700US $332,700
Median gross rent$3,500+This ZIP$3,500+California$2,036US $1,413
Bachelor's degree or higher68.6%This ZIP68.6%
Mean commute26.2 minThis ZIP26.2 min
Population density5,044.6 / sq miThis ZIP5,044.6 / sq mi

Business and tax activity

Business establishments1,024This ZIP1,024
Employees24,824This ZIP24,824
Annual payroll$4,339,223,000This ZIP$4,339,223,000
Tax returns filed13,370This ZIP13,370
Total adjusted gross income$4,593,874,000This ZIP$4,593,874,000

Land area

Land area5.05 sq miThis ZIP5.05 sq mi
Water area0.00 sq mi

Other place names in 94402

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

ZIP codes near 94402

ZIPCityDistance
94497 San Mateo, CA 0.4 mi
94403 San Mateo, CA 1.4 mi
94401 San Mateo, CA 2.5 mi
94002 Belmont, CA 2.6 mi
94010 Burlingame, CA 3.3 mi
94404 San Mateo, CA 3.6 mi
94011 Burlingame, CA 3.6 mi
94070 San Carlos, CA 4.4 mi
94065 Redwood City, CA 4.4 mi
94030 Millbrae, CA 5.7 mi

Find every ZIP code within 10 miles of 94402 →

Questions about this ZIP code

Where is ZIP code 94402?

94402 is in San Mateo, California, in San Mateo County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.5401, -122.3301.

What county is 94402 in?

94402 lies in San Mateo County.

What area code is 94402?

San Mateo uses area code 650, from NANPA's telephone records.

What time zone is 94402 in?

94402 uses America/Los_Angeles.

How many people live in 94402?

About 25,475 people live in ZIP code 94402, in 10,125 households, at 5,044.6 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 94402?

$172,522 a year, against $99,122 across California.

What ZIP codes are near 94402?

The closest are 94497 (0.4 mi), 94403 (1.4 mi), 94401 (2.5 mi), 94002 (2.6 mi) and 94010 (3.3 mi).

Is 94402 a PO Box ZIP code?

94402 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94402 ZIP Code — San Mateo, California (San Mateo County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94402

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