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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/94404

94404

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

Type
Standard
Time zone
America/Los_Angeles
County
San Mateo
Population
35,881
Coordinates
37.5560, -122.2677
☼ Live from 94404 — San Mateo, CA

Weather right now

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Local time: —

Where 94404 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 94404
  • 🔢 Type 94404 into a pocket calculator and turn it upside down: hOhhG — not quite a word, sorry.
  • ➕ As a number, 94,404 = 2 × 2 × 3 × 7867. Its digits add up to 21, a total 2,594 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000011000100
  • 🏠 Its numerical neighbours: 94403 (San Mateo, CA, 2 mi away) and 94497 (San Mateo, CA, 4 mi away).
  • 🔄 Backwards, 94404 becomes 40449, which is not a ZIP code at all.
  • 👥 10 other ZIP codes are made of exactly the same digits (04449, 04944, 40944, 44049, 44094, 44490, …). The farthest-flung twin is 04449 in Hudson, ME, 2,768 miles away.
  • 🧭 Farther south than 61% of all ZIP codes, and farther west than 96%.
  • 🎯1,283 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94404 and you would come out at 37.56°S, 57.73°E — 1,025 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 34m.
  • 📏 At 4.4 square miles of land, 94404 is bigger than 18% of ZIP codes — room for about 3.3 Central Parks.
🌙 The sky over 94404 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population35,881This ZIP35,881
Households14,717This ZIP14,717
Housing units15,350This ZIP15,350
Median age39.8This ZIP39.8California37.9US 38.9
Median household income$192,332This ZIP$192,332California$99,122US $80,734
Median home value$1,714,400This ZIP$1,714,400California$734,700US $332,700
Median gross rent$3,500+This ZIP$3,500+California$2,036US $1,413
Bachelor's degree or higher74.3%This ZIP74.3%
Mean commute29.0 minThis ZIP29.0 min
Population density8,248.5 / sq miThis ZIP8,248.5 / sq mi

Business and tax activity

Business establishments911This ZIP911
Employees26,284This ZIP26,284
Annual payroll$5,858,700,000This ZIP$5,858,700,000
Tax returns filed17,540This ZIP17,540
Total adjusted gross income$3,932,052,000This ZIP$3,932,052,000

Land area

Land area4.35 sq miThis ZIP4.35 sq mi
Water area0.58 sq miThis ZIP0.58 sq mi

Other place names in 94404

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

ZIP codes near 94404

ZIPCityDistance
94065 Redwood City, CA 1.8 mi
94403 San Mateo, CA 2.4 mi
94401 San Mateo, CA 3.2 mi
94002 Belmont, CA 3.3 mi
94497 San Mateo, CA 3.5 mi
94402 San Mateo, CA 3.6 mi
94070 San Carlos, CA 4.1 mi
94011 Burlingame, CA 5.7 mi
94063 Redwood City, CA 5.9 mi
94010 Burlingame, CA 6.0 mi

Find every ZIP code within 10 miles of 94404 →

Questions about this ZIP code

Where is ZIP code 94404?

94404 is in San Mateo, California, in San Mateo County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.5560, -122.2677.

What county is 94404 in?

94404 lies in San Mateo County.

What area code is 94404?

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

What time zone is 94404 in?

94404 uses America/Los_Angeles.

How many people live in 94404?

About 35,881 people live in ZIP code 94404, in 14,717 households, at 8,248.5 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 94404?

$192,332 a year, against $99,122 across California.

What ZIP codes are near 94404?

The closest are 94065 (1.8 mi), 94403 (2.4 mi), 94401 (3.2 mi), 94002 (3.3 mi) and 94497 (3.5 mi).

Is 94404 a PO Box ZIP code?

94404 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94404 ZIP Code — San Mateo, California (San Mateo County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94404

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