Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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/94303

94303

ZIP 94303 is in Palo Alto, California, mostly in Santa Clara County; area code 650; Pacific time. Palo Alto has 6 ZIP codes; the others are 94301, 94302, 94304, 94306 and 94309.

Type
Standard
Time zone
America/Los_Angeles
County
Santa Clara +1 more
Population
46,879
Coordinates
37.4579, -122.1151
☼ Live from 94303 — Palo Alto, CA

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Where 94303 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 94303
  • 🔢 Type 94303 into a pocket calculator and turn it upside down: EOEhG — not quite a word, sorry.
  • ➕ As a number, 94,303 = 11 × 8573. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000001011111
  • 🏠 Its numerical neighbours: 94302 (Palo Alto, CA, 2 mi away) and 94304 (Palo Alto, CA, 5 mi away).
  • 🔄 Backwards, 94303 becomes 30349 — and that is a real ZIP code: Atlanta, GA, 2,116 miles away.
  • 👥 22 other ZIP codes are made of exactly the same digits (04933, 30349, 30394, 30439, 33409, 33904, …). The farthest-flung twin is 34039 in APO AA, a military post office, 3,805 miles away.
  • 🧭 Farther south than 62% of all ZIP codes, and farther west than 96%.
  • 🎯1,277 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94303 and you would come out at 37.46°S, 57.88°E — 1,026 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 8.4 square miles of land, 94303 is bigger than 25% of ZIP codes — room for about 6.4 Central Parks.
🌙 The sky over 94303 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population46,879This ZIP46,879
Households14,466This ZIP14,466
Housing units15,891This ZIP15,891
Median age39.5This ZIP39.5California37.9US 38.9
Median household income$151,609This ZIP$151,609California$99,122US $80,734
Median home value$1,826,200This ZIP$1,826,200California$734,700US $332,700
Median gross rent$2,771This ZIP$2,771California$2,036US $1,413
Bachelor's degree or higher49.2%This ZIP49.2%
Mean commute23.0 minThis ZIP23.0 min
Population density5,555.0 / sq miThis ZIP5,555.0 / sq mi

Business and tax activity

Business establishments989This ZIP989
Employees17,648This ZIP17,648
Annual payroll$2,677,210,000This ZIP$2,677,210,000
Tax returns filed21,060This ZIP21,060
Total adjusted gross income$4,586,243,000This ZIP$4,586,243,000

Land area

Land area8.44 sq miThis ZIP8.44 sq mi
Water area0.15 sq miThis ZIP0.15 sq mi

Counties 94303 spans

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

CountyShare of this ZIP
Santa Clara County 67.1%
San Mateo County 32.9%

Other place names in 94303

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

ZIP codes near 94303

ZIPCityDistance
94302 Palo Alto, CA 1.9 mi
94309 Palo Alto, CA 1.9 mi
94301 Palo Alto, CA 2.1 mi
94306 Palo Alto, CA 3.0 mi
94025 Menlo Park, CA 3.7 mi
94043 Mountain View, CA 4.1 mi
94305 Stanford, CA 4.1 mi
94027 Atherton, CA 4.7 mi
94023 Los Altos, CA 5.0 mi
94063 Redwood City, CA 5.0 mi

Find every ZIP code within 10 miles of 94303 →

Questions about this ZIP code

Where is ZIP code 94303?

94303 is in Palo Alto, California, in Santa Clara County, part of the San Jose-Sunnyvale-Santa Clara, CA metropolitan area. Its published point location is 37.4579, -122.1151.

What county is 94303 in?

94303 spans 2 counties: Santa Clara County and San Mateo County. Most of it falls in Santa Clara 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 94303?

Palo Alto uses area code 650, from NANPA's telephone records.

What time zone is 94303 in?

94303 uses America/Los_Angeles.

How many people live in 94303?

About 46,879 people live in ZIP code 94303, in 14,466 households, at 5,555.0 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 94303?

$151,609 a year, against $99,122 across California.

What ZIP codes are near 94303?

The closest are 94302 (1.9 mi), 94309 (1.9 mi), 94301 (2.1 mi), 94306 (3 mi) and 94025 (3.7 mi).

Is 94303 a PO Box ZIP code?

94303 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94303 ZIP Code — Palo Alto, California (Santa Clara County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94303

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