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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/94621

94621

ZIP 94621 is in Oakland, California, in Alameda County; area codes 510 and 341; Pacific time. Oakland has 26 ZIP codes in all.

Type
Standard
Time zone
America/Los_Angeles
County
Alameda
Population
33,840
Coordinates
37.7511, -122.2102
☼ Live from 94621 — Oakland, CA

Weather right now

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Local time: —

Where 94621 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 94621
  • 🔢 Type 94621 into a pocket calculator and turn it upside down: IZghG — not quite a word, sorry.
  • ➕ 94621 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 22, a total 2,607 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000110011101
  • 🏠 Its numerical neighbours: 94620 (Piedmont, CA, 5 mi away) and 94622 (Oakland, CA, 4 mi away).
  • 🔄 Backwards, 94621 becomes 12649, which is not a ZIP code at all.
  • 👥 46 other ZIP codes are made of exactly the same digits (12469, 12496, 12946, 12964, 14269, 14692, …). The farthest-flung twin is 96214 in APO AA, a military post office, 5,647 miles away.
  • 🧭 Farther south than 60% 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 94621 and you would come out at 37.75°S, 57.79°E — 1,012 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 8.5 square miles of land, 94621 is bigger than 25% of ZIP codes — room for about 6.5 Central Parks.
🌙 The sky over 94621 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population33,840This ZIP33,840
Households10,359This ZIP10,359
Housing units11,063This ZIP11,063
Median age33.3This ZIP33.3California37.9US 38.9
Median household income$52,049This ZIP$52,049California$99,122US $80,734
Median home value$543,700This ZIP$543,700California$734,700US $332,700
Median gross rent$1,551This ZIP$1,551California$2,036US $1,413
Bachelor's degree or higher13.5%This ZIP13.5%
Mean commute27.9 minThis ZIP27.9 min
Population density3,974.6 / sq miThis ZIP3,974.6 / sq mi

Business and tax activity

Business establishments817This ZIP817
Employees26,435This ZIP26,435
Annual payroll$2,024,331,000This ZIP$2,024,331,000
Tax returns filed13,500This ZIP13,500
Total adjusted gross income$663,323,000This ZIP$663,323,000

Land area

Land area8.51 sq miThis ZIP8.51 sq mi
Water area1.80 sq miThis ZIP1.80 sq mi

Other place names in 94621

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

ZIP codes near 94621

ZIPCityDistance
94614 Oakland, CA 1.6 mi
94601 Oakland, CA 1.8 mi
94502 Alameda, CA 1.8 mi
94603 Oakland, CA 2.1 mi
94613 Oakland, CA 2.5 mi
94577 San Leandro, CA 3.3 mi
94605 Oakland, CA 3.4 mi
94606 Oakland, CA 3.4 mi
94622 Oakland, CA 3.5 mi
94602 Oakland, CA 3.8 mi

Find every ZIP code within 10 miles of 94621 →

Questions about this ZIP code

Where is ZIP code 94621?

94621 is in Oakland, California, in Alameda County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.7511, -122.2102.

What county is 94621 in?

94621 lies in Alameda County.

What area code is 94621?

Oakland uses area codes 510 and 341, from NANPA's telephone records.

What time zone is 94621 in?

94621 uses America/Los_Angeles.

How many people live in 94621?

About 33,840 people live in ZIP code 94621, in 10,359 households, at 3,974.6 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 94621?

$52,049 a year, against $99,122 across California.

What ZIP codes are near 94621?

The closest are 94614 (1.6 mi), 94601 (1.8 mi), 94502 (1.8 mi), 94603 (2.1 mi) and 94613 (2.5 mi).

Is 94621 a PO Box ZIP code?

94621 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94621 ZIP Code — Oakland, California (Alameda County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94621

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