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/91963

91963

ZIP 91963 is Potrero, California, in San Diego County; area codes 619 and 858; Pacific time.

Type
Standard
Time zone
America/Los_Angeles
County
San Diego
Population
689
Coordinates
32.6480, -116.5964
☼ Live from 91963 — Potrero, CA

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Local time: —

Where 91963 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 91963
  • 🔢 Type 91963 into a pocket calculator and turn it upside down: EgGIG — not quite a word, sorry.
  • ➕ As a number, 91,963 = 41 × 2243. Its digits add up to 28, a total 1,520 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011100111011
  • 🏠 Its numerical neighbours: 91962 (Pine Valley, CA, 14 mi away) and 91976 (Spring Valley, CA, 24 mi away).
  • 🔄 Backwards, 91963 becomes 36919 — and that is a real ZIP code: Silas, AL, 1,651 miles away.
  • 👥 19 other ZIP codes are made of exactly the same digits (13699, 16939, 19369, 19936, 19963, 31699, …). The farthest-flung twin is 96931 in Tamuning, GU, 6,208 miles away.
  • 🧭 Farther south than 86% of all ZIP codes, and farther west than 89%.
  • 🎯1,117 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91963 and you would come out at 32.65°S, 63.40°E — 936 miles from Port Louis, Mauritius, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 18m of daylight. Shortest: 10h 00m.
  • 📏 At 41.2 square miles of land, 91963 is bigger than 54% of ZIP codes — room for about 31 Central Parks.
🌙 The sky over 91963 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population689This ZIP689
Households197This ZIP197
Housing units197This ZIP197
Median age16.6This ZIP16.6California37.9US 38.9
Bachelor's degree or higher14.0%This ZIP14.0%
Population density16.7 / sq miThis ZIP16.7 / sq mi

Business and tax activity

Business establishments9This ZIP9
Employees26This ZIP26
Annual payroll$1,129,000This ZIP$1,129,000
Tax returns filed720This ZIP720
Total adjusted gross income$33,244,000This ZIP$33,244,000

Land area

Land area41.25 sq miThis ZIP41.25 sq mi
Water area0.00 sq mi

Other place names in 91963

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

ZIP codes near 91963

ZIPCityDistance
91980 Tecate, CA 4.8 mi
91987 Tecate, CA 5.2 mi
91906 Campo, CA 7.0 mi
91917 Dulzura, CA 9.2 mi
91935 Jamul, CA 10.9 mi
91931 Guatay, CA 13.1 mi
91901 Alpine, CA 13.7 mi
91962 Pine Valley, CA 14.4 mi
91903 Alpine, CA 16.3 mi
91948 Mount Laguna, CA 16.6 mi

Find every ZIP code within 10 miles of 91963 →

Questions about this ZIP code

Where is ZIP code 91963?

91963 is in Potrero, California, in San Diego County, part of the San Diego-Chula Vista-Carlsbad, CA metropolitan area. Its published point location is 32.6480, -116.5964.

What county is 91963 in?

91963 lies in San Diego County.

What area code is 91963?

Potrero uses area codes 619 and 858, from NANPA's telephone records.

What time zone is 91963 in?

91963 uses America/Los_Angeles.

How many people live in 91963?

About 689 people live in ZIP code 91963, in 197 households, at 16.7 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What ZIP codes are near 91963?

The closest are 91980 (4.8 mi), 91987 (5.2 mi), 91906 (7 mi), 91917 (9.2 mi) and 91935 (10.9 mi).

Is 91963 a PO Box ZIP code?

91963 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “91963 ZIP Code — Potrero, California (San Diego County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91963

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