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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/92121

92121

ZIP 92121 is in San Diego, California, in San Diego County; area codes 619 and 858; Pacific time. San Diego has 76 ZIP codes in all.

Type
Standard
Time zone
America/Los_Angeles
County
San Diego
Population
3,974
Coordinates
32.8971, -117.2016
☼ Live from 92121 — San Diego, CA

Weather right now

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NEXRAD radar
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Local time: —

Where 92121 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 92121
  • 🔢 Type 92121 into a pocket calculator and turn it upside down: IZIZG — not quite a word, sorry.
  • ➕ As a number, 92,121 = 3 × 30707. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011111011001
  • 🏠 Its numerical neighbours: 92120 (San Diego, CA, 10 mi away) and 92122 (San Diego, CA, 3 mi away).
  • 🔄 Backwards, 92121 becomes 12129, which is not a ZIP code at all.
  • 👥 16 other ZIP codes are made of exactly the same digits (11229, 12192, 12912, 12921, 19122, 21219, …). The farthest-flung twin is 12921 in Chazy, NY, 2,461 miles away.
  • 🧭 Farther south than 84% of all ZIP codes, and farther west than 90%.
  • 🎯1,138 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 92121 and you would come out at 32.90°S, 62.80°E — 938 miles from Port Louis, Mauritius, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 19m of daylight. Shortest: 9h 59m.
  • 📏 At 12.5 square miles of land, 92121 is bigger than 30% of ZIP codes — room for about 9.5 Central Parks.
🌙 The sky over 92121 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population3,974This ZIP3,974
Households1,575This ZIP1,575
Housing units1,702This ZIP1,702
Median age32.7This ZIP32.7California37.9US 38.9
Median household income$135,938This ZIP$135,938California$99,122US $80,734
Median home value$1,085,200This ZIP$1,085,200California$734,700US $332,700
Median gross rent$2,606This ZIP$2,606California$2,036US $1,413
Bachelor's degree or higher74.4%This ZIP74.4%
Mean commute18.1 minThis ZIP18.1 min
Population density316.9 / sq miThis ZIP316.9 / sq mi

Business and tax activity

Business establishments2,907This ZIP2,907
Employees123,633This ZIP123,633
Annual payroll$18,556,501,000This ZIP$18,556,501,000
Tax returns filed2,400This ZIP2,400
Total adjusted gross income$472,098,000This ZIP$472,098,000

Land area

Land area12.54 sq miThis ZIP12.54 sq mi
Water area0.02 sq miThis ZIP0.02 sq mi

Other place names in 92121

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

ZIP codes near 92121

ZIPCityDistance
92093 La Jolla, CA 2.3 mi
92161 San Diego, CA 2.4 mi
92092 La Jolla, CA 2.5 mi
92122 San Diego, CA 2.8 mi
92130 San Diego, CA 3.5 mi
92126 San Diego, CA 3.5 mi
92145 San Diego, CA 3.9 mi
92037 La Jolla, CA 4.1 mi
92117 San Diego, CA 5.0 mi
92014 Del Mar, CA 5.4 mi

Find every ZIP code within 10 miles of 92121 →

Questions about this ZIP code

Where is ZIP code 92121?

92121 is in San Diego, California, in San Diego County, part of the San Diego-Chula Vista-Carlsbad, CA metropolitan area. Its published point location is 32.8971, -117.2016.

What county is 92121 in?

92121 lies in San Diego County.

What area code is 92121?

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

What time zone is 92121 in?

92121 uses America/Los_Angeles.

How many people live in 92121?

About 3,974 people live in ZIP code 92121, in 1,575 households, at 316.9 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 92121?

$135,938 a year, against $99,122 across California.

What ZIP codes are near 92121?

The closest are 92093 (2.3 mi), 92161 (2.4 mi), 92092 (2.5 mi), 92122 (2.8 mi) and 92130 (3.5 mi).

Is 92121 a PO Box ZIP code?

92121 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “92121 ZIP Code — San Diego, California (San Diego County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/92121

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