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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/92021

92021

ZIP 92021 is in El Cajon, California, in San Diego County; area codes 619 and 858; Pacific time. El Cajon has 4 ZIP codes; the others are 92019, 92020 and 92022.

Type
Standard
Time zone
America/Los_Angeles
County
San Diego
Population
70,501
Coordinates
32.8357, -116.8746
☼ Live from 92021 — El Cajon, CA

Weather right now

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NEXRAD radar
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Local time: —

Where 92021 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 92021
  • 🔢 Type 92021 into a pocket calculator and turn it upside down: IZOZG — not quite a word, sorry.
  • ➕ As a number, 92,021 = 17 × 5413. Its digits add up to 14, a total 1,416 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011101110101
  • 🏠 Its numerical neighbours: 92020 (El Cajon, CA, 6 mi away) and 92022 (El Cajon, CA, 6 mi away).
  • 🔄 Backwards, 92021 becomes 12029 — and that is a real ZIP code: Canaan, NY, 2,439 miles away.
  • 👥 36 other ZIP codes are made of exactly the same digits (01229, 01922, 02129, 02912, 02921, 09212, …). The farthest-flung twin is 09212 in APO AE, a military post office, 5,816 miles away.
  • 🧭 Farther south than 85% of all ZIP codes, and farther west than 89%.
  • 🎯1,124 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 92021 and you would come out at 32.84°S, 63.13°E — 942 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 28.0 square miles of land, 92021 is bigger than 44% of ZIP codes — room for about 21 Central Parks.
🌙 The sky over 92021 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population70,501This ZIP70,501
Households22,953This ZIP22,953
Housing units23,734This ZIP23,734
Median age36.3This ZIP36.3California37.9US 38.9
Median household income$74,013This ZIP$74,013California$99,122US $80,734
Median home value$611,900This ZIP$611,900California$734,700US $332,700
Median gross rent$1,893This ZIP$1,893California$2,036US $1,413
Bachelor's degree or higher22.4%This ZIP22.4%
Mean commute25.8 minThis ZIP25.8 min
Population density2,514.4 / sq miThis ZIP2,514.4 / sq mi

Business and tax activity

Business establishments1,315This ZIP1,315
Employees12,986This ZIP12,986
Annual payroll$631,163,000This ZIP$631,163,000
Tax returns filed31,360This ZIP31,360
Total adjusted gross income$2,125,453,000This ZIP$2,125,453,000

Land area

Land area28.04 sq miThis ZIP28.04 sq mi
Water area0.18 sq miThis ZIP0.18 sq mi

Other place names in 92021

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

ZIP codes near 92021

ZIPCityDistance
92019 El Cajon, CA 3.9 mi
92040 Lakeside, CA 5.2 mi
92072 Santee, CA 5.8 mi
92022 El Cajon, CA 5.8 mi
92020 El Cajon, CA 6.2 mi
91903 Alpine, CA 6.3 mi
92071 Santee, CA 7.1 mi
91901 Alpine, CA 8.7 mi
91941 La Mesa, CA 8.9 mi
92119 San Diego, CA 9.2 mi

Find every ZIP code within 10 miles of 92021 →

Questions about this ZIP code

Where is ZIP code 92021?

92021 is in El Cajon, California, in San Diego County, part of the San Diego-Chula Vista-Carlsbad, CA metropolitan area. Its published point location is 32.8357, -116.8746.

What county is 92021 in?

92021 lies in San Diego County.

What area code is 92021?

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

What time zone is 92021 in?

92021 uses America/Los_Angeles.

How many people live in 92021?

About 70,501 people live in ZIP code 92021, in 22,953 households, at 2,514.4 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 92021?

$74,013 a year, against $99,122 across California.

What ZIP codes are near 92021?

The closest are 92019 (3.9 mi), 92040 (5.2 mi), 92072 (5.8 mi), 92022 (5.8 mi) and 92020 (6.2 mi).

Is 92021 a PO Box ZIP code?

92021 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “92021 ZIP Code — El Cajon, California (San Diego County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/92021

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/92021.json

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