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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/92331

92331

ZIP 92331 is in Fontana, California, in Imperial County; area codes 909 and 840; Pacific time. Fontana has 5 ZIP codes; the others are 92334, 92335, 92336 and 92337.

Type
No street area
Time zone
America/Los_Angeles
County
Imperial
Metro area
El Centro, CA
Coordinates
34.0922, -117.4612

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 92335, whose figures describe that area — not this ZIP code.

☼ Live from 92331 — Fontana, CA

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Where 92331 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 92331
  • 🔢 Type 92331 into a pocket calculator and turn it upside down: IEEZG — not quite a word, sorry.
  • ➕ As a number, 92,331 = 3 × 3 × 10259. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110100010101011
  • 🏠 Its numerical neighbours: 92329 (Phelan, CA, 24 mi away) and 92332 (Essex, CA, 132 mi away).
  • 🔄 Backwards, 92331 becomes 13329 — and that is a real ZIP code: Dolgeville, NY, 2,364 miles away.
  • 👥 16 other ZIP codes are made of exactly the same digits (12933, 13329, 23139, 29133, 29331, 31329, …). The farthest-flung twin is 12933 in Ellenburg, NY, 2,410 miles away.
  • 🧭 Farther south than 78% of all ZIP codes, and farther west than 90%.
  • 🎯1,113 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 92331 and you would come out at 34.09°S, 62.54°E — 1,010 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 26m of daylight. Shortest: 9h 53m.
🌙 The sky over 92331 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments10This ZIP10
Employees280This ZIP280
Annual payroll$8,936,000This ZIP$8,936,000

Land area

ZIP codes near 92331

ZIPCityDistance
92335 Fontana, CA 0.4 mi
92334 Fontana, CA 1.5 mi
92337 Fontana, CA 3.0 mi
92336 Fontana, CA 3.1 mi
92316 Bloomington, CA 4.7 mi
92376 Rialto, CA 4.8 mi
92377 Rialto, CA 5.3 mi
91739 Rancho Cucamonga, CA 5.5 mi
92509 Riverside, CA 6.2 mi
91730 Rancho Cucamonga, CA 6.9 mi

Find every ZIP code within 10 miles of 92331 →

Questions about this ZIP code

Where is ZIP code 92331?

92331 is in Fontana, California, in Imperial County, part of the El Centro, CA metropolitan area. Its published point location is 34.0922, -117.4612.

What county is 92331 in?

92331 lies in Imperial County.

What area code is 92331?

Fontana uses area codes 909 and 840, from NANPA's telephone records.

What time zone is 92331 in?

92331 uses America/Los_Angeles.

What ZIP codes are near 92331?

The closest are 92335 (0.4 mi), 92334 (1.5 mi), 92337 (3 mi), 92336 (3.1 mi) and 92316 (4.7 mi).

Is 92331 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “92331 ZIP Code — Fontana, California (Imperial County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/92331

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/92331.json

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