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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/91331

91331

ZIP 91331 is in Pacoima, California, in Los Angeles County; area codes 818 and 747; Pacific time. Pacoima has 3 ZIP codes; the others are 91333 and 91334.

Type
Standard
Time zone
America/Los_Angeles
County
Los Angeles
Population
97,608
Coordinates
34.2553, -118.4197
☼ Live from 91331 — Pacoima, CA

Weather right now

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Local time: —

Where 91331 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 91331
  • 🔢 Type 91331 into a pocket calculator and turn it upside down: IEEIG — not quite a word, sorry.
  • ➕ 91331 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 17, a total 2,133 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110010011000011
  • 🏠 Its numerical neighbours: 91330 (Northridge, CA, 6 mi away) and 91333 (Pacoima, CA, 1 mi away).
  • 🔄 Backwards, 91331 becomes 13319 — and that is a real ZIP code: Chadwicks, NY, 2,378 miles away.
  • 👥 14 other ZIP codes are made of exactly the same digits (11933, 13139, 13319, 19133, 19331, 31139, …). The farthest-flung twin is 11933 in Calverton, NY, 2,513 miles away.
  • 🧭 Farther south than 77% of all ZIP codes, and farther west than 92%.
  • 🎯1,157 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91331 and you would come out at 34.26°S, 61.58°E — 997 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 27m of daylight. Shortest: 9h 52m.
  • 📏 At 9.3 square miles of land, 91331 is bigger than 26% of ZIP codes — room for about 7.1 Central Parks.
🌙 The sky over 91331 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population97,608This ZIP97,608
Households23,227This ZIP23,227
Housing units24,025This ZIP24,025
Median age35.4This ZIP35.4California37.9US 38.9
Median household income$84,227This ZIP$84,227California$99,122US $80,734
Median home value$633,200This ZIP$633,200California$734,700US $332,700
Median gross rent$1,844This ZIP$1,844California$2,036US $1,413
Bachelor's degree or higher11.0%This ZIP11.0%
Mean commute30.8 minThis ZIP30.8 min
Population density10,444.9 / sq miThis ZIP10,444.9 / sq mi

Business and tax activity

Business establishments1,068This ZIP1,068
Employees12,975This ZIP12,975
Annual payroll$674,376,000This ZIP$674,376,000
Tax returns filed44,100This ZIP44,100
Total adjusted gross income$2,078,736,000This ZIP$2,078,736,000

Land area

Land area9.35 sq miThis ZIP9.35 sq mi
Water area0.04 sq miThis ZIP0.04 sq mi

Other place names in 91331

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

ZIP codes near 91331

ZIPCityDistance
91333 Pacoima, CA 0.6 mi
91334 Pacoima, CA 0.6 mi
91341 San Fernando, CA 2.1 mi
91345 Mission Hills, CA 2.2 mi
91340 San Fernando, CA 2.3 mi
91402 Panorama City, CA 2.7 mi
91346 Mission Hills, CA 2.7 mi
91395 Mission Hills, CA 2.7 mi
91412 Panorama City, CA 2.7 mi
91605 North Hollywood, CA 3.5 mi

Find every ZIP code within 10 miles of 91331 →

Questions about this ZIP code

Where is ZIP code 91331?

91331 is in Pacoima, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 34.2553, -118.4197.

What county is 91331 in?

91331 lies in Los Angeles County.

What area code is 91331?

Pacoima uses area codes 818 and 747, from NANPA's telephone records.

What time zone is 91331 in?

91331 uses America/Los_Angeles.

How many people live in 91331?

About 97,608 people live in ZIP code 91331, in 23,227 households, at 10,444.9 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 91331?

$84,227 a year, against $99,122 across California.

What ZIP codes are near 91331?

The closest are 91333 (0.6 mi), 91334 (0.6 mi), 91341 (2.1 mi), 91345 (2.2 mi) and 91340 (2.3 mi).

Is 91331 a PO Box ZIP code?

91331 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “91331 ZIP Code — Pacoima, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91331

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