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/91791

91791

ZIP 91791 is in West Covina, California, in Los Angeles County; area code 626; Pacific time. West Covina has 4 ZIP codes; the others are 91790, 91792 and 91793.

Type
Standard
Time zone
America/Los_Angeles
County
Los Angeles
Population
33,028
Coordinates
34.0616, -117.8922
☼ Live from 91791 — West Covina, CA

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 91791 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 91791
  • 🔢 Type 91791 into a pocket calculator and turn it upside down: IGLIG — not quite a word, sorry.
  • ➕ As a number, 91,791 = 3 × 3 × 7 × 31 × 47. Its digits add up to 27, a total 1,806 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011010001111
  • 🏠 Its numerical neighbours: 91790 (West Covina, CA, 3 mi away) and 91792 (West Covina, CA, 3 mi away).
  • 🔄 Backwards, 91791 becomes 19719, which is not a ZIP code at all.
  • 👥 11 other ZIP codes are made of exactly the same digits (19179, 19197, 19971, 79119, 79911, 91917, …). The farthest-flung twin is 99711 in Fairbanks, AK, 2,464 miles away.
  • 🧭 Farther south than 79% of all ZIP codes, and farther west than 91%.
  • 🎯1,136 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91791 and you would come out at 34.06°S, 62.11°E — 997 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 26m of daylight. Shortest: 9h 53m.
  • 📏 At 6.6 square miles of land, 91791 is bigger than 22% of ZIP codes — room for about 5.0 Central Parks.
🌙 The sky over 91791 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population33,028This ZIP33,028
Households10,821This ZIP10,821
Housing units11,320This ZIP11,320
Median age43.4This ZIP43.4California37.9US 38.9
Median household income$102,266This ZIP$102,266California$99,122US $80,734
Median home value$843,600This ZIP$843,600California$734,700US $332,700
Median gross rent$1,915This ZIP$1,915California$2,036US $1,413
Bachelor's degree or higher33.4%This ZIP33.4%
Mean commute33.7 minThis ZIP33.7 min
Population density4,972.6 / sq miThis ZIP4,972.6 / sq mi

Business and tax activity

Business establishments798This ZIP798
Employees9,243This ZIP9,243
Annual payroll$441,711,000This ZIP$441,711,000
Tax returns filed16,270This ZIP16,270
Total adjusted gross income$1,448,113,000This ZIP$1,448,113,000

Land area

Land area6.64 sq miThis ZIP6.64 sq mi
Water area0.02 sq miThis ZIP0.02 sq mi

Other place names in 91791

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

ZIP codes near 91791

ZIPCityDistance
91723 Covina, CA 1.6 mi
91724 Covina, CA 2.5 mi
91790 West Covina, CA 2.6 mi
91722 Covina, CA 2.6 mi
91793 West Covina, CA 2.7 mi
91792 West Covina, CA 2.8 mi
91788 Walnut, CA 3.2 mi
91744 La Puente, CA 3.3 mi
91789 Walnut, CA 3.7 mi
91747 La Puente, CA 4.4 mi

Find every ZIP code within 10 miles of 91791 →

Questions about this ZIP code

Where is ZIP code 91791?

91791 is in West Covina, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 34.0616, -117.8922.

What county is 91791 in?

91791 lies in Los Angeles County.

What area code is 91791?

West Covina uses area code 626, from NANPA's telephone records.

What time zone is 91791 in?

91791 uses America/Los_Angeles.

How many people live in 91791?

About 33,028 people live in ZIP code 91791, in 10,821 households, at 4,972.6 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 91791?

$102,266 a year, against $99,122 across California.

What ZIP codes are near 91791?

The closest are 91723 (1.6 mi), 91724 (2.5 mi), 91790 (2.6 mi), 91722 (2.6 mi) and 91793 (2.7 mi).

Is 91791 a PO Box ZIP code?

91791 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “91791 ZIP Code — West Covina, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91791

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/91791.json

Underlying data is public domain or openly licensed — sources, vintages and licences.