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/91188

91188

ZIP 91188 is in Pasadena, California, in Los Angeles County; area codes 626, 818 and 747; Pacific time. Pasadena has 25 ZIP codes in all.

Type
No street area
Time zone
America/Los_Angeles
County
Los Angeles
Coordinates
34.1478, -118.1445

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 91101, whose figures describe that area — not this ZIP code.

☼ Live from 91188 — Pasadena, CA

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 91188 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 91188
  • 🔢 Type 91188 into a pocket calculator and turn it upside down: BBIIG — not quite a word, sorry.
  • ➕ As a number, 91,188 = 2 × 2 × 3 × 3 × 17 × 149. Its digits add up to 27, a total 1,806 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110010000110100
  • 🏠 Its numerical neighbours: 91185 (Pasadena, CA, 0 mi away) and 91189 (Pasadena, CA, 0 mi away).
  • 🔄 Backwards, 91188 becomes 88119 — and that is a real ZIP code: Fort Sumner, NM, 786 miles away.
  • 👥 8 other ZIP codes are made of exactly the same digits (18918, 18981, 19188, 88119, 89118, 98118, …). The farthest-flung twin is 19188 in Philadelphia, PA, 2,383 miles away.
  • 🧭 Farther south than 78% of all ZIP codes, and farther west than 91%.
  • 🎯1,146 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91188 and you would come out at 34.15°S, 61.86°E — 996 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 26m of daylight. Shortest: 9h 52m.
🌙 The sky over 91188 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments7This ZIP7
Employees2,177This ZIP2,177
Annual payroll$342,744,000This ZIP$342,744,000

Land area

ZIP codes near 91188

ZIPCityDistance
91102 Pasadena, CA 0.0 mi
91109 Pasadena, CA 0.0 mi
91110 Pasadena, CA 0.0 mi
91114 Pasadena, CA 0.0 mi
91115 Pasadena, CA 0.0 mi
91116 Pasadena, CA 0.0 mi
91117 Pasadena, CA 0.0 mi
91121 Pasadena, CA 0.0 mi
91123 Pasadena, CA 0.0 mi
91124 Pasadena, CA 0.0 mi

Find every ZIP code within 10 miles of 91188 →

Questions about this ZIP code

Where is ZIP code 91188?

91188 is in Pasadena, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 34.1478, -118.1445.

What county is 91188 in?

91188 lies in Los Angeles County.

What area code is 91188?

Pasadena uses area codes 626, 818 and 747, from NANPA's telephone records.

What time zone is 91188 in?

91188 uses America/Los_Angeles.

What ZIP codes are near 91188?

The closest are 91102 (0 mi), 91109 (0 mi), 91110 (0 mi), 91114 (0 mi) and 91115 (0 mi).

Is 91188 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.

Download or cite

Cite this page

zipcodes.pro. “91188 ZIP Code — Pasadena, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91188

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/91188.json

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