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/91101

91101

ZIP 91101 is in Pasadena, California, in Los Angeles County; area codes 626, 818 and 747; Pacific time. Pasadena has 25 ZIP codes in all.

Type
Standard
Time zone
America/Los_Angeles
County
Los Angeles
Population
21,165
Coordinates
34.1468, -118.1389
☼ Live from 91101 — Pasadena, CA

Weather right now

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NEXRAD radar
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Local time: —

Where 91101 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 91101
  • 🔢 Type 91101 into a pocket calculator and turn it upside down: IOIIG — not quite a word, sorry.
  • ➕ As a number, 91,101 = 3 × 30367. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110001111011101
  • 🏠 Its numerical neighbours: 91077 (Arcadia, CA, 6 mi away) and 91102 (Pasadena, CA, 0 mi away).
  • 🔄 Backwards, 91101 becomes 10119 — and that is a real ZIP code: New York, NY, 2,438 miles away.
  • 👥 10 other ZIP codes are made of exactly the same digits (01119, 09111, 10119, 10911, 11109, 11901, …). The farthest-flung twin is 09111 in APO AE, a military post office, 5,761 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 91101 and you would come out at 34.15°S, 61.86°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 52m.
  • 📏 At 1.3 square miles of land, 91101 is bigger than 9% of ZIP codes — about 615 football fields.
🌙 The sky over 91101 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population21,165This ZIP21,165
Households11,507This ZIP11,507
Housing units12,408This ZIP12,408
Median age36.5This ZIP36.5California37.9US 38.9
Median household income$87,813This ZIP$87,813California$99,122US $80,734
Median home value$682,300This ZIP$682,300California$734,700US $332,700
Median gross rent$2,270This ZIP$2,270California$2,036US $1,413
Bachelor's degree or higher60.1%This ZIP60.1%
Mean commute23.9 minThis ZIP23.9 min
Population density16,665.4 / sq miThis ZIP16,665.4 / sq mi

Business and tax activity

Business establishments2,134This ZIP2,134
Employees26,920This ZIP26,920
Annual payroll$2,792,541,000This ZIP$2,792,541,000
Tax returns filed10,320This ZIP10,320
Total adjusted gross income$1,216,725,000This ZIP$1,216,725,000

Land area

Land area1.27 sq miThis ZIP1.27 sq mi
Water area0.00 sq mi

Other place names in 91101

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

ZIP codes near 91101

ZIPCityDistance
91199 Pasadena, CA 0.3 mi
91102 Pasadena, CA 0.3 mi
91109 Pasadena, CA 0.3 mi
91110 Pasadena, CA 0.3 mi
91114 Pasadena, CA 0.3 mi
91115 Pasadena, CA 0.3 mi
91116 Pasadena, CA 0.3 mi
91117 Pasadena, CA 0.3 mi
91121 Pasadena, CA 0.3 mi
91123 Pasadena, CA 0.3 mi

Find every ZIP code within 10 miles of 91101 →

Questions about this ZIP code

Where is ZIP code 91101?

91101 is in Pasadena, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 34.1468, -118.1389.

What county is 91101 in?

91101 lies in Los Angeles County.

What area code is 91101?

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

What time zone is 91101 in?

91101 uses America/Los_Angeles.

How many people live in 91101?

About 21,165 people live in ZIP code 91101, in 11,507 households, at 16,665.4 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 91101?

$87,813 a year, against $99,122 across California.

What ZIP codes are near 91101?

The closest are 91199 (0.3 mi), 91102 (0.3 mi), 91109 (0.3 mi), 91110 (0.3 mi) and 91114 (0.3 mi).

Is 91101 a PO Box ZIP code?

91101 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “91101 ZIP Code — Pasadena, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91101

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