91121

ZIP 91121 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
Metro area: Los Angeles-Long Beach-Anaheim, CA
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 91121 — Pasadena, CA

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Where 91121 is

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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 91121

🔢 Type 91121 into a pocket calculator and turn it upside down: IZIIG — not quite a word, sorry.
➕ 91121 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 14, a total 1,416 other ZIP codes share.
💾In binary, the way a computer stores it: 10110001111110001
🏠 Its numerical neighbours: 91118 (San Marino, CA, 3 mi away) and 91123 (Pasadena, CA, 0 mi away).
🔄 Backwards, 91121 becomes 12119, which is not a ZIP code at all.
👥 7 other ZIP codes are made of exactly the same digits (11219, 12911, 19112, 19121, 21911, 29111, …). The farthest-flung twin is 12911 in Keeseville, NY, 2,459 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 91121 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.

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Source: USGS.

Land area

ZIP codes near 91121

ZIP	City	Distance
`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
`91123`	Pasadena, CA	0.0 mi
`91124`	Pasadena, CA	0.0 mi
`91126`	Pasadena, CA	0.0 mi

Find every ZIP code within 10 miles of 91121 →

Questions about this ZIP code

Where is ZIP code 91121?

91121 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 91121 in?

91121 lies in Los Angeles County.

What area code is 91121?

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

What time zone is 91121 in?

91121 uses America/Los_Angeles.

What ZIP codes are near 91121?

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

Is 91121 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. “91121 ZIP Code — Pasadena, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91121

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/91121.json

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