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 — CITY/CA/ALTADENA

Altadena ZIP codes, California

Altadena, CA has 2 ZIP codes (91001 and 91003) and area codes 626, 818 and 747. The largest is 91001.

USPS city name
2 ZIP codes
Overlapping the city
2 more
Population
41,705
Area codes
626, 818, 747

NANPA lists no telephone rate centre for Altadena itself, so these are the area codes of the nearest one, Pasadena (1.7 miles). A town on an area-code boundary can differ from its neighbour.

Mail addressed to Altadena uses the ZIP codes above. 2 more ZIP codes cover part of the city but are addressed as somewhere else; they are listed separately below.

Altadena in numbers

About 41,705 people live in Altadena, in 15,092 households. The median household income is $128,720 a year, 30% above the California median of $99,122 (US: $80,734). The median owner-occupied home is valued at $1,120,000 (52% above the California median), and median gross rent is $2,355 a month. The median age is 46.4; 53.3% of adults 25 and over hold a bachelor's degree or higher (37.1% across California); the average commute takes 28 minutes.

Population41,705Altadena41,705
Households15,092Altadena15,092
Median age46.4Altadena46.4California37.9US 38.9
Median household income$128,720Altadena$128,720California$99,122US $80,734
Median home value$1,120,000Altadena$1,120,000California$734,700US $332,700
Median gross rent$2,355Altadena$2,355California$2,036US $1,413
Bachelor's degree or higher53.3%Altadena53.3%California37.1%US 35.7%
Mean commute27.5 minAltadena27.5 minCalifornia28.7 minUS 26.4 min
Population density4,927 / sq miAltadena4,927 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Altadena CDP. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Altadena

ZIP codes with the USPS city name Altadena
ZIP City Type Population Median income Median home
91001 Altadena , CA Standard 35,475 $134,903 $1,135,200
91003 Altadena , CA No street area — — —

Other ZIP codes overlapping Altadena

These ZIP codes cover part of Altadena but are addressed as somewhere else.

ZIP codes overlapping Altadena
ZIP City Type Population Median income Median home
91104 Pasadena , CA Standard 35,937 $105,958 $1,080,100
91107 Pasadena , CA Standard 32,316 $126,449 $1,155,300

Map of Altadena ZIP codes

9100191003

The ZIP codes of Altadena, CA, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Altadena

The nearest larger towns are Pasadena (136,969 people, 2.2 mi), Glendale (190,748 people, 6.3 mi) and Arcadia (55,170 people, 7.0 mi).

Towns near Altadena
TownPopulationDistance
Pasadena 136,969 2.2 mi
La Cañada Flintridge 19,935 3.9 mi
San Marino 12,216 5.0 mi
East Pasadena 5,479 5.1 mi
Sierra Madre 10,940 5.1 mi
South Pasadena 26,068 5.9 mi
East San Gabriel 23,410 6.1 mi
Glendale 190,748 6.3 mi
La Crescenta-Montrose 19,660 6.4 mi
Arcadia 55,170 7.0 mi
San Gabriel 38,392 7.1 mi
Alhambra 81,022 7.5 mi
Temple City 35,430 7.6 mi
Monrovia 37,571 8.8 mi

More nearby: every ZIP code in Los Angeles County · California ZIP codes

Cite this page

zipcodes.pro. “Altadena, CA ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/ca/altadena

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