Altadena is a community in Los Angeles County, California, home to about 41,705 people across 8.5 square miles. Its ZIP code is 91001, and parts of 91104 are in Altadena too.
Homes sold for a median of $749 per square foot in the three months ending August 2026, a seller’s market.
Mostly Altadena; also Pasadena
Mostly Pasadena; part is in Altadena
Each card is that ZIP code’s whole market, including any part outside Altadena. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Altadena’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Hollywood Burbank/Bob Hope Airport (BUR)13 miles away |
|---|---|
| Nearest city of 250,000+ | Los Angeles, CA20 miles away |
Straight-line distances from the center of Altadena; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Altadena had 42,846 residents in the 2020 census, up 1% since 2000.
It’s the 217th largest of 1,563 towns in California by population.
Los Angeles County grew from 170,298 residents in 1900 to 10,014,009 in 2020.
Los Angeles County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 91°F in summer, and winter lows average 45°F. About 20 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Pasadena, CA weather station (3 miles away).
3,987,736 jobs at 304,988 businesses in Los Angeles County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
247 doctors and other health care providers list an office in Altadena.
Nearest hospitals
Providers with an office here
| Primary care doctors | 2 |
|---|---|
| Specialist doctors | 7 |
| Dentists | 14 |
| Nurse practitioners and physician assistants | 11 |
| Mental health providers | 190 |
| Physical and occupational therapists | 11 |
| Optometrists | 1 |
| Chiropractors | 11 |
| Pharmacies | 5 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (8 nearby)
Grocery stores (7 nearby)
Pharmacies (2 nearby)
Libraries (3 nearby)
Museums
Theaters and performance venues
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1887.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Pasadena Unified, OCS - South District, Odyssey Charter District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Altadena ElementaryAltadena | K–5 | 527 | Public | 0.4 mi |
| Mary W. Jackson STEAM Multilingual Magnet ElementaryAltadena | K–5 | 658 | Public | 1.5 mi |
| OCS - SouthAltadena | K–8 | 392 | Charter | 0.8 mi |
| Odyssey CharterAltadena | K–8 | 463 | Charter | 1.5 mi |
| Charles W. Eliot MiddleAltadena | 6–8 | 407 | Public | 0.6 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Firehouse PreschoolAltadena | Pre-K–2 | 25 | Nonsectarian | 1.6 mi |
| Meher Montessori SchoolAltadena | Pre-K–K | 1 | Nonsectarian | 0.5 mi |
| Oak Knoll Montessori SchoolAltadena | Pre-K–8 | 51 | Nonsectarian | 1.1 mi |
| Pasadena Waldorf SchoolAltadena | Pre-K–12 | 212 | Nonsectarian | 0.4 mi |
| Princeton Montessori SchoolAltadena | Pre-K–K | 12 | Nonsectarian | 0.5 mi |
| Sahag-Mesrob Armenian Christian SchoolAltadena | Pre-K–8 | 131 | Christian (no specific denomination) | 0.5 mi |
| St Elizabeth SchoolAltadena | TK–8 | 154 | Roman Catholic | 0.9 mi |
| Fair Oaks SchoolAltadena | K–5 | 30 | Nonsectarian | 0.6 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Pasadena.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.