Altadena, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Altadena, California is 41,921 as of the 2023 American Community Survey, making it the 217th-largest city in California. The median household income is $129,123, the median home value is $1,073,500, and the median age is 46.2.
41,921
Population
4952
People / sq mi
$129,123
Median Income
$1,073,500
Median Home Value
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Altadena covers 8.5 sq mi of land at 4952 people per square mile.
About Altadena, CA
In Altadena, home values do the distinguishing — a median of $1,073,500. Altadena is a city in California with a population of 41,921.
Households take in a median $129,123, comfortably above the US median of $78,538. The poverty rate is 5.3%, below the national 12.4%. Real estate commands a premium here — a median home value of $1,073,500, with typical rent around $2,250.
Educational attainment is on the higher side for US cities — 52.7% of adults hold a four-year degree, above the national 35.0%. Remote work is on the higher side at 23.4%, above the national 14.0%, and the average commute runs about 27 minutes each way.
High housing values reframe the income picture in Altadena — even solid earnings stretch less against home prices and rents at this level.
Race & Ethnicity
| White | 46.0% |
| Black or African American | 18.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 3.1% |
| Two or More Races | 0.0% |
Economy & Income
$129,123
Median Household Income
$65,192
Per Capita Income
5.3%
Poverty Rate
4.7%
Unemployment Rate
Housing
$1,073,500
Median Home Value
$2,250
Median Rent
78.3%
Owner-Occupied
Education
92.8%
High School+
52.7%
Bachelor's+
Commute
1.5%
Drive Alone
65.3%
Public Transit
23.4%
Work From Home
27.1 min
Avg Commute
Community Profile
22.5%
Foreign Born
68.7%
Non-English at Home
4.2%
Veterans
10.8%
With Disability
96.4%
Health Insurance
97.1%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 28.1% |
| Finance, Insurance & Real Estate | 17.8% |
| Transportation & Warehousing | 7.8% |
| Education, Health Care & Social Services | 7.3% |
| Information | 6.8% |
| Arts, Entertainment & Food Services | 6.5% |
| Public Administration | 5.6% |
| Retail Trade | 4.2% |
| Construction | 3.8% |
| Manufacturing | 3.2% |
| Agriculture & Mining | 0.7% |
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Frequently Asked Questions
Altadena, California has a population of 41,921 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 217th-largest city in California.
The median household income in Altadena, California is $129,123, with 5.3% of residents living below the federal poverty level.
The median home value in Altadena, California is $1,073,500, with median monthly rent at $2,250 and a homeownership rate of 78.3%.
The median age in Altadena, California is 46.2 years. The population is 47.0% male and 53.0% female.
Altadena Cdp, CA Climate
Altadena Cdp, CA has an average annual temperature of 16.3°C (61°F) and receives about 498 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
16.3°C
Avg Temp
498
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 11° / 51° | 97 mm |
| February | 11° / 52° | 103 mm |
| March | 12° / 53° | 92 mm |
| April | 14° / 57° | 39 mm |
| May | 16° / 61° | 10 mm |
| June | 20° / 68° | 2 mm |
| July | 23° / 74° | 1 mm |
| August | 24° / 75° | 5 mm |
| September | 22° / 72° | 10 mm |
| October | 18° / 65° | 14 mm |
| November | 14° / 56° | 57 mm |
| December | 11° / 52° | 68 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Altadena Cdp, CA
The most comfortable months to visit Altadena Cdp, CA are typically June, September and July, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 31°C high). The coldest is January (near 5°C low). February is usually the wettest month.
Where to stay near Altadena
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.