Altadena, California Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Altadena, CA Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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A
Health Above average
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B
Income Around average
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A+
Education Top grade
Source: Map AI Methodology
Population
| Metric | Altadena | California Avg | U.S. Average |
|---|---|---|---|
| Population | 39,664 | 39,245,658 | 337,468,954 |
| Population density (per sq mi) | 4676.9 | 239.4 | 86.4 |
| Population growth (%/yr) | -0.94% | 0.19% | 0.59% |
| Median age | 46.8 | 35.5 | 37.3 |
| Households | 14,326 | 13,531,619 | 130,235,071 |
Population in Altadena declined by 6.8% from 2009 to 2024, reaching 39,664 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Altadena is Gen X, aged 45–60, at 24.6% of residents. That is 4.8 points above California as a whole.
- Gen Z 13–28 6,904 17.4% -4.3 pts
- Millennials 29–44 7,908 19.9% -3.7 pts
- Gen X 45–60 9,776 24.6% +4.8 pts
- Boomers 61–79 7,251 18.3% +3.0 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below California, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 52.9% of the people living in Altadena and men 47.1%.
- Women 52.9% California 49.9%
- Men 47.1% California 50.1%
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Economy
Altadena has a the economy index of B, which means it is quite prosperous.
| Metric | Altadena | California Avg | U.S. Average |
|---|---|---|---|
| Median household income | $130,436 | $99,161 | $80,455 |
| Income growth (%/yr) | 5.13% | 5.57% | 4.80% |
| Unemployment rate | 6.3% | 6.6% | 5.2% |
The median household income in Altadena is about 32% higher than in California.
Housing
| Metric | Altadena | California Avg | U.S. Average |
|---|---|---|---|
| Median home price | $1,139,817 | $650,794 | $248,835 |
| Median rent | $2,404 | $2,036 | $1,407 |
| Homeownership rate | 77.3% | 55.9% | 65.2% |
The median home price in Altadena is about 39.5 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $2,404 per month for that long.
Commute Time & Mobility
Commuters in Altadena spend about 47 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 195 hours, about 8.1 full days, spent commuting.
| Metric | Altadena | California Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 23.5 | 23.5 | 22.4 |
| Round-trip commute (min) | 46.9 | 47.0 | 44.8 |
| Yearly time spent (hours) | 195 | 196 | 187 |
| Estimated yearly cost | $6,059 | $6,065 | $5,790 |
| Work from home | 26.1% | 17.2% | 15.0% |
| Highway traffic (vehicles/day) | 29,898 | 16,509 | 8,813 |
| Local road traffic (vehicles/day) | 1,980 | 2,449 | 1,355 |
The average commute time in Altadena is about the same as in California.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Altadena has a education index of A+, which means it is exceptionally educated.
| Metric | Altadena | California Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 49.3% | 33.0% | 31.6% |
| Average household size | 2.71 | 2.84 | 2.53 |
Health
Altadena has a health index of A, which means it is very healthy.
| Metric | Altadena | California Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 81.9 | 79.6 | 78.3 |
| Self-rated poor health | 13.0% | 16.4% | 16.3% |
| Smokers | 9.2% | 13.9% | 19.0% |
Altadena, CA Compared With Nearby Cities
How Altadena, CA compares with the 1 cities closest to it.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Altadena, CA | 39,664 | $130,436 #1/2 | $1,139,817 #1/2 | 23.5 min #2/2 |
| Pasadena, CA | 138,535 | $104,894 | $365,686 | 22.6 min |
Frequently Asked Questions
Common questions about Altadena, California.
What is the population of Altadena, California?
About 39,664 people live in Altadena, California, in 14,326 households of 2.7 people on average. The median age is 46.8, so residents are older than the U.S. median of 37.3 by about 10 years.
Is Altadena, California mostly urban or rural?
Averaged over its land area, Altadena, California has 4,677 people per square mile, a density typical of a city. That is about 54 times the U.S. average of 86.
How affordable is housing in Altadena, California?
The median home costs 8.7 times the median household income ($1,139,817 against $130,436), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $2,404 a month takes about 22% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How common is a college degree in Altadena, California?
49.3% of adults in Altadena, California hold a bachelor's degree or higher (about 1 in 2), well above the U.S. share of 31.6%.
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