91001 ZIP Code — Altadena, CA

Los Angeles County, California

ZIP code 91001 is located in Altadena, California, within Los Angeles County. It covers approximately 8.26 square miles and serves a population of 36,420 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 626.

About ZIP code 91001

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $1,002,600. Owner-occupancy is high at 79%, well above the national average.

The gap between median ($129,030) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 7% is below the national average. 35% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 28 minutes is near the national average. Remote work is prevalent — 20% of workers work from home.

Educational attainment is high — 52% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 91001 reflects a community defined by a highly educated population, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

36,420

population

8.26

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

91001 ZIP code map

Cities in ZIP code 91001

Below are the cities the US Postal Service accepts for ZIP code 91001. Using any city not on this list may result in mail delivery delays.

City	Status
Altadena	Preferred

Nearby ZIP codes

91104 Pasadena (2 mi) 91199 Pasadena (2 mi) 91103 Pasadena (2.8 mi) 91011 La Canada Flintridge (3.2 mi) 91011 La Canada Flintridge (3.2 mi) 91110 Pasadena (3.4 mi) 91126 Pasadena (3.4 mi) 91121 Pasadena (3.4 mi) 91124 Pasadena (3.4 mi) 91182 Pasadena (3.4 mi) 91129 Pasadena (3.4 mi) 91125 Pasadena (3.4 mi)

Demographics updated 05/2026

Population
Total population	36,420
Population density	4,409 / sq mi
State FIPS	06
County FIPS	037

Geography
Land area	8.26 sq mi
Water area	0.04 sq mi
Latitude	34.1963
Longitude	-118.1356
Timezone	Pacific (PT)
Area code	626

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	23.4%	36.2%	32.6%
$50k – $100k	23.4%	28.2%	27.7%
$100k – $200k	31.1%	24.5%	26.4%
Over $200k	22.2%	11.0%	13.3%

Demographics & statistics

36,420

Population

4,409

People per sq mi

44.5

Median age

$129,030

Median household income

$63,267

Per capita income

$1,002,600

Median home value

$2,160

Median monthly rent

79.2%

Home ownership

7.1%

Poverty rate

7.5%

Unemployment

10,686

Housing units

51.5%

Bachelor's or higher

Age distribution

Male Female

967

Under 5

1,045

938

5–9

1,015

1,107

10–14

1,197

834

15–19

901

744

20–24

805

1,926

25–34

2,083

2,328

35–44

2,516

2,567

45–54

2,776

1,420

55–59

1,535

1,159

60–64

1,253

1,821

65–74

1,968

1,161

75–84

1,256

528

85+

570

← Male

Female →

Age summary

Group	Count	%
Under 18	7,394	20.3%
18 and over	29,026	79.7%
65 and over	7,304	20.1%
Median age	44.5 years

Race & ethnicity

White 36%

Hispanic or Latino 18.1%

Black or African American 17.5%

Other race 11.6%

Two or more races 11%

Asian 5%

American Indian / Alaska Native 0.8%

Group	Count	%
White	16,004	36%
Hispanic or Latino	8,049	18.1%
Black or African American	7,767	17.5%
Other race	5,160	11.6%
Two or more races	4,903	11%
Asian	2,225	5%
American Indian / Alaska Native	352	0.8%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	23.4%	36.2%	32.6%
$50k – $100k	23.4%	28.2%	27.7%
$100k – $200k	31.1%	24.5%	26.4%
Over $200k	22.2%	11.0%	13.3%

Under $10k 1.9%

$10k–$15k 1.4%

$15k–$25k 3.9%

$25k–$35k 5.2%

$35k–$50k 6.9%

$50k–$75k 11.5%

$75k–$100k 8.2%

$100k–$150k 17.2%

$150k–$200k 12.1%

$200k+ 31.6%

Range	% of households
Under $10k	1.9%
$10k–$15k	1.4%
$15k–$25k	3.9%
$25k–$35k	5.2%
$35k–$50k	6.9%
$50k–$75k	11.5%
$75k–$100k	8.2%
$100k–$150k	17.2%
$150k–$200k	12.1%
$200k+	31.6%
Median income	$129,030

Housing

Home values

Under $50k 1.0%

$50k–$100k 0.3%

$100k–$150k 0.8%

$200k–$300k 0.6%

$300k–$500k 2.4%

$500k–$1M 44.7%

$1M+ 50.2%

Housing overview

Metric	Value
Median home value	$1,002,600
Median rent / month	$2,160
Owner occupied	79.2%
Renter occupied	20.8%
Vacant	6.5%
Single-family detached	90.0%
Large apartment buildings	2.8%
Mobile homes	0.3%
Median rooms	5.9
Avg household size (owned)	2.89

Year built

Era	%
2020 or later	0.2%
2010–2019	1.7%
2000–2009	1.7%
1990–1999	3.5%
1980–1989	2.7%
1970–1979	4.1%
1960–1969	7.6%
1950–1959	18.6%
1940–1949	24.2%
1939 or earlier	35.9%

Bedrooms

Size	% of units
No bedroom (studio)	1.2%
1 bedroom	5.5%
2 bedrooms	25.4%
3 bedrooms	50.7%
4 bedrooms	13.2%
5+ bedrooms	4.1%

Vehicles per household

Vehicles	% of households
No vehicle	3.5%
1 vehicle	27.8%
2 vehicles	43.0%
3 or more	25.7%

Heating fuel

Fuel type	%
Utility gas	79.9%
Electricity	17.1%
Propane / LP gas	0.2%
Fuel oil	0.2%
Wood	0.5%
Solar	0.3%
No fuel used	1.8%

Households & families

Household type	Count	%
Married-couple family	6,526	52.6%
Cohabiting couple	550	4.4%
Male householder, no spouse	1,425	11.5%
Female householder, no spouse	3,907	31.5%
Households with children under 18	3,899	31.4%
Households with seniors (65+)	4,925	39.7%
Average household size	2.89

Marital status

Status	Male	Female
Never married	36.3%	30.1%
Married	54.0%	44.6%
Separated	0.9%	2.4%
Widowed	3.1%	8.4%
Divorced	5.8%	14.6%

Education

Less than 9th grade 4.8%

Some HS, no diploma 2.9%

HS graduate 13.5%

Some college, no degree 18.2%

Associate's degree 9.0%

Bachelor's degree 26.7%

Graduate / professional 24.8%

Metric	%
HS diploma or higher	92.3%
Bachelor's or higher	51.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	589	7.3%
Kindergarten	289	3.6%
Elementary school	3,515	43.3%
High school	1,568	19.3%
College / grad school	2,148	26.5%

Employment

Industry of employment

Education & healthcare 27.8%

Professional & management 18.0%

Arts, food & hospitality 8.8%

Finance & real estate 7.1%

Other services 7.0%

Information 6.7%

Retail trade 5.6%

Public administration 5.3%

Transportation & utilities 4.0%

Construction 3.9%

Manufacturing 3.4%

Wholesale trade 2.0%

Agriculture & mining 0.5%

Occupation

Category	%
Management, business & arts	57.6%
Service	16.6%
Sales & office	14.5%
Natural resources & construction	4.9%
Production & transportation	6.4%

Employment type

Type	%
Private sector	70.7%
Government	16.0%
Self-employed	12.9%
Unpaid family workers	0.5%

Commute

Method	%
Drive alone	67.2%
Carpool	5.8%
Public transit	2.9%
Walk	1.5%
Work from home	20.1%
Other means	2.5%
Avg commute (minutes)	27.9

Poverty

All people 7.1%

Under 18 years 8.6%

18 and over 6.8%

Married-couple families 2.2%

Female-led households 13.1%

Income support

Source	% of households
Social Security	34.8%
Retirement income	25.1%
Supplemental Security	3.2%
Cash public assistance	3.2%
Food stamps / SNAP	4.8%

Health indicators

Condition	%
Obesity	29.6%
High blood pressure	29.9%
High cholesterol	29.8%
Diabetes	10.0%
Heart disease	5.1%
Stroke	2.9%
Asthma	9.5%
Arthritis	19.4%
Kidney disease	2.8%
Pulmonary disease	4.9%
Cancer	6.1%

Behavior / access	%
Smoking	9.2%
Binge drinking	17.0%
No physical activity	17.3%
Less than 7 hrs sleep	33.0%
Depression	16.0%
Fair or poor health	13.1%
Poor mental health	14.0%
Poor physical health	9.1%
No health insurance	11.3%
Visited doctor (checkup)	67.7%
Visited dentist	67.3%
Cholesterol screening	93.7%
Teeth loss	8.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,541	5.3%

Disability	%
Any disability	10.9%
Under 18	1.6%
18–64 years	7.4%
65 and over	30.7%

Health insurance coverage

Type	%
Private insurance	70.6%
Public insurance	37.5%
No insurance	3.3%
Uninsured under 19	0.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	34,408	94.5%
Spanish	3,022	8.8%
Other Indo-European	2,509	7.3%
Asian & Pacific Islander	158	0.5%
Other languages	330	1.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	29,499	81.0%
Born in same state	29,097	79.9%
Born in different state	20,694	56.8%
Foreign born	402	1.1%
Naturalized citizen	6,921	19.0%
Not a US citizen	4,957	71.6%

Ancestry

Ancestry	Count	%
French	3,075	8.4%
Italian	2,671	7.3%
Arab	443	1.2%
Irish	437	1.2%
English	325	0.9%

Ancestry	Count	%
Polish	314	0.9%
Dutch	198	0.5%
German	149	0.4%
Norwegian	105	0.3%

Technology access

Metric	% of households
Computer access	34.1%
Internet access	97.4%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 91001

What city is ZIP code 91001 in?

ZIP code 91001 is primarily assigned to Altadena, California.

What county is ZIP code 91001 in?

ZIP code 91001 falls within Los Angeles County, California.

How educated is the population of ZIP code 91001?

52% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What is the median household income in ZIP code 91001?

The median household income in ZIP code 91001 is $129,030, above the national median of ~$75,000.

What is the typical home value in ZIP code 91001?

The median home value in ZIP code 91001 is $1,002,600.

What is the population of ZIP code 91001?

ZIP code 91001 has an estimated population of 36,420 residents, with a density of 4,409 people per square mile.

What timezone is ZIP code 91001 in?

ZIP code 91001 observes the PST timezone.