Altadena, CA · standard
ZIP Code 91001
Los Angeles County, California - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 36,126
- 1,690/sq mi High-density area
- $134,903
- Median income Above-median income area
- $1,135,200
- Median home value Above-median home value
- 53.9%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
Altadena pairs a top-decile household income with top-decile home values, in a low-density, homeowner-dominated area.
- Top 6%
- household income, US ZIPs
- Top 2%
- home value, US ZIPs
- 1,690
- people per sq mi
- 80%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 91001 against every reporting US ZIP.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 91001 (Altadena, CA) rose +9.1% from 2023 to 2024. The all-transactions index moved from 431.5 in 2023 to 470.7 in 2024 (2000 = 100).
ZIP code 91001 is a densely settled ZIP (a standard USPS delivery area) in Altadena, Los Angeles County, California, with 36,126 residents across 21.4 square miles, a density of 1,690 people per square mile, in the Los Angeles time zone.
ZIP 91001 skews affluent, with a median household income of $134,903 (33% above the average California ZIP), while per-capita income is $68,163. The poverty rate is 7.4%, with unemployment at 7.3%; those measures add context to the income figure. Housing is both higher-cost and owner-heavy: median home value is $1,135,200 (47% above the average California ZIP), while 79.9% of occupied homes are owner-occupied and median rent is $2,437.
This is a highly-educated ZIP: 53.9% of adults hold a bachelor's degree or higher, the median age is 46.3, and the average commute is 28 minutes. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Los Angeles County, so 91001 can be compared with both its immediate and county-level context.
Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →
Top industries in ZIP 91001
Top 5 sectors by establishment count in Altadena, CA
Which industries have the most business establishments in ZIP 91001.
- Professional, scientific, and technical services
Professional, scientific, and technical services
146 establishments
- Health care and social assistance
Health care and social assistance
112 establishments
- Arts, entertainment, and recreation
Arts, entertainment, and recreation
86 establishments
- Construction 52
Construction
52 establishments
- Information 51
Information
51 establishments
What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 91001, Altadena, CA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.
Quick Facts
36,126
Population
21.4
Area (sq mi)
1,690
People / sq mi
Los Angeles
Time Zone
standard
ZIP Type
Who lives in ZIP 91001?
46.3
Median Age
48.6%
Male
51.4%
Female
20.0%
Foreign-Born
Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$134,903
Median Household Income
+33% vs state ZIP avg
$68,163
Per Capita Income
7.4%
Poverty Rate
7.3%
Unemployment Rate
28.0 min
Mean Commute Time
How ZIP 91001 ranks nationally
Altadena, CA household income vs. every US ZIP code
Median household income, the full national distribution, with this ZIP marked
$134,903 Top 6% higher than 94% of 30,318 US ZIPs
Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
13,216housing units
13,216
Total Housing Units
12,587
Occupied Units
629
Vacant Units
2.76
Avg Household Size
Occupancy Type
$1,135,200
Median Home Value
+47% vs state ZIP avg
$2,437
Median Rent
1946
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How have home values changed over time?
FHFA House Price Index, annual appreciation data based on repeat sales and appraisals
+9.1%
YoY Change (2024)
471
HPI Index (2000 = 100)
+371%
Total Change Since 2000
Home values in ZIP 91001 have increased 9.1% over the past year (2024). Since 2000, this ZIP has seen +371% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +2.5% | 319 |
| 2021 | +9.5% | 350 |
| 2022 | +16.7% | 408 |
| 2023 | +5.7% | 431 |
| 2024 | +9.1% | 471 |
Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.
What businesses operate in this ZIP?
Census Bureau data shows 752 business establishments in ZIP 91001, employing approximately 4,913 people with a combined annual payroll of $282,507,000.
752
Businesses
4,913
Employees
$282.5M
Annual Payroll
16
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Professional, scientific, and technical services | 146 | 19.4% |
| Health care and social assistance | 112 | 14.9% |
| Arts, entertainment, and recreation | 86 | 11.4% |
| Construction | 52 | 6.9% |
| Information | 51 | 6.8% |
| Retail trade | 49 | 6.5% |
| Other services (except public administration) | 48 | 6.4% |
| Accommodation and food services | 41 | 5.5% |
| Administrative and support and waste management and remediation services | 34 | 4.5% |
| Real estate and rental and leasing | 32 | 4.3% |
| Educational services | 32 | 4.3% |
| Finance and insurance | 23 | 3.1% |
| Wholesale trade | 20 | 2.7% |
| Manufacturing | 9 | 1.2% |
| Transportation and warehousing | 8 | 1.1% |
| Utilities | 3 | 0.4% |
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 91001 vs 91104 →
ZIP 91001 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 91104
Pasadena (91104)
36,751 residents
- 91001
Altadena (91001)
36,126 residents
- 91107
Pasadena (91107)
32,940 residents
- 91103
Pasadena (91103)
27,480 residents
- 91030
South Pasadena (91030)
25,616 residents
- 91106
Pasadena (91106)
24,229 residents
- 91101
Pasadena (91101)
20,460 residents
- 91011
La Canada Flintridge (91011)
20,280 residents
- 91208
Glendale (91208)
16,245 residents
What this shows Among its immediate neighbors, ZIP 91001 ranks #2 by population - useful context the national average alone can't give.
ZIP 91001 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 91011
La Canada Flintridge (91011)
$241,875 median income
- 91108
San Marino (91108)
$204,847 median income
- 91105
Pasadena (91105)
$156,791 median income
- 91208
Glendale (91208)
$136,892 median income
- 91001
Altadena (91001)
$134,903 median income
- 91030
South Pasadena (91030)
$127,175 median income
- 91107
Pasadena (91107)
$126,449 median income
- 91104
Pasadena (91104)
$105,958 median income
- 91103 $93,660
Pasadena (91103)
$93,660 median income
What this shows By household income, ZIP 91001 ranks #5 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 91104 | Pasadena, CA | 36,751 | 2.1 mi |
| 91101 | Pasadena, CA | 20,460 | 3.4 mi |
| 91103 | Pasadena, CA | 27,480 | 2.4 mi |
| 91106 | Pasadena, CA | 24,229 | 4.0 mi |
| 91105 | Pasadena, CA | 11,254 | 4.3 mi |
| 91107 | Pasadena, CA | 32,940 | 3.9 mi |
| 91011 | La Canada Flintridge, CA | 20,280 | 4.2 mi |
| 91108 | San Marino, CA | 13,361 | 5.2 mi |
| 91208 | Glendale, CA | 16,245 | 5.6 mi |
| 91030 | South Pasadena, CA | 25,616 | 6.0 mi |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 91001, both outside CA so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (36,126 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Los Angeles County
Related Areas
Frequently Asked Questions
What county is ZIP code 91001 in?
ZIP code 91001 (Altadena) is located in Los Angeles County, California. Los Angeles County contains multiple ZIP codes, see the full list at /counties/los-angeles-ca.
What is the population of ZIP code 91001?
ZIP code 91001 in Altadena, CA has a population of 36,126 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 91001?
The median household income in ZIP 91001 is $134,903, which is 77% above the national average of $76,288.
What is the average home value in ZIP 91001?
The median home value in ZIP 91001 is $1,135,200, which is 308% above the national average of $278,155.
What is the demographic makeup of ZIP 91001?
The largest racial group in ZIP 91001 is White at 39.0%. Hispanic or Latino residents make up 28.6% of the population.
How many businesses are in ZIP code 91001?
ZIP code 91001 has 752 business establishments employing approximately 4,913 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 91001?
The top industries by establishment count in ZIP 91001 are: Professional, scientific, and technical services (146), Health care and social assistance (112), Arts, entertainment, and recreation (86). There are 16 industry sectors represented in total.
How have home values changed in ZIP code 91001?
According to the FHFA House Price Index, home values in ZIP 91001 increased by 9.1% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 371%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 91001?
In ZIP code 91001, 67.8% of residents aged 25+ have a high school diploma or higher, and 53.9% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 91001?
The mean commute time for workers in ZIP code 91001 is 28.0 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend more time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 91001?
In ZIP code 91001, approximately 79.9% of occupied housing units are owner-occupied and 20.1% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 91001?
The poverty rate in ZIP code 91001 is 7.4% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.
Related
Take this with you
What to do with ZIP 91001's numbers, next.
- See how ZIP 91001 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Altadena, CA ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.