Residential delivery area · California
ZIP Code 91108: San Marino, CA
ZIP code 91108 is in San Marino, California, entirely in Los Angeles County (Census 2020 ZIP-county file). About 12,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $204,847 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2021
- ZBP2023
- IRS2022
- Town
- San Marino · its only residential ZIP
- County
- Los Angeles County
- Census places
- San Marino
- Metro area
- Los Angeles-Long Beach-Anaheim, CA
- House district
- CA-28 119th Congress
- State
- California
- Time zone
- Pacific
- Land area
- 3.8 sq mi · 3,273 people per sq mi
- PO Box ZIPs
- 91118 also use the name San Marino
Where is ZIP code 91108?
91108 centers on 34.122°, -118.114° and covers 3.8 square miles of land plus 0.0 of water. It borders 5 ZIP codes: 91106, 91775, 91801, 91030, 91107.
The map draws ZIP code areas only. For the streets inside 91108, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 91108 compare with the rest of Los Angeles County?
| Measure | 91108 | In Los Angeles County | In CA |
|---|---|---|---|
| People (ACS 2020-2024) | 12,401 | 250th of 301 | 956th of 1,802 |
| Median household income | $205k | 3rd of 265 | 43rd of 1,189 |
| Median home value | $2M+ | 1= of 273 | 1= of 1,317 |
1= means a shared first place: 91108's median home value ties with 14 other ZIP codes at the Census cap in Los Angeles County; median home value ties with 61 other ZIP codes at the Census cap in California.
Its median household income is higher than in 99% of U.S. residential ZIP codes, and it is denser than 90% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 91108?
The 2020 Census counted 12,777 people in 91108; the ACS, which samples households over 2020-2024, estimates 12,401. Between the 2010 and 2020 censuses its population fell 4.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 12,401
- 2020 Census count
- 12,777−4.4% since 2010 (13,361)
- Households
- 4,038
- Median age
- 46.1
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 91108?
Of the 12,401 people the ACS estimates in 91108, 23.5% are under 18 and 23.5% are 65 or older. The largest group by race and Hispanic origin is Asian (not Hispanic) (67.5%), then White (not Hispanic) (22.4%).
- Under 1823.5%
- 18 to 6453.1%
- 65 and older23.5%
- Asian, not Hispanic67.5%
- White, not Hispanic22.4%
- Hispanic or Latino5.4%
- Other or two or more4.5%
- Black, not Hispanic0.1%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 91108 earn?
Median household income is $204,847 (ACS 2020-2024), the 3rd highest of the 265 ranked ZIP codes in Los Angeles County. It is not measurably different from 2015-2019 ($203,392 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $204,847±$32,194
- Income per person
- $101,946
- Below the poverty line
- 6.6%
- Unemployed (of the labor force)
- 5.3%
- Adults 25+ with a bachelor's degree
- 82.5%
- Adjusted gross income per tax return, 2022
- $369,2766,360 returns; wages 35% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 91108?
- Median home value (owners' estimate)
- $2,000,000 or more
- Median gross rent
- $3,500 or more
- Homes owned by their occupants
- 82.0%
- Housing units
- 4,567
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 91108?
653 business establishments had a location in this ZIP code in 2023, 53 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services136
- Health care and social assistance91
- Real estate and rental and leasing89
- Wholesale trade59
- Finance and insurance53
- Other services (except public administration)40
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 91108?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 91106 | Pasadena | 23,910 | $90k | 1.4 mi |
| 91775 | San Gabriel | 23,672 | $119k | 1.6 mi |
| 91801 | Alhambra | 53,381 | $89k | 2.3 mi |
| 91030 | South Pasadena | 26,068 | $127k | 2.6 mi |
| 91107 | Pasadena | 32,316 | $126k | 3.0 mi |
| 91125 | Pasadena | 1,000 | – | 1.2 mi (near) |
| 91101 | Pasadena | 21,165 | $88k | 2.2 mi (near) |
| 91776 | San Gabriel | 36,952 | $82k | 2.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.
Which other ZIP codes use the name San Marino?
1 more ZIP code carries the postal name San Marino, CA without a residential delivery area: PO boxes at the post office, or a single organization with its own ZIP code. The Census Bureau publishes no figures for it.
| ZIP | County |
|---|---|
| 91118 | Los Angeles County |
Source: GeoNames postal codes (CC BY 4.0), downloaded 2026-10-09; a ZIP code with no Census ZCTA has no residential delivery area.