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US ZIP Code Profile

ZIP Code 91108
San Marino, California

ZIP code 91108 is in San Marino, located in Los Angeles County, California, within the Los Angeles-Long Beach-Anaheim metro area. Its 2020 Census population was 12,777. The estimated median adjusted gross income per tax return is $125,664, and about 37% of filers report $200,000 or more.

2020 Population
12,777
Census ZCTA
County
Los Angeles
FIPS 06037
Median income (est.)
$125,664
IRS SOI 2022
Land Area
3.812 mi²
+ 0.007 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CitySan Marino, CA
CountyLos Angeles County (FIPS 06037)
StateCalifornia (FIPS 06)
Metro Area (MSA)Los Angeles-Long Beach-Anaheim, CA Metro Area (31080)
Census Region / DivisionWest Region · Pacific Division
Coordinates34.12267, -118.11291
Land / Water Area3.812 mi² land · 0.007 mi² water

02Income & Economics

Distribution of the 6,360 individual tax returns filed in 91108 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
19.5%
$25K–$50K
11.0%
$50K–$75K
8.2%
$75K–$100K
6.8%
$100K–$200K
17.8%
$200K+
36.8%
The $200,000+ bracket accounts for 88% of 91108's total adjusted gross income, from 37% of returns — a concentration that drives the gap between the median ($125,664) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 91108's IRS income metrics, 2020–2022.

Median income (2021→2022)
$125,664
▲ 0.7%
Filers earning $200K+
36.8%
▼ 0.3 pt
Total filers
6,360
▼ 1.7%
GET /zipc/v2/zipcodes/91108/soi?year=… $99K 2020 $125K 2021 $126K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 91108 ZCTA.

2000
13,149
 
2010
13,361
▲ +1.6%
2020
12,777
▼ -4.4%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 91108. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 91108

San Marino and its immediate neighbors, sorted by distance.

3 mi
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Distance from 91108 to any ZIP

Enter a 5-digit ZIP to calculate the distance.

06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypeBranch
Carrier Route SortB
USPS Finance Number055862
City AliasesPasadena, San Marino

07Frequently Asked Questions

What county is ZIP code 91108 in?

ZIP code 91108 is in Los Angeles County, California (county FIPS code 06037).

What city is ZIP code 91108?

The primary USPS city for 91108 is San Marino, CA.

What metro area (MSA) is 91108 in?

91108 is part of the Los Angeles-Long Beach-Anaheim, CA Metro Area (MSA code 31080).

What is the population of ZIP code 91108?

The 2020 Census population of 91108 was 12,777 residents.

What is the median income in ZIP code 91108?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 91108 is about $125,664, with around 37% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.