| City: | San Marino, California |
| City Alias: | Pasadena |
| County: | Los Angeles County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 10:02:46 PM |
| Population: | No Population Data |
| Area Codes: | 323 / 626 / 738 |
| Classification: | PO Box |
| Coordinates: | 34.1478, -118.1436 |
| Quick Link: |
ZIP code 91118 isn't a neighborhood or community. It's a PO Box ZIP assigned to a branch post office in San Marino, California. The post office sits on Huntington Drive, one of the main commercial corridors running through the San Gabriel Valley. With 407 PO Boxes and 222 business delivery points, this location serves local residents and businesses who prefer or need a separate mailing address.
San Marino is one of the wealthiest cities in Los Angeles County, known for the Huntington Library and its historic residential estates. This 91118 branch provides an alternative to home delivery for residents who want added privacy or security for their mail. It also accepts Pasadena as a valid city name, since the branch sits near the boundary between the two cities.
The ZIP has no residential population of its own because it's a point location, not a geographic territory. It exists entirely within the boundaries of ZIP 91108, which covers most of San Marino. This setup is common for branch post offices in affluent suburban areas where demand for PO Boxes exceeds what the main post office can handle.
The only street in this ZIP is Huntington Drive, the location of the branch post office.
ZIP Code 91118 supports both business and residential activity. According to the Business Census (2024), there are 3 business establishments, employing about 2 people with an annual payroll of $89,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 625Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 3Source: CBP |
| 1st Quarter Payroll: | $23,000Source: CBP |
| Annual Payroll: | $89,000Source: CBP |
| # of Employees: | 2Source: CBP |
ZIP Code 91118 is located in Los Angeles County, California, within the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area (CBSA 31080) and California's 28th Congressional District. This Metro area has a population of 13,012,469 people, about 0.00% of whom live in ZIP Code 91118, and is subdivided into the Los Angeles-Long Beach-Glendale, CA division. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Los Angeles-Long Beach-Anaheim, CASource: Census |
| CBSA Number: | 31080Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | Los Angeles-Long Beach-Glendale, CA (CBSA Div 31084)Source: Census |
| CBSA Population: | 13,012,469Source: Census |
| MSA: | Los Angeles-Riverside-Orange County, CASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 28Source: USPS |
| Congressional Land Area: | 218.45 sq miSource: Census |
| PMSA: | Los Angeles-Long Beach, CA PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0668224Source: Census |
| Place Name: | San Marino city; CaliforniaSource: Census |
We could not locate which school district 91118 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on January 1, 2026.