| City: | Alpine, California |
| County: | San Diego County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 9:38:21 AM |
| Population: | No Population Data |
| Area Codes: | 619 / 858 |
| Classification: | PO Box |
| Coordinates: | 32.8352, -116.7659 |
| Quick Link: |
Residents who need street delivery receive it through neighboring ZIP code 91901. The single street route documented here, Arnold Way, handles 113 delivery records that include unit designations. This pattern is typical for communities where the post office maintains a separate ZIP for box service while carrier routes operate under a different code.
Only Arnold Way appears in the ZIP+4 records for this PO Box-designated code, with all 113 records showing unit designations suggesting a multi-unit facility or complex using this ZIP for certain mail types.
ZIP Code 91903 supports both business and residential activity. According to the Business Census (2024), there are 8 business establishments, employing about 32 people with an annual payroll of $1,860,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 2,751Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 8Source: CBP |
| 1st Quarter Payroll: | $363,000Source: CBP |
| Annual Payroll: | $1,860,000Source: CBP |
| # of Employees: | 32Source: CBP |
ZIP Code 91903 is located in San Diego County, California, within the San Diego-Chula Vista-Carlsbad, CA Metropolitan Statistical Area (CBSA 41740) and California's 48th Congressional District. This Metro area has a population of 3,095,313 people, about 0.00% of whom live in ZIP Code 91903. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | San Diego-Chula Vista-Carlsbad, CASource: Census |
| CBSA Number: | 41740Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 3,095,313Source: Census |
| MSA: | San Diego, CA MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 48Source: USPS |
| Congressional Land Area: | 145.47 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0601192Source: Census |
| Place Name: | Alpine CDP; CaliforniaSource: Census |
We could not locate which school district 91903 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 March 1, 2026.