| City: | Castaic, California |
| City Alias: | Santa Clarita |
| County: | Los Angeles County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 10:04:25 PM |
| Population: | No Population Data |
| Area Code: | 661 |
| Classification: | PO Box |
| Coordinates: | 34.4864, -118.5786 |
| Quick Link: |
The facility sits in what's become a growing corridor between the Santa Clarita Valley and Interstate 5. Castaic Lake, a major recreation area, draws visitors year-round, and the community has expanded as part of the broader Santa Clarita region's development. The PO boxes here provide a stable mailing address for residents who prefer that option and for businesses that need a consistent presence separate from physical locations. Franklin Parkway, which appears in the postal database with unit designations, houses most of the delivery points associated with this facility.
Only one street appears in the postal records for this ZIP. Franklin Parkway has 49 delivery records with unit designations, suggesting a multi-tenant facility or business park that uses this PO Box ZIP for mail receipt.
ZIP Code 91310 supports both business and residential activity. According to the Business Census (2024), there are 4 business establishments, employing about 8 people with an annual payroll of $461,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 226Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 4Source: CBP |
| 1st Quarter Payroll: | $98,000Source: CBP |
| Annual Payroll: | $461,000Source: CBP |
| # of Employees: | 8Source: CBP |
ZIP Code 91310 is located in Los Angeles County, California, within the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area (CBSA 31080) and California's 27th Congressional District. This Metro area has a population of 13,012,469 people, about 0.00% of whom live in ZIP Code 91310, 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: | 27Source: USPS |
| Congressional Land Area: | 699.9 sq miSource: Census |
| PMSA: | Los Angeles-Long Beach, CA PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0611796Source: Census |
| Place Name: | Castaic CDP; CaliforniaSource: Census |
We could not locate which school district 91310 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.