| City: | San Marcos, California |
| County: | San Diego County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 10:14:26 PM |
| Population: | No Population Data |
| Area Codes: | 442 / 760 |
| Classification: | PO Box |
| Coordinates: | 33.1434, -117.1656 |
| Quick Link: |
ZIP Code 92079 serves as a dedicated PO Box facility for San Marcos, California, located in San Diego County. The post office maintains 878 PO Boxes and handles mail for 443 business delivery points, operating primarily as a commercial mail hub rather than a residential service area. This ZIP doesn't have its own residential population within its boundaries.
The facility operates at a single location on N Twin Oaks Valley Rd, where mail distribution occurs through 118 individual units. San Marcos residents who need residential street delivery use neighboring ZIP codes, but businesses and individuals preferring PO Box service come to this location. With city carrier delivery available and standard ZIP codes serving the broader San Marcos area, the 92079 classification as a PO Box ZIP reflects its specialized function rather than a lack of alternatives.
This isn't a PO Box Only Zone. Street delivery is available throughout San Marcos via other ZIP codes. The 878 boxes serve people and businesses who choose PO Box service for convenience, mail security, or business needs. The concentration of 443 business delivery points indicates this facility plays a significant role in commercial mail operations for the San Marcos area.
Single street location serving as centralized PO Box and business mail facility.
ZIP Code 92079 supports both business and residential activity. According to the Business Census (2024), there are 8 business establishments, employing about 125 people with an annual payroll of $9,689,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 12,751Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 8Source: CBP |
| 1st Quarter Payroll: | $2,000,000Source: CBP |
| Annual Payroll: | $9,689,000Source: CBP |
| # of Employees: | 125Source: CBP |
ZIP Code 92079 is located in San Diego County, California, within the San Diego-Chula Vista-Carlsbad, CA Metropolitan Statistical Area (CBSA 41740) and California's 50th Congressional District. This Metro area has a population of 3,282,782 people, about 0.00% of whom live in ZIP Code 92079. 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: | 3,282,782Source: Census |
| MSA: | San Diego, CA MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 50Source: USPS |
| Congressional Land Area: | 2787.35 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0668196Source: Census |
| Place Name: | San Marcos city; CaliforniaSource: Census |
We could not locate which school district 92079 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.