| City: | Atascadero, California |
| County: | San Luis Obispo County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 10:40:10 PM |
| Population: | No Population Data |
| Area Codes: | 805 / 820 |
| Classification: | PO Box |
| Coordinates: | 35.4896, -120.6698 |
| Quick Link: |
ZIP code 93423 serves as Atascadero's dedicated PO Box facility. While the city's street delivery operates through the neighboring ZIP 93422, this facility maintains 1,093 PO Boxes and serves 380 business delivery points. It's classified as a PO Box ZIP, but this doesn't mean Atascadero lacks street delivery. The city has both options available.
All mail addressed to this ZIP goes to one location on El Camino Real, California's historic highway connecting the missions. The 191 ZIP+4 records for this street include unit designators, indicating a multi-tenant facility. Businesses make up a significant portion of users at this location, with 380 business delivery points alongside the PO Boxes.
This is not a PO Box Only Zone. Atascadero residents can receive street delivery through ZIP 93422 or choose a PO Box at 93423. The dual-ZIP system is common in California towns, separating PO Box services from carrier delivery routes. With 11 business establishments employing 55 people associated with this ZIP, it functions primarily as a mail services hub rather than a residential area.
For PO Box delivery, use:
PO Box [Number]
Atascadero, CA 93423For street delivery in Atascadero, use ZIP code 93422.
The single street, El Camino Real, is California's historic mission highway and hosts the PO Box facility with multi-unit addressing.
ZIP Code 93423 supports both business and residential activity. According to the Business Census (2024), there are 12 business establishments, employing about 109 people with an annual payroll of $2,854,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 5,239Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 12Source: CBP |
| 1st Quarter Payroll: | $678,000Source: CBP |
| Annual Payroll: | $2,854,000Source: CBP |
| # of Employees: | 109Source: CBP |
ZIP Code 93423 is located in San Luis Obispo County, California, within the San Luis Obispo-Paso Robles, CA Metropolitan Statistical Area (CBSA 42020) and California's 19th and 24th Congressional Districts. This Metro area has a population of 281,486 people, about 0.00% of whom live in ZIP Code 93423. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | San Luis Obispo-Paso Robles, CASource: Census |
| CBSA Number: | 42020Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 281,486Source: Census |
| MSA: | San Luis Obispo-Atascadero-Paso Robles, CA MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 19,24Source: USPS |
| Congressional Land Area: | 915.34, 6883.35 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0603064Source: Census |
| Place Name: | Atascadero city; CaliforniaSource: Census |
We could not locate which school district 93423 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.