ZIP Code 93402 — Los Osos, CA
93402 is a standard (street delivery) ZIP code serving Los Osos, California, in San Luis Obispo County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 93402 at a glance
| ZIP code | 93402 |
|---|---|
| Primary city | Los Osos |
| State | California (CA) |
| County | San Luis Obispo FIPS 06079 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 14,197 |
| Coordinates | 35.290820, -120.839200 |
How ZIP+4 works in 93402
The four digits after the hyphen encode a delivery segment inside 93402. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 93402 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 93402.
| ZIP | City | Distance |
|---|---|---|
| 93405 | San Luis Obispo, CA | 6.4 mi |
| 93424 | Avila Beach, CA | 6.9 mi |
| 93408 | San Luis Obispo, CA | 7.1 mi |
| 93442 | Morro Bay, CA | 7.8 mi |
| 93409 | San Luis Obispo, CA | 8.3 mi |
| 93407 | San Luis Obispo, CA | 9.6 mi |
| 93410 | San Luis Obispo, CA | 10.3 mi |
| 93401 | San Luis Obispo, CA | 13 mi |
| 93449 | Pismo Beach, CA | 14 mi |
| 93422 | Atascadero, CA | 14.6 mi |
| 93430 | Cayucos, CA | 14.7 mi |
| 93433 | Grover Beach, CA | 17.1 mi |
Questions about 93402
What is the ZIP+4 code for 93402?
93402 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 93402, you need to look up a specific street address to get them.
What city is 93402?
93402 is assigned to Los Osos, California, in San Luis Obispo County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.