ZIP Code 92173 — San Ysidro, CA
92173 is a standard (street delivery) ZIP code serving San Ysidro, California, in San Diego 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 92173 at a glance
| ZIP code | 92173 |
|---|---|
| Primary city | San Ysidro |
| State | California (CA) |
| County | San Diego FIPS 06073 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 27,585 |
| Coordinates | 32.555520, -117.051140 |
How ZIP+4 works in 92173
The four digits after the hyphen encode a delivery segment inside 92173. 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 92173 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 92173.
| ZIP | City | Distance |
|---|---|---|
| 91911 | Chula Vista, CA | 3.5 mi |
| 91932 | Imperial Beach, CA | 4 mi |
| 92154 | San Diego, CA | 5.2 mi |
| 91910 | Chula Vista, CA | 5.6 mi |
| 91913 | Chula Vista, CA | 5.9 mi |
| 92179 | San Diego, CA | 7.1 mi |
| 91915 | Chula Vista, CA | 7.5 mi |
| 91950 | National City, CA | 8.2 mi |
| 92139 | San Diego, CA | 8.6 mi |
| 91902 | Bonita, CA | 8.7 mi |
| 91914 | Chula Vista, CA | 9.5 mi |
| 92136 | San Diego, CA | 9.7 mi |
Questions about 92173
What is the ZIP+4 code for 92173?
92173 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 92173, you need to look up a specific street address to get them.
What city is 92173?
92173 is assigned to San Ysidro, California, in San Diego 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.