ZIP Code 92003 — Bonsall, CA
92003 is a standard (street delivery) ZIP code serving Bonsall, 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 92003 at a glance
| ZIP code | 92003 |
|---|---|
| Primary city | Bonsall |
| State | California (CA) |
| County | San Diego FIPS 06073 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 5,061 |
| Coordinates | 33.287010, -117.199770 |
How ZIP+4 works in 92003
The four digits after the hyphen encode a delivery segment inside 92003. 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 92003 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 92003.
| ZIP | City | Distance |
|---|---|---|
| 92084 | Vista, CA | 4.3 mi |
| 92057 | Oceanside, CA | 5.5 mi |
| 92083 | Vista, CA | 6.7 mi |
| 92028 | Fallbrook, CA | 7 mi |
| 92026 | Escondido, CA | 7.3 mi |
| 92056 | Oceanside, CA | 7.8 mi |
| 92069 | San Marcos, CA | 8.1 mi |
| 92058 | Oceanside, CA | 8.2 mi |
| 92081 | Vista, CA | 8.8 mi |
| 92010 | Carlsbad, CA | 10.2 mi |
| 92059 | Pala, CA | 10.8 mi |
| 92054 | Oceanside, CA | 11 mi |
Questions about 92003
What is the ZIP+4 code for 92003?
92003 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 92003, you need to look up a specific street address to get them.
What city is 92003?
92003 is assigned to Bonsall, 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.