ZIP Code 93440 — Los Alamos, CA
93440 is a standard (street delivery) ZIP code serving Los Alamos, California, in Santa Barbara 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 93440 at a glance
| ZIP code | 93440 |
|---|---|
| Primary city | Los Alamos |
| State | California (CA) |
| County | Santa Barbara FIPS 06083 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 1,185 |
| Coordinates | 34.746060, -120.252920 |
How ZIP+4 works in 93440
The four digits after the hyphen encode a delivery segment inside 93440. 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 93440 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 93440.
| ZIP | City | Distance |
|---|---|---|
| 93427 | Buellton, CA | 8.4 mi |
| 93441 | Los Olivos, CA | 8.9 mi |
| 93463 | Solvang, CA | 11.7 mi |
| 93436 | Lompoc, CA | 12.6 mi |
| 93455 | Santa Maria, CA | 13.2 mi |
| 93454 | Santa Maria, CA | 14 mi |
| 93437 | Lompoc, CA | 14.7 mi |
| 93429 | Casmalia, CA | 18.1 mi |
| 93458 | Santa Maria, CA | 19.7 mi |
| 93117 | Goleta, CA | 20.1 mi |
| 93460 | Santa Ynez, CA | 20.8 mi |
| 93434 | Guadalupe, CA | 24.4 mi |
Questions about 93440
What is the ZIP+4 code for 93440?
93440 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 93440, you need to look up a specific street address to get them.
What city is 93440?
93440 is assigned to Los Alamos, California, in Santa Barbara 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.