ZIP Code 91342 — Sylmar, CA
91342 is a standard (street delivery) ZIP code serving Sylmar, California, in Los Angeles 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 91342 at a glance
| ZIP code | 91342 |
|---|---|
| Primary city | Sylmar |
| State | California (CA) |
| County | Los Angeles FIPS 06037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 93,301 |
| Coordinates | 34.317780, -118.392070 |
How ZIP+4 works in 91342
The four digits after the hyphen encode a delivery segment inside 91342. 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 91342 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 91342.
| ZIP | City | Distance |
|---|---|---|
| 91340 | San Fernando, CA | 3.2 mi |
| 91331 | Pacoima, CA | 4.5 mi |
| 91040 | Sunland, CA | 5.2 mi |
| 91345 | Mission Hills, CA | 5.3 mi |
| 91387 | Canyon Country, CA | 5.6 mi |
| 91352 | Sun Valley, CA | 6.1 mi |
| 91321 | Newhall, CA | 6.6 mi |
| 91344 | Granada Hills, CA | 6.7 mi |
| 91402 | Panorama City, CA | 7.1 mi |
| 91343 | North Hills, CA | 7.5 mi |
| 91042 | Tujunga, CA | 7.7 mi |
| 91605 | North Hollywood, CA | 7.7 mi |
Questions about 91342
What is the ZIP+4 code for 91342?
91342 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 91342, you need to look up a specific street address to get them.
What city is 91342?
91342 is assigned to Sylmar, California, in Los Angeles 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.