ZIP code 91310
Where is ZIP code 91310?
Castaic, California
Los Angeles County · PO Box only ZIP code
ZIP code 91310 belongs to Castaic, California in Los Angeles County. 91310 is a PO Box only ZIP code: it is used for post office boxes at the Castaic post office, not for street addresses. It is in the Pacific Time zone and uses area code 661. The closest ZIP codes are 91384 (Castaic, 0.5 mi south), 91385 (Valencia, 3.2 mi south) and 91354 (Valencia, 5.7 mi southeast).
| ZIP code | 91310 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Castaic |
| Also accepted | Santa Clarita |
| State | California (CA) |
| County | Los Angeles County |
| Time zone | Pacific Time · now |
| Area code | 661 |
| Coordinates | 34.4889, -118.6229 map |
| 3-digit prefix | 913 |
The Census Bureau doesn’t publish population figures for po box only ZIP codes because nobody lives at a PO Box or a single organization’s address. For figures about the area, see the nearby standard ZIP codes below.
ZIP codes near 91310
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 91384 | Castaic, CA | 0.5 mi S | Standard |
| 91385 | Valencia, CA | 3.2 mi S | PO Box only |
| 91354 | Valencia, CA | 5.7 mi SE | Standard |
| 91390 | Santa Clarita, CA | 5.7 mi E | Standard |
| 91355 | Valencia, CA | 7.4 mi SE | Standard |
| 91381 | Stevenson Ranch, CA | 7.7 mi S | Standard |
| 91350 | Santa Clarita, CA | 7.9 mi SE | Standard |
| 91380 | Santa Clarita, CA | 8.1 mi SE | PO Box only |
| 91382 | Santa Clarita, CA | 8.1 mi SE | Standard |
| 91383 | Santa Clarita, CA | 8.1 mi SE | Standard |
| 91322 | Newhall, CA | 8.9 mi SE | PO Box only |
| 91321 | Newhall, CA | 9.5 mi SE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 91310 or measure the distance to another ZIP code.
How to address mail to 91310
PO BOX 123
CASTAIC CA 91310
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts SANTA CLARITA as the city name for 91310. Adding the 4-digit ZIP+4 code (91310-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Castaic, CA
All Castaic ZIP codes with population and income →
Questions
- What city is ZIP code 91310?
- 91310 is a Castaic, California ZIP code. Santa Clarita is also accepted as the city name.
- What county is 91310 in?
- ZIP code 91310 is in Los Angeles County, California.
- What time zone is ZIP code 91310 in?
- 91310 is in the Pacific Time zone (America/Los_Angeles).
- What area code is 91310?
- Phone numbers in ZIP code 91310 use area code 661.
- Can I use 91310 for a street address?
- No. 91310 is only for PO Boxes. Street addresses in Castaic use 91384.
- What ZIP codes are near 91310?
- The nearest ZIP codes to 91310 are 91384 (Castaic, 0.5 miles), 91385 (Valencia, 3.2 miles), 91354 (Valencia, 5.7 miles) and 91390 (Santa Clarita, 5.7 miles).