Zip code 91310: Castaic, California
This zip has no delivery boundary. The map shows its post office location and nearby zip codes.
About 91310
91310 is a non-residential zip code for Castaic, California (Los Angeles County). It has no delivery area of its own, so the Census Bureau doesn't publish population or housing figures for it. Codes like this are usually assigned to post office boxes, or to a single organization such as a university, hospital, government agency or large company that gets enough mail to need its own zip code.
For a picture of the people who live around 91310, see the residential zip codes in the nearby list below.
Geography
- City (USPS)
- Castaic
- State
- California
- County
- Los Angeles County
- Center point
- 34.4889° N, 118.6229° W
- Time zone
- Pacific Time (UTC-8, UTC-7 in summer)
- Zip type
- PO box or unique zip
Zip codes near 91310
| Zip | City | Distance | IncomeMedian income |
|---|---|---|---|
| 91385 | Valencia, CA · PO box | 3.2 mi | — |
| 91384 | Castaic, CA | 3.4 mi | $131,689 |
| 91354 | Valencia, CA | 4.4 mi | $156,173 |
| 91355 | Valencia, CA | 6.7 mi | $115,640 |
| 91350 | Santa Clarita, CA | 7.9 mi | $140,110 |
| 91381 | Stevenson Ranch, CA | 8 mi | $158,504 |
| 91380 | Santa Clarita, CA · PO box | 8.1 mi | — |
| 91382 | Santa Clarita, CA · PO box | 8.1 mi | — |
| 91383 | Santa Clarita, CA · PO box | 8.1 mi | — |
| 91322 | Newhall, CA · PO box | 8.9 mi | — |
| 91390 | Santa Clarita, CA | 9.6 mi | $151,897 |
| 91386 | Canyon Country, CA · PO box | 9.7 mi | — |
Questions about 91310
What city is zip code 91310?
91310 is assigned to Castaic, California. The city name is the one the Postal Service prefers for mail addressed to this zip code.
What county is 91310 in?
91310 is in Los Angeles County, California.
What time zone is 91310 in?
91310 is in Pacific Time.
What zip codes are near 91310?
The closest zip codes to 91310 are 91385, 91384, 91354, 91355, 91350.
Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 91310, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.