Zip code 91023: Mount Wilson, California
This zip has no delivery boundary. The map shows its post office location and nearby zip codes.
About 91023
91023 is a non-residential zip code for Mount Wilson, 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 91023, see the residential zip codes in the nearby list below.
Geography
- City (USPS)
- Mount Wilson
- State
- California
- County
- Los Angeles County
- Center point
- 34.2264° N, 118.0662° W
- Time zone
- Pacific Time (UTC-8, UTC-7 in summer)
- Zip type
- PO box or unique zip
Zip codes near 91023
| Zip | City | Distance | IncomeMedian income |
|---|---|---|---|
| 91024 | Sierra Madre, CA | 3.7 mi | $143,547 |
| 91003 | Altadena, CA · PO box | 4.5 mi | — |
| 91025 | Sierra Madre, CA · PO box | 4.5 mi | — |
| 91001 | Altadena, CA | 4.7 mi | $134,903 |
| 91107 | Pasadena, CA | 4.8 mi | $126,449 |
| 91104 | Pasadena, CA | 5.3 mi | $105,958 |
| 91066 | Arcadia, CA · PO box | 6.2 mi | — |
| 91077 | Arcadia, CA · PO box | 6.2 mi | — |
| 91016 | Monrovia, CA | 6.3 mi | $96,540 |
| 91017 | Monrovia, CA · PO box | 6.6 mi | — |
| 91006 | Arcadia, CA | 6.7 mi | $123,533 |
| 91007 | Arcadia, CA | 6.9 mi | $100,705 |
Questions about 91023
What city is zip code 91023?
91023 is assigned to Mount Wilson, California. The city name is the one the Postal Service prefers for mail addressed to this zip code.
What county is 91023 in?
91023 is in Los Angeles County, California.
What time zone is 91023 in?
91023 is in Pacific Time.
What zip codes are near 91023?
The closest zip codes to 91023 are 91024, 91003, 91025, 91001, 91107.
Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 91023, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.