First three digits · California
ZIP Codes Starting with
25 ZIP codes start with 910, sorted at the Santa Clarita, CA (SCF 913) sectional center (USPS labeling list L005, effective October 1, 2026) in California: 13 residential ZIP codes across 1 county and 12 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 910 mean?
The first digit, 9, is one of ten national areas (Alaska, California, Hawaii, Oregon, Washington, American Samoa, Guam, Northern Mariana Islands, Marshall Islands, Micronesia, Palau and Armed Forces Pacific). The first three, 910, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 910 to the Santa Clarita, CA (SCF 913) facility. The last two digits pick the delivery area. By residents, the largest town names among the 910 ZIP codes are Arcadia, Monrovia, Altadena, Duarte, Tujunga and South Pasadena.
The same facility sorts 7 prefixes, 190 ZIP codes in all: 910, 911, 912, 913, 914, 915, 916.
Where are the 910 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 910
| County | ||||||
|---|---|---|---|---|---|---|
| 91001 | Altadena | Los Angeles County | 35,475 | 4,295 | $135k | $1.14M |
| 91003 | Altadena | Los Angeles County | PO Box or unique | – | – | – |
| 91006 | Arcadia | Los Angeles County | 31,582 | 4,912 | $124k | $1.26M |
| 91007 | Arcadia | Los Angeles County | 33,029 | 6,000 | $101k | $1.28M |
| 91008 | Duarte | Los Angeles County | 743 | 386 | $164k | $1.81M |
| 91009 | Duarte | Los Angeles County | PO Box or unique | – | – | – |
| 91010 | Duarte | Los Angeles County | 27,589 | 4,290 | $103k | $757k |
| 91011 | La Canada Flintridge | Los Angeles County | 19,935 | 1,770 | $242k | $2M+ |
| 91012 | La Canada Flintridge | Los Angeles County | PO Box or unique | – | – | – |
| 91016 | Monrovia | Los Angeles County | 41,140 | 4,853 | $97k | $897k |
| 91017 | Monrovia | Los Angeles County | PO Box or unique | – | – | – |
| 91020 | Montrose | Los Angeles County | 7,532 | 10,490 | $72k | $911k |
| 91021 | Montrose | Los Angeles County | PO Box or unique | – | – | – |
| 91023 | Mount Wilson | Los Angeles County | PO Box or unique | – | – | – |
| 91024 | Sierra Madre | Los Angeles County | 10,940 | 3,130 | $144k | $1.23M |
| 91025 | Sierra Madre | Los Angeles County | PO Box or unique | – | – | – |
| 91030 | South Pasadena | Los Angeles County | 26,068 | 7,596 | $127k | $1.64M |
| 91031 | South Pasadena | Los Angeles County | PO Box or unique | – | – | – |
| 91040 | Sunland | Los Angeles County | 20,821 | 2,503 | $98k | $862k |
| 91041 | Sunland | Los Angeles County | PO Box or unique | – | – | – |
| 91042 | Tujunga | Los Angeles County | 26,928 | 541 | $86k | $841k |
| 91043 | Tujunga | Los Angeles County | PO Box or unique | – | – | – |
| 91046 | Verdugo City | Los Angeles County | 115 | 23,000 | – | – |
| 91066 | Arcadia | Los Angeles County | PO Box or unique | – | – | – |
| 91077 | Arcadia | Los Angeles County | PO Box or unique | – | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.