ZIP Code 91903 is located in Alpine California. 91903 is entirely within San Diego County. Regionally, 91903 is located in Metro San Diego.
| ZIP Code Name | Alpine |
| Primary County | San Diego County |
| ZIP Code Type | PO Box |
| Current Time | PDT |
| Coordinates | 32.83522415,-116.76802063 |
| Adjacent ZIP Codes | |
| Region | Metro San Diego |
| Metropolitan/Micropolitan Stat Area | San Diego-Chula Vista-Carlsbad, CA |
| Time Zone | Pacific Daylight Time |
| IANA Timezone | America/Los_Angeles |
| School Districts in 91903 | |
| High Schools in 91903 |