| 911 Emergency | | 911 |
| Byron Intermediate School | | 925-634-2128 |
| California Highway Patrol | | 1-888-301-4247 |
| Comcast Cable Services | | 925-634-3583 |
| Contra Costa County Sheriff | | 925-646-2441 |
| Discovery Bay Athletic Club | | 925-634-1210 |
| Discovery Bay Chamber of Commerce | | 1-888-832-3291 |
| Discovery Bay Country Club | | 925-634-0700 |
| Discovery Bay Disposal Service | | 925-634-3099 |
| Discovery Bay Marina Harbor Master | | 925-634-5928 |
| Discovery Bay Property Owners Association | | 925-634-7585 |
| Discovery Bay School | | 925-634-2159 |
| Discovery Bay Sewer and Water | | 925-634-8818 |
| Discovery Bay Yacht Club | | 925-634-1210 |
| Excelsior Middle School | | 925-240-7356 |
| Fire Department | | 925-634-3400 |
| Liberty Union High School | | 925-634-2166 |
| PG&E Customer Service | | 1-800-743-5000 |
| Reclamation 800 Water District | | 925-634-2351 |
| SBC Customer Service | | 1-800-310-2355 |
| Timber Point Elementary School | | 925-634-4369 |
| Town of Discovery Bay | | 925-634-1131 |
| U.S. Post Office, Discovery Bay Station | | 925-634-2600 |
| Wall Street Journal | | 800-975-8609 |
