Area Codes
| 341 | California This Area code is scheduled to provide numbering relief for Area code 510 but no date has been assigned for this to go into effect. | More information at: Area Code 341 Phone Number Blocks
| 341 | California This Area code is scheduled to provide numbering relief for Area code 510 but no date has been assigned for this to go into effect. | More information at: Area Code 341 Phone Number Blocks