Look up any phone number starting with 858 to identify the owner name, address, spam reports, and more. The 858 area code is a telephone area code serving most of San Diego County in California.
Enter a full 10-digit number to identify the caller and whether it has been reported as spam.
Federal Data
State Data
County Data
City Data
Phone numbers with the 858 area code originate from areas within San Diego County, including areas that were initially designated as northwest San Diego County.
Area code 858 is part of an overlay complex with area code 619 . Area code 619 was created in 1982, and 858 was introduced in 1999. In June 2018, the boundary between 619 and 858 was eliminated, making them overlay area codes. Ten-digit local dialing became mandatory at that time.
Area code 858 is a general purpose code which was placed in service on June 12, 1999.
Our California phone number lookup for the 858 area code analyzes the three-digit prefix to identify the initially assigned telecommunications company and rate center. This prefix code data may help to determine the U.S. carrier, California geographic region, and local calling area associated with the phone number.
Phone numbers follow the following structure under the North American Numbering Plan:
Understanding the area code can help you determine if a call is local to your area. However, keep in mind that due to mobile number portability and VoIP services, the caller may be anywhere in the United States, so it’s best to search for the most recent phone number details.
| Company | Number of Prefixes |
|---|---|
| PACIFIC BELL | 141 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 21 |
| NEW CINGULAR WIRELESS PCS, LLC | 20 |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 18 |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 17 |
| SPRINT SPECTRUM, L.P. | 15 |
| XO CALIFORNIA, INC. | 15 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 13 |
| T-MOBILE USA, INC. | 12 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 10 |
| ONVOY, LLC - CA | 10 |
| COMCAST IP PHONE, LLC | 9 |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 7 |
| O1 COMMUNICATIONS, INC. - CA | 6 |
| PAETEC COMMUNICATIONS, INC. - CA | 6 |
| AT&T - LOCAL | 4 |
| BANDWIDTH.COM CLEC, LLC - CA | 4 |
| GLOBAL CROSSING LOCAL SERVICES, INC. - CA | 4 |
| MATRIX TELECOM, LLC. S/I/I TNCI - CA | 4 |
| TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB | 2 |
| YMAX COMMUNICATIONS CORP. - CA | 2 |
| AMERICAN MESSAGING SERVICES, LLC | 1 |
| AT&T CORP. | 1 |
| LOCAL ACCESS SERVICES LLC - CA | 1 |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 1 |
| TERRA NOVA TELECOM INC. | 1 |
| TON80 COMMUNICATIONS, LLC | 1 |
Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.
| Rate Center | Number of Prefixes |
|---|---|
| LA JOLLA | 128 |
| SNDG LVTA | 56 |
| SNDG MRMS | 46 |
| POWAY | 33 |
| DEL MAR | 32 |
| RNCHOBRNDO | 29 |
| RNCHOPNQTS | 13 |
| RNCHOSANFE | 8 |
| SNDG SNDG | 1 |
Browse California area codes for phone number lookup: