EL SEGUNDO — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| PACIFIC BELL | 9740 | 24 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | 6 |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 4 |
| T-MOBILE USA, INC. | 6529 | 3 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | 3 |