DOWNEY — CA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER CALIFORNIA INC. | 2319 | 15 |
| T-MOBILE USA, INC. | 6529 | 15 |
| METROPCS NETWORKS, LLC | 899D | 10 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 6 |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 6 |