MADISON — SD
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | 6569 | 2 |
| QWEST CORPORATION | 9631 | 2 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |
| CLARITY TELECOM, LLC DBA BLUEPEAK | 7024 | 1 |
| MIDCONTINENT COMMUNICATIONS. - SD | 7076 | 1 |