MADISON — SD
Data last updated: October 30, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | 6569 | 2 |
| QWEST CORPORATION | 9631 | 2 |
| BANDWIDTH.COM CLEC, LLC - SD | 106F | 1 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |
| MIDCONTINENT COMMUNICATIONS. - SD | 7076 | 1 |