CASTLEWOOD — SD
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| INTERSTATE TELECOM COOP, INC. - SD | 1651 | 1 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | 6569 | 1 |
| MCC TELEPHONY OF THE MID-WEST, LLC - SD | 920F | 1 |
Data last updated: June 25, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| INTERSTATE TELECOM COOP, INC. - SD | 1651 | 1 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | 6569 | 1 |
| MCC TELEPHONY OF THE MID-WEST, LLC - SD | 920F | 1 |