HILL CITY — SD
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| TON80 COMMUNICATIONS, LLC | 516J | 1 |
| AIRUS, INC. - SD | 580H | 1 |
| QWEST CORPORATION | 9631 | 1 |
Data last updated: March 10, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| TON80 COMMUNICATIONS, LLC | 516J | 1 |
| AIRUS, INC. - SD | 580H | 1 |
| QWEST CORPORATION | 9631 | 1 |