COLUMBIA — WA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA | 4521 | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | 1 |
Data last updated: March 10, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA | 4521 | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | 1 |