MONONA — IA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| NORTHEAST IOWA TEL. CO. | 1230 | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |
Data last updated: June 25, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| NORTHEAST IOWA TEL. CO. | 1230 | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |