GRAND RIVER MUTUAL TEL CO
36 prefixes in 660 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 660-244 | PURDIN | 1888 | — | — |
| 660-286 | LAREDO | 1888 | — | — |
| 660-326 | DENVER | 1888 | — | — |
| 660-382 | MERCER | 1888 | — | — |
| 660-425 | BETHANY | 1888 | — | — |
| 660-426 | BETHANY | 1888 | — | Yes |
| 660-439 | NEWHAMPTON | 1888 | — | — |
| 660-448 | GENTRY | 1888 | — | — |
| 660-485 | SPICKARD | 1888 | — | — |
| 660-592 | POWERSVL | 1888 | — | — |
| 660-639 | CHULA | 1888 | — | — |
| 660-652 | BARNARD | 1888 | — | — |
| 660-666 | DARLINGTON | 1888 | — | — |
| 660-673 | GALT | 1888 | — | — |
| 660-684 | JAMESPORT | 1888 | — | Yes |
| 660-735 | SODAVIS CY | 1888 | — | — |
| 660-748 | PRINCETON | 1888 | — | — |
| 660-789 | BRIMSON | 1888 | — | — |
| 660-793 | LUCERNE | 1888 | — | — |
| 660-794 | NEWTOWN | 1888 | — | — |
| 660-799 | SHERIDAN | 1888 | — | — |
| 660-824 | MT MORIAH | 1888 | — | — |
| 660-845 | WASHITNCTR | 1888 | — | — |
| 660-867 | EAGLEVILLE | 1888 | — | — |
| 660-872 | RIDGEWAY | 1888 | — | — |
| 660-875 | SO LINEVL | 1888 | — | — |
| 660-876 | GILMANCITY | 1888 | — | — |
| 660-878 | ANDOVER | 1888 | — | — |
| 660-893 | CAINSVILLE | 1888 | — | — |
| 660-895 | LINNEUS | 1888 | — | — |
| 660-937 | RAVENWOOD | 1888 | — | — |
| 660-938 | MEADVILLE | 1888 | — | — |
| 660-939 | GRAHAM | 1888 | — | — |
| 660-944 | CONCETNJCT | 1888 | — | — |
| 660-946 | BROWNING | 1888 | — | — |
| 660-986 | PARNELL | 1888 | — | — |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.