NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 605-294 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | CLAREMONT | SD |
| — | 605-298 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | ANDOVER | SD |
| — | 605-329 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | FREDERICK | SD |
| — | 605-382 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | CONDE | SD |
| — | 605-395 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | FERNEY | SD |
| — | 605-396 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | COLUMBIA | SD |
| — | 605-397 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | GROTON | SD |
| — | 605-492 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | BRISTOL | SD |
| — | 605-635 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | DOLAND | SD |
| — | 605-885 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | HOUGHTON | SD |
| — | 605-887 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | MELLETTE | SD |
| — | 605-897 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | TURTON | SD |
| — | 605-994 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | HECLA | SD |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.