HILLSDALE prefixes in area code 517
NANPA records 15 assigned NXX blocks to rate center HILLSDALE in area code 517, 2.4% of the 616 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 8 holders hold those blocks, the largest being CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI (4), NEW CINGULAR WIRELESS PCS, LLC - IL (3), MICHIGAN BELL TEL CO (3). The earliest assignment on record here is 2001-10-22 and the most recent 2026-04-27. 8 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 309, 518, 580, 615 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 517-212 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 2004-04-16 | yes | yes |
| 517-297 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2021-09-03 | yes | yes |
| 517-320 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | – | no | yes |
| 517-387 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2026-04-27 | yes | yes |
| 517-398 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | yes | yes |
| 517-425 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | – | yes | yes |
| 517-437 | AT&T MICHIGAN BELL TEL CO | – | no | yes |
| 517-439 | AT&T MICHIGAN BELL TEL CO | – | no | yes |
| 517-607 | AT&T MICHIGAN BELL TEL CO | – | yes | yes |
| 517-610 | T-Mobile OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2002-06-26 | yes | yes |
| 517-689 | INTERACTIVE SERVICES NETWORK, INC. | 2001-11-13 | no | yes |
| 517-797 | Windstream PAETEC ITEL, LLC | 2001-10-22 | yes | yes |
| 517-825 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | – | no | yes |
| 517-828 | 123.NET, LLC | 2002-08-12 | no | yes |
| 517-964 | ACD TELECOM, INC. - MI | 2001-10-30 | no | yes |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | Verizon | 4 | 26.7% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 3 | 20% |
| MICHIGAN BELL TEL CO | AT&T | 3 | 20% |
| OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | T-Mobile | 1 | 6.7% |
| INTERACTIVE SERVICES NETWORK, INC. | – | 1 | 6.7% |
| PAETEC ITEL, LLC | Windstream | 1 | 6.7% |
| 123.NET, LLC | – | 1 | 6.7% |
| ACD TELECOM, INC. - MI | – | 1 | 6.7% |
Frequently asked
Which prefixes belong to HILLSDALE in area code 517?
15 blocks: 212, 297, 320, 387, 398, 425, 437, 439, 607, 610, 689, 797 and 3 more, all listed in the table above.
Which carriers have numbers in HILLSDALE?
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI (4 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (3 blocks), MICHIGAN BELL TEL CO (3 blocks), OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC (1 block), INTERACTIVE SERVICES NETWORK, INC. (1 block), PAETEC ITEL, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is HILLSDALE a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.