Phone numbers in Brookings, South Dakota
Brookings has 11 phone prefixes in area code 605.
Biggest holders: City Of Brookings Municipal Tel. Dept, AT&T Mobility, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 64%
- Phone company 36%
Every prefix in Brookings
Search the first six digits of a number in this list. If it's here, the number started in Brookings with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-320 | AT&T Mobility | Mobile carrier | 2025 |
| 605-592 | AT&T Mobility | Mobile carrier | 2009 |
| 605-651 | Verizon Wireless | Mobile carrier | – |
| 605-688 | City Of Brookings Municipal Tel. Dept | Phone company | – |
| 605-690 | AT&T Mobility | Mobile carrier | – |
| 605-691 | T-Mobile (including Sprint) | Mobile carrier | – |
| 605-692 | City Of Brookings Municipal Tel. Dept | Phone company | – |
| 605-695 | Verizon Wireless | Mobile carrier | – |
| 605-696 | City Of Brookings Municipal Tel. Dept | Phone company | – |
| 605-697 | City Of Brookings Municipal Tel. Dept | Phone company | – |
| 605-736 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.