Phone numbers in Hammond, Indiana
Hammond has 27 phone prefixes in area code 219.
Biggest holders: AT&T (local phone), AT&T Mobility, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 30%
- Local phone company 41%
- Internet / business phone carrier 22%
- Phone company 7%
Every prefix in Hammond
Search the first six digits of a number in this list. If it's here, the number started in Hammond with the carrier shown. If it isn't, check the Indiana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 219-218 | AT&T Mobility | Mobile carrier | 2001 |
| 219-228 | AT&T Mobility | Mobile carrier | 2002 |
| 219-230 | First Communications | Phone company | 2002 |
| 219-264 | AT&T Mobility | Mobile carrier | 2020 |
| 219-339 | Onvoy | Internet / business phone carrier | 2023 |
| 219-368 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 219-385 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 219-407 | Teleport Communications America | Internet / business phone carrier | 2016 |
| 219-408 | AT&T Mobility | Mobile carrier | 2024 |
| 219-426 | TON80 Communications | Internet / business phone carrier | 2022 |
| 219-501 | AT&T Enterprises | Phone company | 2015 |
| 219-529 | Fractel | Internet / business phone carrier | 2020 |
| 219-554 | AT&T (local phone) | Local phone company | – |
| 219-629 | AT&T Mobility | Mobile carrier | – |
| 219-666 | Onvoy | Internet / business phone carrier | 2017 |
| 219-670 | AT&T Mobility | Mobile carrier | – |
| 219-802 | CenturyLink / Lumen | Local phone company | 2013 |
| 219-803 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 219-844 | AT&T (local phone) | Local phone company | – |
| 219-845 | AT&T (local phone) | Local phone company | – |
| 219-852 | AT&T (local phone) | Local phone company | – |
| 219-853 | AT&T (local phone) | Local phone company | – |
| 219-931 | AT&T (local phone) | Local phone company | – |
| 219-932 | AT&T (local phone) | Local phone company | – |
| 219-933 | AT&T (local phone) | Local phone company | – |
| 219-937 | AT&T (local phone) | Local phone company | – |
| 219-989 | AT&T (local phone) | Local phone company | – |
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.