T-MOBILE USA, INC.
42 prefixes in 331 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 331-200 | BARTLETT | 6529 | 2011-07-11 | Yes |
| 331-202 | ELMHURST | 6529 | 2012-01-17 | Yes |
| 331-203 | AURORA | 6529 | 2011-10-12 | Yes |
| 331-205 | AURORA | 6529 | 2011-10-21 | Yes |
| 331-206 | AURORA | 6529 | 2011-10-12 | Yes |
| 331-218 | WHEATON | 6529 | 2013-07-09 | Yes |
| 331-220 | AURORA | 6529 | 2011-07-12 | Yes |
| 331-225 | ELMHURST | 6529 | 2011-08-22 | Yes |
| 331-226 | NAPERVILLE | 6529 | 2017-03-20 | Yes |
| 331-230 | AURORA | 6529 | 2017-04-05 | Yes |
| 331-236 | WHEATON | 6529 | 2017-04-05 | Yes |
| 331-242 | LOMBARD | 6529 | 2018-10-19 | Yes |
| 331-243 | LOMBARD | 6529 | 2018-10-19 | Yes |
| 331-245 | BARTLETT | 6529 | 2013-04-18 | Yes |
| 331-246 | LEMONT | 6529 | 2018-10-19 | Yes |
| 331-250 | AURORA | 6529 | 2012-04-10 | Yes |
| 331-253 | LEMONT | 6529 | 2014-10-27 | Yes |
| 331-254 | SUGARGROVE | 6529 | 2014-07-16 | Yes |
| 331-261 | LEMONT | 6529 | 2019-06-20 | Yes |
| 331-262 | AURORA | 6529 | 2008-07-30 | Yes |
| 331-268 | SUGARGROVE | 6529 | 2021-01-14 | Yes |
| 331-269 | AURORA | 6529 | 2021-05-14 | Yes |
| 331-274 | AURORA | 6529 | 2021-08-03 | Yes |
| 331-275 | BARTLETT | 6529 | 2021-08-03 | Yes |
| 331-283 | GENEVA | 6529 | 2022-02-23 | Yes |
| 331-284 | BARTLETT | 6529 | 2022-03-11 | Yes |
| 331-289 | HINSDALE | 6529 | 2022-08-12 | Yes |
| 331-300 | AURORA | 6529 | 2016-03-17 | Yes |
| 331-304 | BARTLETT | 6529 | 2015-02-20 | Yes |
| 331-307 | LOMBARD | 6529 | 2014-10-13 | Yes |
| 331-321 | AURORA | 6529 | 2015-07-20 | Yes |
| 331-425 | AURORA | 6529 | 2007-07-11 | Yes |
| 331-472 | NAPERVILLE | 6529 | 2008-10-22 | Yes |
| 331-575 | AURORA | 6529 | 2007-09-18 | Yes |
| 331-643 | AURORA | 6529 | 2007-09-18 | Yes |
| 331-645 | ELMHURST | 6529 | 2007-11-05 | Yes |
| 331-703 | W CHICAGO | 6529 | 2013-10-24 | Yes |
| 331-707 | AURORA | 6529 | 2016-08-23 | Yes |
| 331-757 | LEMONT | 6529 | 2016-07-13 | Yes |
| 331-814 | NAPERVILLE | 6529 | 2015-06-25 | Yes |
| 331-826 | ELMHURST | 6529 | 2008-11-18 | Yes |
| 331-980 | AURORA | 6529 | 2014-10-13 | Yes |
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.