| Prefix/Exchange | Location |
|---|---|
| 346-200 | Houston |
| 346-201 | Houston |
| 346-204 | Houston |
| 346-208 | Houston |
| 346-209 | Houston |
| 346-212 | Houston |
| 346-215 | Houston |
| 346-216 | Houston |
| 346-217 | Houston |
| 346-218 | Houston |
| 346-221 | Houston |
| 346-222 | Houston |
| 346-224 | Houston |
| 346-225 | Houston |
| 346-228 | Houston |
| 346-231 | Houston |
| 346-234 | Houston |
| 346-240 | Houston |
| 346-247 | Houston |
| 346-248 | Houston |
| 346-301 | Houston |
| 346-303 | Houston |
| 346-304 | Houston |
| 346-305 | Houston |
| 346-307 | Houston |
| 346-308 | Houston |
| 346-309 | Houston |
| 346-331 | Houston |
| 346-401 | Houston |
| 346-444 | Houston |
| 346-571 | Houston |
| 346-600 | Houston |
| 346-666 | Houston |
| 346-701 | Houston |
| 346-703 | Houston |
| 346-704 | Houston |
| 346-720 | Houston |
| 346-721 | Houston |
| 346-722 | Houston |
| 346-723 | Houston |
| 346-725 | Houston |
| 346-726 | Houston |
| 346-727 | Houston |
| 346-728 | Houston |
| 346-729 | Houston |
| 346-772 | Houston |
| 346-800 | Houston |
| 346-802 | Houston |
| 346-808 | Houston |
| 346-834 | Houston |
| 346-900 | Houston |
| 346-901 | Houston |
| 346-932 | Houston |
| 346-971 | Houston |
| 346-980 | Houston |
| 346-999 | Houston |