| District ID | 28th District |
| Representative | Henry Cuellar |
| Party Affiliation | Democrat |
| Partisan Voting Index (PVI) | D+9 |
| 78591 |
| 78588 |
| 78584 |
| 78582 |
| 78564 |
| 78548 |
| 78547 |
| 78536 |
| 78384 |
| 78376 |
| 78371 |
| 78369 |
| 78361 |
| 78360 |
| 78357 |
| 78349 |
| 78344 |
| 78341 |
| 78332 |
| 78264 |
| 78263 |
| 78235 |
| 78233 |
| 78223 |
| 78222 |
| 78221 |
| 78220 |
| 78219 |
| 78214 |
| 78210 |
| 78205 |
| 78203 |
| 78202 |
| 78155 |
| 78154 |
| 78152 |
| 78150 |
| 78148 |
| 78130 |
| 78124 |
| 78123 |
| 78121 |
| 78118 |
| 78114 |
| 78113 |
| 78112 |
| 78109 |
| 78108 |
| 78101 |
| 78076 |
| 78073 |
| 78072 |
| 78069 |
| 78067 |
| 78065 |
| 78064 |
| 78052 |
| 78046 |
| 78045 |
| 78044 |
| 78043 |
| 78041 |
| 78040 |
| 78026 |
| 78012 |
| 78011 |
| 78008 |
| 78007 |
| 78005 |