| Zip Code | City | Population ↓ |
|---|---|---|
| 76706 | Waco | 40,770 |
| 76705 | Waco | 31,985 |
| 76712 | Woodway | 28,758 |
| 76708 | Waco | 26,917 |
| 76710 | Waco | 23,008 |
| 76707 | Waco | 16,516 |
| 76643 | Hewitt | 16,034 |
| 76657 | Mcgregor | 12,160 |
| 76711 | Waco | 9,474 |
| 76655 | Lorena | 8,591 |
| 76704 | Waco | 7,450 |
| 76633 | China Spring | 6,348 |
| 76691 | West | 6,315 |
| 76638 | Crawford | 3,106 |
| 76640 | Elm Mott | 2,953 |
| 76798 | Waco | 2,907 |
| 76624 | Axtell | 2,587 |
| 76630 | Bruceville | 1,953 |
| 76701 | Waco | 1,861 |
| 76654 | Leroy | 173 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in McLennan County, Texas (US Census).