18 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 77573 | League City | 95,704 |
| 77546 | Friendswood | 53,830 |
| 77539 | Dickinson | 47,240 |
| 77590 | Texas City | 33,347 |
| 77550 | Galveston | 23,215 |
| 77551 | Galveston | 22,521 |
| 77568 | La Marque | 20,417 |
| 77591 | Texas City | 15,914 |
| 77510 | Santa Fe | 13,506 |
| 77563 | Hitchcock | 10,382 |
| 77518 | Bacliff | 10,313 |
| 77554 | Galveston | 9,825 |
| 77565 | Kemah | 6,493 |
| 77517 | Santa Fe | 6,160 |
| 77650 | Port Bolivar | 2,073 |
| 77623 | High Island | 515 |
| 77617 | Gilchrist | 38 |
| 77555 | Galveston | 3 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 18 ZCTAs in Galveston County, Texas (US Census).