18 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 77573 | League City | 98,109 |
| 77546 | Friendswood | 54,789 |
| 77539 | Dickinson | 49,375 |
| 77590 | Texas City | 31,642 |
| 77550 | Galveston | 23,489 |
| 77568 | La Marque | 23,083 |
| 77551 | Galveston | 21,696 |
| 77591 | Texas City | 18,294 |
| 77510 | Santa Fe | 14,155 |
| 77554 | Galveston | 10,414 |
| 77563 | Hitchcock | 9,955 |
| 77518 | Bacliff | 9,541 |
| 77565 | Kemah | 6,943 |
| 77517 | Santa Fe | 5,529 |
| 77650 | Port Bolivar | 2,322 |
| 77623 | High Island | 585 |
| 77617 | Gilchrist | 44 |
| 77555 | Galveston | 2 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 18 ZCTAs in Galveston County, Texas (US Census).