18 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 77573 | League City | 97,871 |
| 77546 | Friendswood | 54,082 |
| 77539 | Dickinson | 47,164 |
| 77590 | Texas City | 33,145 |
| 77550 | Galveston | 23,542 |
| 77551 | Galveston | 22,031 |
| 77568 | La Marque | 21,118 |
| 77591 | Texas City | 16,840 |
| 77510 | Santa Fe | 13,938 |
| 77563 | Hitchcock | 10,212 |
| 77554 | Galveston | 9,973 |
| 77518 | Bacliff | 9,935 |
| 77565 | Kemah | 6,583 |
| 77517 | Santa Fe | 5,665 |
| 77650 | Port Bolivar | 2,362 |
| 77623 | High Island | 595 |
| 77617 | Gilchrist | 38 |
| 77555 | Galveston | 2 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 18 ZCTAs in Galveston County, Texas (US Census).