| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| League City | 1 | 120,814 | 114,629 | 0.76% | 2,352 | 51 | City |
| Texas City | 2 | 61,143 | 52,249 | 2.36% | 923 | 66 | City |
| Galveston | 3 | 53,623 | 53,657 | -0.02% | 1,307 | 41 | City |
| Friendswood | 4 | 41,372 | 41,018 | 0.13% | 2,007 | 21 | City |
| Dickinson | 5 | 22,022 | 21,451 | 0.52% | 2,210 | 10 | City |
| La Marque | 6 | 20,760 | 18,464 | 2.15% | 1,509 | 14 | City |
| Santa Fe | 7 | 14,010 | 12,733 | 0.7% | 825 | 17 | City |
| Hitchcock | 8 | 7,831 | 7,311 | 1.41% | 130 | 60 | City |
| Kemah | 9 | 3,355 | 1,812 | 8.33% | 1,829 | 2 | City |
| Bayou Vista | 10 | 1,755 | 1,762 | 0% | 5,536 | 0 | City |
| Clear Lake Shores | 11 | 1,302 | 1,285 | 0.31% | 2,993 | 0 | City |
| Tiki Island | 12 | 1,120 | 1,112 | 0.09% | 2,353 | 0 | Village |
| Jamaica Beach | 13 | 1,070 | 1,079 | -0.09% | 1,842 | 1 | City |
League City is the largest city in Galveston County, with a population of 120,814.
Jamaica Beach is the smallest city in Galveston County, with a population of 1,070.
There are 13 cities in Galveston County, Texas.