16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| League City | 1 | 119,405 | 114,659 | 0.8% | 2,325 | 51 | City |
| Texas City | 2 | 59,272 | 52,286 | 2.41% | 894 | 66 | City |
| Galveston | 3 | 53,509 | 53,652 | -0.05% | 1,304 | 41 | City |
| Friendswood | 4 | 41,357 | 41,027 | 0.16% | 2,006 | 21 | City |
| Dickinson | 5 | 22,059 | 21,468 | 0.54% | 2,214 | 10 | City |
| La Marque | 6 | 20,627 | 18,460 | 2.14% | 1,499 | 14 | City |
| Santa Fe | 7 | 13,225 | 12,754 | 0.72% | 779 | 17 | City |
| Bacliff | 8 | 10,736 | 11,513 | 1.33% | 4,223 | 3 | CDP |
| Hitchcock | 9 | 7,862 | 7,309 | 1.42% | 130 | 60 | City |
| San Leon | 10 | 5,894 | 5,439 | 1.06% | 1,241 | 5 | CDP |
| Kemah | 11 | 3,113 | 1,811 | 9.11% | 1,697 | 2 | City |
| Bolivar Peninsula | 12 | 2,678 | 2,611 | 0.64% | 63 | 42 | CDP |
| Bayou Vista | 13 | 1,763 | 1,763 | 0% | 5,562 | 0 | City |
| Clear Lake Shores | 14 | 1,297 | 1,279 | 0.23% | 2,982 | 0 | City |
| Tiki Island | 15 | 1,122 | 1,112 | 0.18% | 2,357 | 0 | Village |
| Jamaica Beach | 16 | 1,076 | 1,079 | -0.09% | 1,852 | 1 | City |
League City is the largest city in Galveston County, with a population of 119,405.
Jamaica Beach is the smallest city in Galveston County, with a population of 1,076.
There are 16 cities in Galveston County, Texas.