13 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| League City | 1 | 120,354 | 114,659 | 0.79% | 2,343 | 51 | City |
| Texas City | 2 | 60,669 | 52,286 | 2.36% | 916 | 66 | City |
| Galveston | 3 | 53,481 | 53,652 | -0.05% | 1,303 | 41 | City |
| Friendswood | 4 | 41,423 | 41,027 | 0.16% | 2,010 | 21 | City |
| Dickinson | 5 | 22,177 | 21,468 | 0.53% | 2,225 | 10 | City |
| La Marque | 6 | 21,061 | 18,460 | 2.1% | 1,530 | 14 | City |
| Santa Fe | 7 | 13,319 | 12,754 | 0.71% | 784 | 17 | City |
| Hitchcock | 8 | 7,973 | 7,309 | 1.41% | 132 | 60 | City |
| Kemah | 9 | 3,374 | 1,811 | 8.38% | 1,840 | 2 | City |
| Bayou Vista | 10 | 1,763 | 1,763 | 0% | 5,562 | 0 | City |
| Clear Lake Shores | 11 | 1,301 | 1,279 | 0.31% | 2,991 | 0 | City |
| Tiki Island | 12 | 1,124 | 1,112 | 0.18% | 2,361 | 0 | Village |
| Jamaica Beach | 13 | 1,076 | 1,079 | 0% | 1,852 | 1 | City |
League City is the largest city in Galveston County, with a population of 120,354.
Jamaica Beach is the smallest city in Galveston County, with a population of 1,076.
There are 13 cities in Galveston County, Texas.