16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| League City | 1 | 117,428 | 114,657 | 0.47% | 2,286 | 51.36 | City |
| Texas City | 2 | 59,490 | 52,287 | 2.48% | 898 | 66.27 | City |
| Galveston | 3 | 52,961 | 53,650 | -0.26% | 1,291 | 41.04 | City |
| Friendswood | 4 | 40,698 | 41,017 | -0.16% | 1,974 | 20.61 | City |
| Dickinson | 5 | 22,086 | 21,455 | 0.57% | 2,216 | 9.96 | City |
| La Marque | 6 | 20,371 | 18,456 | 1.92% | 1,480 | 13.76 | City |
| Santa Fe | 7 | 13,127 | 12,759 | 0.57% | 773 | 16.98 | City |
| Bacliff | 8 | 10,736 | 11,513 | 1.33% | 4,223 | 2.54 | CDP |
| Hitchcock | 9 | 7,973 | 7,315 | 1.68% | 132 | 60.43 | City |
| San Leon | 10 | 5,894 | 5,439 | 1.06% | 1,241 | 4.75 | CDP |
| Kemah | 11 | 3,062 | 1,811 | 8.89% | 1,670 | 1.83 | City |
| Bolivar Peninsula | 12 | 2,678 | 2,611 | 0.64% | 63 | 42.48 | CDP |
| Bayou Vista | 13 | 1,767 | 1,762 | 0.06% | 5,574 | 0.32 | City |
| Clear Lake Shores | 14 | 1,303 | 1,285 | 0.31% | 2,995 | 0.43 | City |
| Tiki Island | 15 | 1,109 | 1,109 | 0% | 2,330 | 0.48 | Village |
| Jamaica Beach | 16 | 1,074 | 1,079 | -0.09% | 1,849 | 0.58 | City |
League City is the largest city in Galveston County, with a population of 117,428.
Jamaica Beach is the smallest city in Galveston County.
There are 16 cities in Galveston County, Texas.