
Rock Island
- County:
- Colorado County
- County Seat:
- No
- Area (mi²):
- 5.016
- State:
- Texas
Rock Island is a CDP located in Colorado County, Texas. Rock Island has a 2025 population of 492. Rock Island is currently growing at a rate of 6.96% annually and its population has increased by 10.07% since the most recent census, which recorded a population of 447 in 2020.
The average household income in Rock Island is $35,511 with a poverty rate of 22.64%. The median age in Rock Island is 39.8 years: 42.5 years for males, and 36.4 years for females.