Real Estate in Rock Island, TXRock Island is located in Texas. Rock Island, Texas has a population of 293. Rock Island is less family-centric than the surrounding county with 25% households with children. The county percentage for households with children is 27%. The median household income in Rock Island, Texas is $53,720. The median household income for the surrounding county is $48,434 compared to the national median of $57,525. The median age of people living in Rock Island is 45.4 years. Rock Island EnvironmentThe average high temperature in July is 96.3 degrees, with an average low temperature in January of 36.8 degrees. The annual precipitation is 44.75. Rock Island MapRock Island Real Estate officesReal Estate near Rock IslandNearby Cities |