Rock Island is a city located in Oklahoma. With a 2020 population of 644, it is the 284th largest city in Oklahoma and the 12243rd largest city in the United States. Rock Island is currently declining at a rate of -0.16% annually and its population has decreased by -0.31% since the most recent census, which recorded a population of 646 in 2010. Rock Island reached it's highest population of 658 in 2010. Spanning over 12 miles, Rock Island has a population density of 53 people per square mile.
The average household income in Rock Island is $58,235 with a poverty rate of 21.11%. The median rental costs in recent years comes to $650 per month, and the median house value is $93,300. The median age in Rock Island is 43.6 years, 44.3 years for males, and 41.9 years for females. For every 100 females there are 99.0 males.