Rock Island is a city in Douglas County, Washington, United States. It is allowance of the Wenatchee–East Wenatchee Metropolitan Statistical Area. The population was 788 at the 2010 census.

Rock Island was officially incorporated upon November 3, 1930. The Place of Rock Island was used by Native American tribes for fishing and crossing of the Columbia River due to the genial Rock Island Rapids prior to agreement of the Washington Territory.

The site had been since settled in the late 19th century and was known as Hammond; early maps sometimes feat the city as Hammond P.O. (Post Office) or Power City. In the teacup valley in which Rock Island is currently located, two men, Ingraham and McBride, opened a trading pronounce in the yet to be 1860s. Their patrons were local Native Americans, who often fished that stretch of the Columbia considering the fish were running. The two pioneering men would far ahead move their read out to the mouth of the Wenatchee River, leaving Tiny trace of their stay.

The most notable figure in Rock Island’s founding is James E. Keane. As the first steadfast settler to the Rock Island area, James Keane arrived in imitation of a crew of men in 1887. Keane planned to build a house and tally the land that he had acquired through the Homestead, Pre-emption, and Desert Acts. Four years later, the Great Northern Railroad made its first survey of the Place and began construction toward the valley from the east. One half mile upriver from the Famous Rock Island Rapids, Mr. Keane platted a townsite he named Hammond.