Greenbank is an unincorporated community on Whidbey Island in Island County, Washington, United States.Greenbank, which was named by Calvin Philips after his homestead in Delaware, has a population around 250. It is the location of the Greenbank Farm, once the largest loganberry farm in the world, and the Greenbank store, which was once owned and run by the Coupe family, descendants of Captain Thomas Coupe, founder of Coupeville and is now run by new owners unrelated to the Coupe family. Opening in 1904, the Greenbank store features a deli, access to the post office, a small grocery store, as well as a full service restaurant upstairs. Greenbank Farm with its historic 1904 barn is the location of Whidbey Pies, a Wine Tasting & Shop, Greenbank Cheese, Rob Schouten Gallery, Artworks Gallery, and Raven Rocks Gallery & Gifts. Whidbey Camano Land Trust has its headquarters in Barn C.