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() is a city located in Multnomah County, Oregon, United States immediately east of Portland. It was named for the American Civil War general, and Postmaster General, Walter Quinton Gresham. The population was 90,205 at the 2000 census; in 2008, the Population Research Center estimated the city's population at 100,655. This makes Gresham the fourth largest city in Oregon.
The city of Gresham could not establish itself as a city unless given a post office and postal code. A local storeowner offered to use his store as a post office and offered to name the city after Postmaster General Walter Quinton Gresham if a post office was granted. Until that time, the city had simply been known as Campground because this forested site was where pioneers often stopped to spend the night and compose themselves before moving on to Portland. Although a post office was established in May, 1884, Gresham was not incorporated as a city until 1905. Lewis Shattuck, son of a pioneer family, was the first mayor.