San Bernardino, California is 2.6 times larger than Gresham, Oregon.
Area: 61 km2 calculated
Gresham is a city located in Multnomah County, Oregon, United States immediately east of Portland. It was named after the American Civil War general, and Postmaster General, Walter Quinton Gresham. The population was 105,594 at the 2010 census, making Gresham the fourth largest city in Oregon. Wikipedia
Area: 159 km2 calculated
San Bernardino is a city located in the Riverside-San Bernardino metropolitan area. It serves as the county seat of San Bernardino County, California, United States. Wikipedia