Bellevue is a city in eastern Jackson County, Iowa, United States. The city lies along the Mississippi River and next to Bellevue State Park. In 2020 its population was 2,363; up from a count of 2,191 at the 2010 Census, making it the second-largest and only growing city in Jackson County. The city lies in a valley created by two large bluffs, with the Mississippi River serving as the city's eastern border, and with the Mill Creek valley extending to the west.