Omaha, Nebraska is 83% larger than Cedar Rapids, Iowa.
Area: 187 km2 calculated
Cedar Rapids is the second largest city in Iowa and is the county seat of Linn County. The city lies on both banks of the Cedar River, 20 miles north of Iowa City and 100 miles east of Des Moines, the state's capital and largest city. Wikipedia
Area: 342 km2 calculated
Omaha is the largest city in the state of Nebraska, United States, and is the county seat of Douglas County. It is located in the Midwestern United States on the Missouri River, about 10 miles north of the mouth of the Platte River. Wikipedia