Omaha, Nebraska is 2.6 times larger than Wilmington, North Carolina.
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
Area: 131 km2 calculated
Wilmington is a port city in- and is the county seat of- New Hanover County in coastal southeastern North Carolina, United States. The population is 106,476; according to the 2010 Census it is the eighth most populous city in the state. Wikipedia