Glenwood, Iowa – 5,073 inhabitants Gretna, Nebraska – 5,083 inhabitants Plattsmouth, Nebraska – 6,544 inhabitants Ralston, Nebraska – 6,494 inhabitants Cities of 1,000 to 5,000 people (2019 estimates) Cities and villages with fewer than 1,000 people (2019 estimates) Census-designated places (2020) Chalco, Nebraska – 11,064 inhabitants Offutt Air Force Base – 5,363 inhabitants Annexations of formerly incorporated places by the City of Omaha Notes External links Population for Iowa metropolitan areas and components, 1950 – 2000 omaha.towncommons.com – wiki website for the Omaha–Council Bluffs metro area Geography of Omaha, Nebraska Metropolitan areas of Nebraska Metropolitan areas of Iowa Regions of Iowa Regions of Nebraska