Neb. Rev. Stat. § 17-102: Neb. Rev. Stat. § 17-102

Unless the city elects council members at large as provided in section 32-554 , each city of the second class shall be divided into not less than two nor more than six wards, as provided by ordinance of the city council. Each ward shall contain, as nearly as practicable, an equal portion of the population.