Iowa Code § 39.27: Qualifications for public office.

Any person elected to an office under the laws of this state shall be an eligible elector. At the time an elected official takes office the official shall be a resident of the state, district, county, township, city, or ward by or for which the person was elected, or in which the duties of the office are to be exercised. An elected official shall continue to be a resident of the state, district, county, township, city, or ward by or for which the person was elected, or in which the duties of the office are to be exercised for the duration of the term of office. This section shall not apply to United States senators or representatives in Congress or to members of the general assembly.