1. A library district may be established composed of one or more counties, one or more cities, or any combination of cities and counties.

Terms Used In Iowa Code 336.2

 2. a. Eligible electors residing within the proposed district in a number not less than five percent of those voting for president of the United States or governor, as the case may be, within the district at the last general election may petition the board of supervisors of the county, or the city council, for the establishment of the library district. The petition shall clearly designate the area to be included in the district, the total number of board members, and how representation on the board shall be divided among the jurisdictions.

 b. The board of supervisors of each county and the city council of each city containing area within the proposed district shall submit the question to the registered voters within their respective counties and cities at the next general election. The petition shall be filed not less than eighty-two days before the election.
 3. a. A library district shall be established if a majority of the electors voting on the question and residing in the proposed library district favor its establishment.

 b. The result of the election within cities maintaining a free public library shall be considered separately, and no city shall be included within the library district unless a majority of its electors voting on the question favor its inclusion. In such cases the boundaries of an established district may vary from those of the proposed district.
 4. After the establishment of a library district, other areas may be included subject to the approval of the board of trustees of the library district and the passage of a referendum by the electors of the area sought to be included.