Iowa Code § 303.46
In its order for the election the board of supervisors shall direct the county auditor to cause notice of the election to be given by posting at least five copies of the notice in public places in the proposed district at least twenty days before the date of election and by publication of the notice once each week for three consecutive weeks in some newspaper of general circulation published in the proposed district, or, if no such newspaper is published within the proposed district, then in such a newspaper published in the county in which the major part of the proposed district is located. The last publication is to be at least twenty days prior to the date of election. The notice shall state the time and place of holding the election and the hours when the polls will be open and closed, the purpose of the election, with the name of the proposed district and a description of its boundaries, and shall set forth briefly the limits of each voting precinct and the location of the polling places. Proof of posting and publication shall be made in the manner provided in section 303.44 and filed with the county auditor.
Iowa Code § 303.46
83 Acts, ch 108, §6
Referred to in §303.48, 303.64