Iowa Code § 349.11: Appeal.

Any applicant may, within twenty days after the selection of official newspapers, appeal to the district court from the decision of the board of supervisors as to the selection of any or all newspapers so selected by filing in the office of the county auditor a bond for costs, in a sum and with sureties to be approved by said auditor, and by serving upon each applicant, whose selection the appellant desires to contest, and the county auditor, a notice of appeal.