Iowa Code § 580.4
Liens may be enforced by the holder filing with the sheriff of the county in which the progeny is kept, an affidavit which shall, in addition to a demand for foreclosure, contain:
[S13, §2341-u; C24, 27, 31, §2970; C35, §10347-a4; C39, §10347.04; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §580.4]