After the marriage has been solemnized, the officiating minister or magistrate shall attest to the marriage on the blank provided for that purpose and return the certificate of marriage within fifteen days to the county registrar who issued the marriage license.
Iowa Code § 595.13
95 Acts, ch 124, §19, 26; 2000 Acts, ch 1140, §44; 2002 Acts, ch 1119, §189
See also §144.36 for certificate