By phone
Fond du Lac: (920) 922-9292
Brownsville: (920) 583-3166
Mayville: (920) 387-8787
Omro: (920) 685-6401
Princeton: (920) 295-3033
Telephone Banking (Info-Line): 1-800-711-9292
Online form
http://www.ambank.com/contact.php
Email (registered users only)