We treat our members like they own the place, because they do! Come own a part of something great! Advantage Credit Union is a full service financial institution with over 5,200 members in 19 Iowa counties.121 W 3rd St North Newton, IA 50208 1-800-824-2575 At Advantage Credit Union, we encourage our members to save so they can build economic security for themselves and their families. In addition, we provide consumer and home mortgage loans as well as many other money-saving and convenience-oriented advantages and benefits.