Alliant Credit Union is a not-for-profit financial cooperative, that means all of their customers are also stakeholders. The members-first concept has worked successfully for them. Alliant Credit Union is the largest credit union in Illinois and one of the largest in the country, with over 85 years of existence and more than $14 billion in assets. Residents of California, Colorado, Illinois, Texas, and Virginia can choose from 12 sites. With exceptional online, mobile, and phone banking services, together with an over comprehensive range of competitive products, simplify banking for our 600,000 members across the country.