Cornerstone Credit Union

Founded in 1939 as MICRO SWITCH Employees’ Credit Union, Cornerstone Credit Union has been “Rock Solid” since its inception and serves more than 13,600 members. The union is open for membership to anyone who lives or works in the following northwest Illinois and southern Wisconsin counties. Illinois: Boone, Bureau, Carroll, JoDaviess, Ogle, Lee, Stephenson, Whiteside, and Winnebago Counties. Wisconsin: Green and Rock Counties. Family members of current CCU members also can join.