Cornerstone Credit Union

Cornerstone Credit Union is a popular credit union that has been “Rock Solid” since its founding in 1939 as MICRO SWITCH Employees’ Credit Union. At present, the union serves more than 13,600 members and 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.