How to Join Cornerstone Credit Union - Easy as 1-2-3! 1- Visit any location OR use our online membership application at cornerstonecu.org 2- Deposit $25 into your new savings account. 3- Enjoy convenient benefits: free checking, mobile & online access, affordable loans, rewards credit card, shared branching and more! "Must meet member eligibiity requirements. Opento anyone living or working in following northwest linois and southern Wisconsin counties. Ilinois: Boone, Bureau, Carroll, oDeviess, Ogle, Lee, Stephenson, Whiteside, and Winnebago Counties. Wisconsirc Green and Rock Counties. Federally insured by NCUA. CORNERSTONE CREDIT UNION Freeport | Sterling | Milledgeville | South Beloit 800.711.3277 How to Join Cornerstone Credit Union - Easy as 1-2-3! 1- Visit any location OR use our online membership application at cornerstonecu.org 2- Deposit $25 into your new savings account. 3- Enjoy convenient benefits: free checking, mobile & online access, affordable loans, rewards credit card, shared branching and more! "Must meet member eligibiity requirements. Opento anyone living or working in following northwest linois and southern Wisconsin counties. Ilinois: Boone, Bureau, Carroll, oDeviess, Ogle, Lee, Stephenson, Whiteside, and Winnebago Counties. Wisconsirc Green and Rock Counties. Federally insured by NCUA. CORNERSTONE CREDIT UNION Freeport | Sterling | Milledgeville | South Beloit 800.711.3277