Still growing strong after 56 years. Grantsville Federal Credit Union is a strong financial institution with federal status started in 1959 by Joe and Fern Wilson. It has come a long way since they started the credit union for Grantsville Residents. Grantsville Federal Credit Union is still your community financial partner. The community has grown since 1959 and is quite a bit larger in 2015. Grantsville Federal Credit Union membership eligibility includes all of Tooele County. We are proud to be part of the growth of our town and county, we look forward to the next 50 years.