1947
Sunmount Federal Credit Union was founded. Sunmount was a veterans hospital at the time, and the newly formed credit union served their employees.
1965
Sunmount Veterans Hospital closed. Within the same facility though, NYS created a program to serve patients with developmental disabilities.
1974
North Country Employees Federal Credit Union was formed in Potsdam, on the SUNY Potsdam campus. The credit union served the employees of SUNY Potsdam, SUNY Agricultural & Technical College in Canton, as well as Clarkson College of Technology in Potsdam.
1977
Clinton County Employees Federal Credit Union was established.
1983
Starting off the year fresh, that January Sunmount FCU changed names to Sunmount Employees Federal Credit Union.
That same year, yet another name change would come. North Country Employees FCU changed their name to North Country Educational Employees Federal Credit Union. Membership expanded by amendment to include the surrounding central schools, and St. Lawrence University.
1986
Sunmount Employees FCU constructed and moved to 280 Park Street, in Tupper Lake.
1989
Sunmount Employees FCU changed their name to Adirondack Regional Federal Credit Union, and that same year North Country Educational FCU merged with Adirondack Regional FCU.
1991
Adirondack Regional FCU moved from SUNY Potsdam to current location, at 186 Market Street.
2001
Adirondack Regional FCU merged with Clinton County Employees FCU.
2021
Adirondack Regional FCU moved into the newly purchased, and renovated Route 3 building in Plattsburgh.