Del-One Federal Credit Union (formerly Delaware Federal Credit Union) is a credit union headquartered in Dover, Delaware. Del-One Federal Credit Union was officially chartered in 1960. Del-One is the largest credit union in Delaware. As of March 2020, Del-One had over $520 million in assets, serving over 72,000 members with 11 branches.
In 1996, Del-One Federal Credit Union merged with American Mirrex Federal Credit Union.
In 1999, Del-One Federal Credit Union merged with Delaware Transit Employees Federal Credit Union.
In 2008, Del-One Federal Credit Union merged with Department of Labor Federal Credit Union.
In 2013, Del-One Federal Credit Union merged with Seaford Federal Credit Union.
In 2015, Del-One Federal Credit Union merged with U-DEL Federal Credit Union, and Newport Site Employees Federal Credit Union.
In 2017, Del-One Federal Credit Union merged with ICI America Federal Credit Union, established in 1973.