We started humbly in 1959 with eight members and $40 on deposit to serve employees of the DuPont Nylon Capital Plant in Seaford, Delaware. Over the years, we’ve changed names, expanded our membership base and increased our assets exponentially as a result.

In 1959, there were over 13,000 credit unions serving the employees of most major employers. Over time, many of these employers closed and credit unions had to evolve. Some converted to community charters, some expanded to include numerous small employers, and some merged into larger credit unions.

In 1996, we converted to a community charter and changed our name to Sussex County FCU. At that time we were less than $100 million in assets. We had basic savings and lending products and no electronic services.

After we converted we started to branch out. First, we built a branch in Lewes, followed by Milford, Seaford, and Millsboro…….

In 2015, we expanded our charter to include Wicomico, Worcester, and Somerset Counties in Maryland.

In 2016, we changed our name to Tidemark FCU to better serve the other counties in our field of membership.

In 2019, we built two new branches featuring the latest and greatest technology in Long Neck and Selbyville.

In 2020, we expanded our charter to include Kent County, DE. 

In 2021, Dor-Wic FCU merged into Tidemark FCU, bringing our first physical branch in Maryland, our Salisbury, MD branch. (Closed branch in 2023)

In 2023, DelmarvaPower Southern Division FCU merged into Tidemark FCU, giving us a presence in North Salisbury inside the DelmarvaPower building. (Closed branch in 2024)

In 2024, we opened a branch in South Salisbury across from Salisbury University.

Today we are over $470 Million in Assets. 

Our membership base is 21,000+ members.