The County Assemblies were founded in 1938 by Mrs. Willem C. Schilthius of Westport to promote inter-town friendships, instill social graces, and provide financial support to organizations benefiting adolescents.

Each year, funds are raised by the dances and donated to charities in Fairfield County. Student Ambassadors from each school contribute to the charity of their choice and the Board of Directors distributes the remaining proceeds to charities that apply for grants.