Arlington Country Day School was a member of the Southern Association of Colleges and Schools (SACS), Accreditation International (AI) and the National Council for Private School Accreditation (NCPSA). ACDS also joined the Sunshine Independent Athletic Association (SIAA) in 2010 to allow for more flexibility than the FHSAA could offer. Arlington Country Day School’s enrollment had grown steadily over the years, and in 2010, the school expanded its student body by adding an international boarding component that draws students from around the world.