In the year after its founding, Delta Delta Delta began its expansion period by adding a chapter in Iowa. By the first anniversary there were three chapters located in three different states. By 1900, the Fraternity had grown from Alpha Chapter at Boston University into 18 collegiate chapters and six alumnae chapters. That same year, the installation of a chapter at the University of California took Tri Delta to the west coast. The Fraternity became international in 1930 with the installation of a chapter in Canada at the University of Toronto.
Extension continues to be an important part of Delta Delta Delta.
Schools, colleges and universities welcome extension on their campuses for a variety of reasons, and each year an impressive number of campuses seek us out in their desire to acquire a national fraternity affiliation. These requests come from local sororities, from college administrations and from loyal alumnae. The Extension Committee consists of seven or more members, including the Executive Board with the Membership Director as chairman, the NPC Delegate and one other member appointed by the Executive Board. A unanimous vote of the Executive Board is required to establish a new chapter.