Sigma Kappa if they attend as an undergraduate a university with an active chapter from which they receive a membership offer. Prospective members must meet the fraternity's national minimum GPA requirement (2.5/4.0) as well as the chapter's requirement. Alternatively, women past college-age may be invited or may apply to join via alumnae initiation if they are not already a member of another NPC sorority, a process which 20 of the 26 NPC members also participate in. Due to NPC agreements, no woman who has been initiated into another NPC sorority may join another one, although no NPC member is restricted from joining a professional or service Greek letter organization. Notable Sigma Kappas According to the sorority, it has initiated more than 185,000 women. Chapters Sigma Kappa has 119 collegiate chapters and 110 alumnae chapters. The Delta chapter of Boston University is now the oldest existing chapter. The Eta Chapter of Illinois Wesleyan University is the longest continuously running chapter. In 1984, Colby College banned fraternities and sororities, ensuring that the Alpha chapter will probably never be resurrected. In 2005, Sigma Kappa's Mu Chapter House at the University of Washington obtained City of Seattle Landmark status, becoming the only sorority or fraternity in Seattle to achieve Historic Landmark status both at the City of Seattle and on the National Historic Register. See also Sigma Delta, former, now unaffiliated Sigma Kappa chapter at Dartmouth College. References External links Sigma Kappa Sorority website Alzheimer's Association Maine Sea Coast Mission Guide to Sigma kappa Records at the University of Denver Retrieved 2014-09-26. 1874 establishments in Maine National Panhellenic Conference Student societies in the United States Fraternities and sororities based in Indianapolis Student organizations established in 1874