The first place to check would be Baird's Manual of American College Fraternities. This book contains a listing of current and defunked Sororites and Fraternities. The last edition was in 1991.

Several different sites such as Greekpages, GreekSpot, GreekZone contain a listings of assorted pages for greek organizations. These may be useful in checking for organiztations that have been established since 1991. Also consider doing a websearch.

Hope this helps.

Artimis

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Beta Chapter Alumnae and Founder
Alpha Sigma Kappa - Women in Technical Studies
http://alpha-sigma-kappa.ou.edu/