In 1931, Alpha Phi Alpha and Phi Beta Sigma Fraternities joined the Council. Sigma Gamma Rho Sorority joined in 1937 and Iota Phi Theta Fraternity completed the list of member organizations in 1997. Early in 1937, the organization was incorporated under the laws of the State of Illinois and became known as "The National Pan-Hellenic Council, Incorporated."

The nine affiliate organizations have pledged to devote their collective resources and services in an effort to enhance communities throughout the nation and world. Despite the diversity inherent in the individual groups, the NPHC provides the forum and umpetus for addressing issues of mutual concern. The organizations soon discovered that both nationally and locally the effect of their educational, social, and economic programs was greatly improved by uniting and coordinating efforts through the NPHC and the local councils.

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