npc sororities listed by date founded...

Alpha Delta Phi Wesleyan Female College May 15, 1851
Phi Mu Wesleyan Female College April 5, 1852
Pi Beta Phi Monmouth College April 28, 1867
Kappa Alpha Theta DePauw University January 27, 1870
Kappa Kappa Gamma Monmouth College October 13, 1870
Alpha Phi Syracuse University October 10, 1872
Delta Gamma Lewis School December , 1873
Sigma Kappa Colby College November 9, 1874
Gamma Phi Beta Syracuse University November 11, 1874
Alpha Chi Omega DePauw University October 15, 1885
Delta Delta Delta Boston University November 27, 1888
Alpha Xi Delta Lombard University April 17, 1893
Chi Omega University of Arkansas April 5, 1895
Alpha Omicron Pi Barnard College January 2, 1897
Kappa Delta Longwood College October 23, 1897
Sigma Sigma Sigma Longwood College April 20, 1898
Zeta Tau Alpha Longwood College October 15, 1898
Alpha Sigma Tau Michigan State Normal College November 4, 1899
Alpha Sigma Alpha Longwood College November 15, 1901
Delta Zeta Miami University October 24, 1902
Alpha Gamma Delta Syracuse University May 30, 1904
Alpha Epsilon Phi Barnard College October 24, 1909
Theta Phi Alpha University of Michigan August 30, 1912
Phi Sigma Sigma Hunter College November 26, 1913
Delta Phi Epsilon New York University March 17, 1917
Sigma Delta Tau Cornell University March 25, 1917