I found this information on the University of Oregon Panhellenic website:
http://greeklife.uoregon.edu/resources/statistics
University of Oregon:
Campus Total=119
Alpha Chi Omega: 63
Alpha Phi: 63
Chi Omega: 62
Delta Delta Delta: 62
Delta Gamma: 62
Gamma Phi Beta: 57
Kappa Delta: 64
Kappa Kappa Gamma: 63
Pi Beta Phi: 63
University of Oregon Eugene, OR:
Gamma Phi Beta 1908
Kappa Alpha Theta 1909-1997/Colony 2011
Chi Omega 1909
Delta Delta Delta 1910-2000/2010
Delta Gamma 1913
Kappa Kappa Gamma 1913
Alpha Phi 1915
Pi Beta Phi 1915
Alpha Delta Pi 1920-1986
Delta Zeta 1920-1992
Alpha Chi Omega 1921
Alpha Xi Delta 1922-1968
Alpha Omicron Pi 1923-1989
Alpha Gamma Delta 1924-1969
Kappa Delta 1926-1933/1990
Phi Mu 1927-1937
Sigma Kappa 1928-?/1991-2004
Zeta Tau Alpha 1929-1943/1945-1971