As a comparison, here are stats from our fellow Greek Chat member Ariesrising's Greek Info Pages web site.
http://www3.telus.net/ariesrising/
Sororities with 100 plus chapters
176 Chi Omega
165 Delta Zeta
143 Alpha Phi
143 Delta Gamma
143 Zeta Tau Alpha
135 Delta Delta Delta
134 Pi Beta Phi
133 Alpha Chi Omega
133 Alpha Delta Pi
130 Kappa Kappa Gamma
124 Kappa Delta
124 Kappa Alpha Theta
123 Phi Mu
114 Alpha Gamma Delta
114 Gamma Phi Beta
113 Alpha Sigma Tau
112 Alpha Omicron Pi
112 Alpha Xi Delta
113 Phi Sigma Sigma
113 Sigma Kappa
107 Sigma Sigma Sigma
Sororities with 100,000 plus initiates
225,000 Chi Omega
220,000 Zeta Tau Alpha
210,000 Delta Delta Delta
205,000 Pi Beta Phi
191,000 Kappa Alpha Theta
190,000 Delta Gamma
186,000 Kappa Kappa Gamma
183,000 Alpha Delta Pi
177,501 Kappa Delta
162,929 Alpha Chi Omega
137,813 Delta Zeta
136,000 Alpha Gamma Delta
131,825 Phi Mu
129,439 Alpha Phi
125,000 Alpha Omicron Pi
120,000 Alpha Xi Delta
117,290 Sigma Kappa
103,688 Gamma Phi Beta
103,688 Sigma Sigma Sigma
Fraternities with 100 plus chapters
364 Lambda Chi Alpha
300 Tau Kappa Epsilon
258 Sigma Phi Epsilon
245 Kappa Sigma
228 Sigma Chi
210 Sigma Nu
208 Sigma Alpha Epsilon
192 Pi Kappa Alpha
175 Phi Delta Theta
157 Alpha Tau Omega
147 Theta Chi
129 Pi Kappa Phi
128 Phi Gamma Delta
126 Beta Theta Pi
126 Kappa Alpha Order
123 Sigma Pi
117 Delta Chi
110 Delta Sigma Phi
Fraternities with 100,000 plus initiates
262,000 Sigma Alpha Epsilon
240,000 Sigma Phi Epsilon
238,000 Sigma Chi
235,000 Lambda Chi Alpha
208,600 Tau Kappa Epsilon
201,000 Phi Delta Theta
200,000 Kappa Sigma
195,963 Sigma Nu
180,000 Pi Kappa Alpha
170,500 Alpha Tau Omega
167,500 Beta Theta Pi
140,997 Theta Chi
139,700 Phi Gamma Delta
118,097 Zeta Beta Tau
115,000 Kappa Alpha Order
110,000 Delta Upsilon
110,000 Phi Sigma Kappa
105,000 Delta Sigma Phi
102,000 Phi Kappa Psi