According to the Fraternity Executive Association, the top 10 according to the size based on # of active chapters is:
Tau Kappa Epsilon
Sigma Phi Epsilon
Sigma Chi
Lamda Chi Alpha
Sigma Alpha Epsilon
Kappa Sigma
Sigma Nu
Pi Kappa Alpha
Phi Delta Theta
Alpha Tau Omega
I used the stats from this organization because it probably has the least bias in stating the facts.
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