According to membership data submitted by the (inter-)national offices of each fraternity to the NIC in 1997, the top ten fraternities by initiated membership are:
1. Sigma Alpha Epsilon 246632
2. Sigma Chi 232403
3. Lambda Chi Alpha 225000
4. Sigma Phi Epsilon 214970
5. Tau Kappa Epsilon 208600
6. Phi Delta Theta 201000
7. Kappa Sigma 200000
8. Sigma Nu 195963
9. Pi Kappa Alpha 180000
10. Alpha Tau Omega 170500
Granted this data is four years old now, but other than the possibility of a slight change in relative ranking, these are probably still the top 10 fraternities nationally.
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