The wikipedia article on the Green Lantern Corps says 7200
http://en.wikipedia.org/wiki/Green_Lantern_Corpsand here's a list:
http://en.wikipedia.org/wiki/Rot_Lop_Fan " In blackest day or brightest night
Watermelon, cantaloupe, yadda-e-yadda
Erm...superstitious and cowardly lot
With liberty and justice for all! "
Duck Dodgers - The Green Loontern