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There is 99 Power Rangers in the series including the Mighty Morphin Power Rangers, Zeo, Turbo, In Space, Lost Galaxy, Lightspeed Rescue, Time Force, Wild Force, Ninja Storm, Dino Thunder, S.P.D,...
Currently, there is no specific information on how many more Power Rangers series they will release but they are currently in the 16th series, Power Rangers Samurai" which began airing February 7,...
This is not in chronological order but.
MMPR
Zeo
Turbo
Light Speed Resue
In Space
Lost Galaxy
Time Force
Ninja Storm
Wild Force
Dino Thunder
Mystic Force
Operation Overdrive
...