7 in total plus for PSN there is a remake of COD 1 called COD classic
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there are eight call of duty games
One Call of Duty Roads to Victory
There are currently nine games in the main Call of Duty Series. there is also an upcoming tenth game, tentatively entitled Call of Duty 2013 scheduled for release in the fourth quarter of 2013. In addition, there are also expansions for many of the main games (18). Other proposed games include Call of Duty Online, Call of Duty Mobile, and the proposed Next Gen Call of Duty, which has an unstated future release date.
No, but many of the call of duty games made by treyarch are based on real events and real people.
there is seven call of duty series