In the Detroit area...they call it 'Pop'.  In the NYC/NNJ area, it's 'Soda'....and in South Florida you get a mix of the two, but 'Soda' is the dominator.  I've always thought it was very interesting on how different parts of the US call a 'soft drink' by many different names.  I found this fun map (on another South Florida blog called MenuPages Blog) and it color codes the US to show the differences in the 'slang'.  I never realized that a large chunk of the south calls every soft drink "coke".  I'm thinking that the 'Other' means they just call it by the actual name....which isn't too interesting.

Pop - shades of blue.
Coke - shades of red.
Soda - shades of yellow to green
Other - shades of green to purple