I grew up between Philadelphia and Wilmington, DE. This proves people have referred to pop as Coke.
http://strangemaps.wordpress.com/2008/08/1...op-vs-soda-map/
# coke: this generic term for soft drinks predominates throughout the South, New Mexico, central Indiana and in a few other single counties in Nevada, Utah and Wyoming. ‘Coke’ obviously derives from Coca-Cola, the brand-name of the soft drink originally manufactured in Atlanta (which explains its use as a generic term for all soft drinks in the South).