In the Upper Midwest, “pop” is common, but other areas of the country have their own terms, such as “soft drink,” “soda,” or “coke.”
When I moved to Houston, TX from Detroit, MI, I used the term pop in reference to what is called soda here in Texas. Everyone looked at me, like what do you mean? Confused? I used non-verbal communication, pointing at the "soda" and they new then what I meant. I was even asked why I referred to this soft drink as "pop". I explained up North we use that term more so than the term soda.