Alan McConchie, cartographer who has collected over 400,000 responses in 20 years to the question, “Do you say Soda, Pop, or Coke?” on his website, popvssoda.com.
Fun fact: The bubbles in soda/pop/coke (cover our bases 🙂 are carbon dioxide which dissolves in the liquid, finds equilibrium, some of the carbon dioxide reacts with water to make carbonic acid which then mostly converts back to carbon dioxide during the pressure change from opening the can/bottle/pouch. The carbonic acid can make the drink taste a little sour.
This map of the United States displays color values for the colloquial use of soda, pop, or coke. “Soda” is blue (in New England, California, parts of Illinois, Missouri, and Wisconsin), “Coke” is pink (in southeast U.S. from New Mexico to Florida), and “Pop” is yellow (in the mid & northwest from part or Pennsylvania to Washington).