I would probably stick in it the South since they were part of VA and VA is the South (even though NOVA is no longer politically part of the South) and they are now voting like the Republican South.
But if they say “pop” they’re Midwest enough for me!
Weird choice for “other” in certain parts of the country, some variation of “so-dee” or “so-dee pop”. That sounds like something out of the 19th century.
What do they call it in Puerto Rico?
In Puerto Rico, the generic is either “Coca-Cola” or “refresco” (the latter literally “refresher”). You can click on state results on that website to see the PR results.
The “other” category nationwide is mainly “tonic” in and around the Boston area, “soft drink” in NC and a few other places, the “soda-pop,” “sodie,” etc. that you noted (small minorities in some places), people d1cking around instead of answering seriously, and “vanity posts” by people who feel that they need a paragraph to describe what the call a group of carbonated beverages.