I do not know the answer to that question, but it is possible that data for the more detailed sections (county, etc) might only be complete for GA. We are in CA, and I can see that the CA county info isn’t complete, probably because CA students lack county info in the data set.
For OOS, I would just go off the state-level data, and also keep in mind it’s an average over all the years 2019-2024. It’s not perfect, but it can give you an idea of how GT has a much higher bar for OOS admissions.