Fluoridation is often a local decision, and many water supplies naturally contain fluoride anyway (e.g. much of the western US groundwater contains more fluoride than the levels typically targeted when water is fluoridated).
Water supplies are local. You would have to know the city or town where the food was processed. For example, my town has flouridated water, but the town next to me does not. In the next town, everybody has wells. The town does not supply water. So, it varies by locale, not by state.
Thank you for your replies. I may just opt to avoid processed foods, in general, which should eliminate any fluoridation, no matter in which town or city the food is made. I will probably also grow my own fruits and veggies to eliminate toxins, as well.