You must live in Texas for six months and reside in a county for ninety days to file for a divorce in that county. The ninety-day residency requires actual, physical, continuous living in the county of suit by one of the parties to the suit with an intention to make that county home. The law requires also that you be a “domiciliary” of the state for six months. Tex. Fam. Code 6.301. There are other factors that may need to be considered.