In which county can I file for a protective order?
You can file a petition in the county where you live, the county where the abuser lives, or any county where the family violence took place.1 However, if you have a divorce case pending or a pending case affecting the parent-child relationship, you must file for the protective order in the court in which that case is pending or in the court in the county in which you reside (and you must notify the clerk of the pending case).2
1 Tex. Fam. Code § 82.003
2 Tex. Fam. Code § 85.062(a),(b)