State and County Residency
Ohio's residency requirement is six months. You must live in the state this long before you can file for divorce, and the six months must be those that lead up to your filing. You must live in the county where you file for a minimum of 90 days. One exception exists: If your spouse has met residency requirements in the state, you can file in Ohio even if you live elsewhere.
Even if you meet Ohio's residency requirements, the court may not be able to do much more than grant you a divorce. If your spouse never lived in the state with you, this can limit jurisdiction over him, and the court may not be able to rule on things like asset division or alimony. This is particularly true if the two of you own property in the state where your spouse is currently living, such as if you were married there and moved to Ohio when you broke up. Ohio may not be able to rule on custody unless your children have also resided in the state for six months.