It is possible for him to file in a different county but generally the county where the plaintiff or the defendant resides is the one that has jurisdiction.
In the event of a conflict between two proper jurisdictions, the one which filed first generally will succeed. However, you must serve him before the time period runs out otherwise the case will be dismissed automatically and he’ll be able to file wherever he wishes.
Truthfully, it really doesn’t matter who files for the divorce first. Each party has an opportunity to file for divorce independent of the other parties claim.
Leonard M. Weiner, Esq. Divorce Solutions