MERCER COUNTY
County seat: Celina
The courthouse is at 101 North Main St. in Celina. It houses the Mercer County Court of Common Pleas and its probate and juvenile divisions.
Court of common pleas
Municipal courts
Free civil legal help
Which legal aid program covers an address in Mercer County is answered by Alliance of Ohio Legal Aids, in the directory with the other statewide offices.
Read off Supreme Court of Ohio, Find Ohio Trial Courts & Local Rules and Supreme Court of Ohio, Ohio Courthouses on 13 October 2026. A list, not a referral: which court hears a case is set by statute and by each court’s own rules.