UNION COUNTY
County seat: Marysville
The courthouse is at 215 West 5th St. in Marysville. It houses the Union 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 Union 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.