Belmont County Probate Court Judge J. Mark Costine 101 W. Main Street St. Clairsville, Ohio 43950-1154 Phone (740)699-2144 Fax (740)699-2143 www.belmontcountyohio.org/index.html Return to Main Ohio County Page Belmont County Population 70,226 Return to Home Page Return to State of Ohio Map