What is the address for the delaware county courthouse? Delaware County Courthouse 117 North Union Street, Level 300 Delaware, Ohio 43015 Phone: (740) 833-2500How to contact the delaware county sheriffs office? Contact for questions about: employment verification, job opportunities with Delaware County for all employees except those employed by the Sheriff’s Office (see below for Sheriff’s Office HR contact). Location: 91 N. Sandusky St., 3rd Floor, Delaware, OH 43015. Main Phone Number: (740) 833-2120. Fax: (740) 833-2119. Website. Email Human ResourcesHow do i contact delaware county auditors office? If you have a question about your property’s tax assessment, you can send an email to the Auditor’s Office or call them at (740) 833-2909. If you have a question about the sales taxes that Delaware County collects, you can send an email to the Auditor’s Office or call them at (740) 833-2909.How do i contact the delaware county engineers office? If you have a question or comment involving a Delaware County-owned road or bridge, you can send an email to the Engineer’s Office or call them at (740) 833-2400. If you have a question about paying property taxes, you can send an email to the Treasurer’s Office or call them at (740) 833-2480.