Welcome to the official Mercer County Auditor Website
Mercer County boasts a serene, countryside setting and the largest inland lake, Grand Lake St. Marys, in Ohio. Our rural county is set along Ohio's western border and is centrally located between the region's major cities: Columbus, Toledo, Cincinnati, and Indianapolis.
Established in 1820, the region’s roots are rich in agriculture. Our diversified economy provides employment opportunities in key industries such as agricultural/food, health, education, manufacturing, and transportation logistics. Mercer County regularly boasts the lowest unemployment rate in Ohio. Our sense of community is built upon strong work ethics and strong commitment to our family, quality education, and faith.
We welcome you to visit Mercer County – discover our small-town charm, recreation trails, museums, festivals, and more. Discover why approximately 42,500 residents proudly call Mercer County home and why some refer to that home as “God’s Country”.
Randy Grapner
Mercer County Auditor
101 North Main Street Room 105
Celina, OH 45822
Phone
(419) 586-6402
Fax
(419) 586-4751 Budgetary Dept.
(419) 586-9425 Real Estate & Tax Map
Monday: 8:30 a.m. - 5:00 p.m.
Tuesday: 8:30 a.m. - 4:00 p.m.
Wednesday: 8:30 a.m. - 4:00 p.m.
Thursday: 8:30 a.m. - 4:00 p.m.
Friday: 8:30 a.m. - 4:00 p.m.
Mercer County first half real estate tax payments were due to the County Treasurer by February 20, 2024.
Second half real estate tax payments were due July 22, 2024.
- If you have questions regarding your billing, please call the Treasurer's Office at (419) 586-2259.
- If you have questions regarding your property assessment, please call the Auditor's Office at (419) 586-6402.