Help for Mercer County Storm and Tornado Victims

If your home or buildings have been damaged or destroyed by the recent storms, Ohio law requires that you complete the DTE Form 26 and return it to the County Auditor's Office.  Once our office receives this form, a property appraiser will visit your property to gather information and take pictures.  After inspecting your property, we can make an adjustment to your property's appraised value based on the severity of the damage.  

Mail Forms to:
Mercer County Auditor's Office
101 N Main St. Rm. 105
Celina, Ohio 45822


Welcome to the NEW 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”.

Contact Us

Randy Grapner

Mercer County Auditor

101 North Main Street Room 105

Celina, OH 45822


(419) 586-6402


(419) 586-4751     Budgetary Dept.

(419) 586-9425    Real Estate & Tax Map


[email protected]ov

Staff Directory

Office Hours

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.

Real Estate Tax Bills

Mercer County first half real estate tax payments were due to the County Treasurer by February 20, 2024. 

Second half real estate tax billing will be mailed out around June 20, 2024, and will be 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.