Mercer County, OhioProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Tax bill mailing
- 2026 schedule: first-half bills mailed January 16, 2026; second-half bills mailed by June 26, 2026.
- Payment deadline
- 2025 real-estate taxes payable in 2026: first half due February 20, 2026; second half due July 27, 2026.
- Assessment appeal
- January 1–March 31, 2027 for 2026 valuation complaints; Mercer County states complaints for tax year 2026 may be submitted during that period. For the 2025 tax year payable in 2026, the prior window was January 1–March 31, 2026.
Exemptions & appeals
View exemption application (opens in a new tab)Exemption filing
December 31, 2026 for a 2026 real-property homestead application; file with the county Auditor under Ohio's DTE 105A schedule.
Senior relief
Mercer County states the Ohio homestead exemption is available to homeowners age 65+ and permanently and totally disabled homeowners, subject to the income means test. For tax year 2025 collected in 2026, qualifying applicants generally may shield up to $29,000 of market value; the county also provides the DTE 105A application and disabled-veteran forms.
Valuation limits
No general county parcel-value cap was published. Ohio assesses real property at 35% of market value, reappraises every six years with triennial updates, and applies HB 920 reduction factors and the 10-mill limitation. House Bill 186, effective March 20, 2026, creates an automatic Inflation Cap Credit for qualifying school-district/JVS levy growth; it is a tax credit/collection limitation, not a general cap on appraised or taxable parcel value.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →