The valuation placed on your property is determined by the Union County Auditor as required by law (ORC 5713.01). Â The Auditor calculates tax rates based on public votes on tax levies and inside millage. Â The Treasurer's Office only collects taxes and does not determine property values.Â
| Valuation Information | County Auditor - 937-645-3003 | 
| Payment Information | County Treasurer - 937-645-3035 | 
| Missing/Lost Tax Bills | County Treasurer - 937-645-3035 | 
| Special Assessments | County Auditor - 937-645-3003 | 
| Homestead Exemption | County Auditor - 937-645-3003 |