Complete DTE Form 105A, Homestead Exemption Application for Senior Citizens, Disabled Persons, and. Surviving Spouses, and file it with your County Auditor.For more information, or to apply for the Homestead Exemption contact the Washington County Auditor's Office at (740) 373-6623 Ext 2123. Attention: Before filling out form, download and save to your computer. Disabled applicants must complete form DTE 105E,. Property tax exemptions and deferrals. Note: These programs are only available to individuals whose primary residence is located in the State of Washington. Please navigate to MyTax. DC.gov to begin the application process. You may be eligible if you have limited income and you're at least 61 years old in the year you apply for the exemption.