Washington County Tennessee Property Owners, Time Is Running Out On Getting Your 2023 Tax Bills Paid. Payments Must Be Completed Or Postmarked Before Midnight February 29th, Which Is Thursday. They Can Be Paid In Person At The County Courthouse Between The Hours Of 8 Am And 4:30 Pm. You Can Also Drop Your Check In One Of The Secure Collection Boxes At The Back Of The Historic Courthouse In Jonesborough Or Outside The Trustee’s Office In Johnson City. You Can Pay Online At Washingtoncountytn.Org