2019 Property Tax Bills For Washington County Tennessee And Johnson City Residents Are In The Mail. County Taxpayers Have Until February 29Th To Pay While City Residents Have Until December 31St To Pay. Bills Due After These Dates Will Incur Additional Late Fees. County Residents Can Pay Online At Washingtoncountytn.Org, In Person At The Courthouse In Jonesborough Or In Person At The County Clerk Office In Johnson City. City Residents Can Pay Online At Johnsoncitytn.Org Or In Person At The Municipal And Safety Building On Main Street.