Iowa’s statewide average property tax rate is $33.24, above Washington County’s average rate. According to the Department of Management and LSA Calculations, Washington County’s average rate is $31.78 in fiscal year 2017. Washington County’s average urban rate is also below the state average, however the rural rate is higher. The statewide average rural property tax rate is $25.81 and Washington County falls in the $28.01-$38.22 range.