Illinois again ranks No. 2 in U.S. for highest property taxes Illinois again ranks No. 2 in U.S. for highest property taxes Illinois again ranked second for highest property tax rates in the nation in 2021, behind only New Jersey. Illinois homeowners average $4,942 in property taxes on the U.S. median valued home of $217,500 – exactly double the national average. That’s a tax each year of 2.27% of the house value, according to the 2021 state... Illinois again ranked second for highest property tax rates in the nation in 2021, behind only New Jersey. Illinois homeowners average $4,942 in property taxes on the U.S. median valued home of $217,500 – exactly double the national average. That’s a tax each year of 2.27% of the house value, according to the 2021 state rankings by WalletHub.