Home 美国房产, 投资物业 Top 500 Most Expensive Zip codes-252/500 By siteeditor. Published on 15 2 月, 2015. Top 500 Most Expensive Zip codes 2807 BLOCK ISLAND RI INCOME: Median Salary $53853 POPULATION:population density in Block Island, RI. is 111.23 persons/sq. mile