Find Medicare Plans in Virgin Islands Click your county or zipcode below to view Medicare Plans in Virgin Islands Saint Croix County, Virgin Islands Zipcodes in Saint Croix County, Virgin Islands 00820, 00821, 00822, 00823, 00824, 00840, 00841, 00850, 00851 Saint John County, Virgin Islands Zipcodes in Saint John County, Virgin Islands 00830, 00831 Saint Thomas County, Virgin Islands Zipcodes in Saint Thomas County, Virgin Islands 00801, 00802, 00803, 00804, 00805