These are the most expensive neighborhoods in America. 10. ZIP code 90077 > Median list price: $2.82 million > City/town: Bel Air, Calif. > Year-over-year change: 16.4% 9. ZIP code 06831 > Median list price: $2.90 million > City/town: Greenwich, Conn. > Year-over-year change: 16.1% 8. ZIP code 93108 > Median list price: $3.19 million […]