<human>: Which are the most expensive cities in the United States?
<bot>: The most expensive cities in the United States vary widely depending on factors such as cost of living, median income, and local tax rates. Generally speaking, New York City is one of the most expensive cities in the country with an estimated cost of living index of 120.8, while Honolulu, Hawaii has a cost of living index of 98.6. Other expensive cities include San Francisco (95.4), Los Angeles (94.5), Washington D.C. (93.3), Miami (92.7), Boston (90.9), Seattle (89.0), and Chicago (88.1).