This year's cost of living index indicates that Seattle is in the top 10 most expensive cities to live in, in the US. For example, Seattle is rated as the number one most expensive city for a basic haircut. Beer is more expensive in Seattle; a 6 pack of 12-ounce bottles of Heineken in Seattle will cost you on average, $13.16. On average a 1/2 gallon of whole milk In Seattle is $5.25Based on this survey and research, if you take all 59 items and average them out Seattle ranks #10 on the list of most expensive cities in the United States. The most expensive city to live in in the United States is still New York City.