The 10 Most Expensive Cities to Live in the U.S.

4. Hillsborough, California

Hillsborough is a small, super high-end town in Silicon Valley, filled with mega-mansions owned by wealthy tech executives who have greatly influenced our world. Besides being a place of luxury, it holds many historical landmarks, making it a fantastic spot for visitors exploring San Francisco. Residents of Hillsborough pay an average of $410,112 each year to cover their living costs, adding up to $34,176 per month (according to Go Banking Rates). The average home value in Hillsborough is almost $4.6 million, making a reasonable down payment of around a million dollars (as per Zillow).