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

3. Los Altos Hills, California

In the realm of wealth, there's Los Altos, and then there's Los Altos Hills, and the "Hills" at the end hints that this town is even fancier than Los Altos (as per Wikipedia). Los Altos Hills boasts vast properties with mega-mansions and all the extravagant possessions that billionaires fancy. Those residing in Los Altos Hills spend an average of $421,017 annually on their living costs, which breaks down to a hefty $35,085 each month (according to Go Banking Rates). The typical home value in Los Altos Hills, as of January 2021, reached nearly $4.7 million.