Los Altos ranks as the fourth wealthiest U.S. suburb with an average household income of $403,512 and a home value of $4.56 million. California dominates the list, featuring 17 suburbs among the top 50 wealthiest, including Alamo, Orinda, and Palos Verdes Estates. The wealthiest suburb overall is Scarsdale, New York, with a 2023 average household income of $601,193.