 Well, two Westchester County, New York communities are the wealthiest suburbs in the country. That according to GoBankingRates, which finds that the richest suburb is Scarsdale, New York, where the average household income tops $568,000 and the value of a typical home is more than $1.4 million. Rye, New York comes in at number two with an average household income of around $405,000 and a typical home value of over $2 million.