No. 5 Richest Zip Code: 94028, Portola Valley, Calif.

No. households: 2,579
Pct. change in no. households since 2000: 3.28
Average household income: $270,922
Average household net worth: $1,531,291

This Portola Valley Zip code is adjacent to the No. 9 richest Zip Code, 94022, and the No. 32 richest, 94304. The town of Portola Valley is just west of Stanford University in a valley by the San Andreas Fault. It offers a trail system, scenic roads, open space, and natural views, according to the town. Elite couples and singles are the predominant inhabitants.

Photographer: Dave Anderson/Getty Images
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