Home Uncategorized Top 10 Most Expensive Zip Codes in California By siteeditor. Published on 28 12 月, 2013. 1. 94027 ATHERTON CA 2. 94022 LOS ALTOS HILLS CA 3. 94920 BELVEDERE CA 4. 94028 PORTOLA VALLEY CA 5. 90210 BEVERLY HILLS CA 6. 94010 HILLSBOROUGH CA 7. 90274 ROLLING HILLS CA 8. 93108 MONTECITO CA 9. 95030 MONTE SERENO CA 10. 94062 WOODSIDE CA