Walnut is a suburban, upper middle class city in the eastern part of Los Angeles County in California. Money's Best Places to Live ranked Walnut #70 in 2009 and #57 in 2011, the highest ranking for a Californian city both years.The greater Walnut Valley is located between the steep San Jose Hills mountain range to the north, and the gentle Puente Hills to the south. Quality housing consists of master-planned single family homes ranging in size from 1,800 to 11,200 square feet.