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. The city hosts a highly ranked public school system - the Walnut Valley Unified School District, which has been ranked by numerous sources as one of the top public school districts in Southern California. as well as Mt. San Antonio Community College. Walnut is one of the cities with the lowest crime rates in the San Gabriel Valley.

The city covers nearly nine square miles (23 km2) and is home to hundreds of businesses. Its 2012 population was estimated at 29,661 by the United States Census Bureau. According to the 2010 United States Census, Walnut has a median household income at one of the top earning percentiles in the country at $101,250, with 6.2% of the population living below the federal poverty line.

In 1895, the first U.S. post office was established and given the name "Lemon". In 1908, the post office name was changed to Walnut. As a reminder of those early days, the U.S. Post Office is on Lemon Avenue, one of the town's main streets.  

Walnut holds an annual "Walnut Family Festival." On the day of festival, several streets in the area (such as portions of Lemon and La Puente) are closed in the morning and a parade is held in which many local clubs and groups participate. Later in the afternoon, a fair with booths, games, food, and activities is held in Suzanne Park, adjacent to Suzanne Middle School. The Walnut Family Festival usually occThe city's name is derived from the Rancho Los Nogales Mexican land grant: nogales being the Spanish word for "walnut trees". The native California black walnut is a common tree of the San Jose Hills.

The city of Walnut is located close to the 60 freeway for easy access to surrounding cities and downtown Los Angeles.

The City also has many recreational areas and Royal Vista golf course and country club.

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