Walnut is a suburban city in eastern Los Angeles County, California, United States. Its 2012 population was estimated at 29,661 by the United States Census Bureau. The 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 a general law city incorporated on January 19, 1959. It is governed by the city council/city manager form of government. A five-member city council is elected by the residents, and a mayor is elected annually by the council to serve a twelve-month term. A city manager is appointed by the council to oversee the daily activities of the city. The city covers nearly nine square miles (23 km2) and is home to hundreds of businesses.
Money's Best Places to Live, "America's best small towns," ranked Walnut as #70 in 2009 and #57 in 2011, the highest ranking for a Californian city both years.