Quality housing consists of master-planned single family homes ranging in size from 1,800 to 11,200 sq ft (170 to 1,040 m2).

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.

[11] The 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, native to the San Jose Hills.

Walnut is located on the southern slopes of the San Jose Hills, with West Covina to the northwest, Covina to the north, San Dimas to the northeast, Pomona to the east, Diamond Bar, Rowland Heights, and the City of Industry to the south, and La Puente to the west.

Spanish missionaries who arrived in the 18th century called the indigenes Gabrieleño, because the area where they lived was controlled by the San Gabriel Mission.

The Walnut area was part of the network of outlying ranches used for the grazing of cattle and sheep by the Mission.

The land was used mainly for raising cattle and growing wheat, grapes, and fruit trees (mostly citrus).

[14] As a reminder of those early days, the U.S. Post Office is on Lemon Avenue, one of the town's main streets.

The modest structure built in 1883 served as the home of Mr. Meridith, ranch foreman for William Rowland.

[33] According to the 2010 United States Census, Walnut had a median household income of $101,250, with 6.2% of the population living below the federal poverty line.

According to the 2010 United States Census, Walnut had a median household income of $101,250, with 6.2% of the population living below the federal poverty line.

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.

SAC Relays are an annual track and field festival held primarily at Hilmer Lodge Stadium on the Mt.

This meet and other elite track meets held at the stadium, including the 1968 Olympic Trials and two editions of the USA Outdoor Track and Field Championships have emblazoned the identification of "Walnut, California" in numerous national records in athletics around the world.

In April 2008, billionaire land developer and co-owner of the Los Angeles Lakers and Kings Edward P. Roski unveiled plans for the construction of an $800 million NFL stadium in the neighboring City of Industry.

[42] In March 2009, Walnut filed a lawsuit opposing construction of the stadium, but dropped those charges in September.

[43][44] On October 23, 2009, California governor Arnold Schwarzenegger signed a bill allowing the 75,000-seat stadium to be built in neighboring Industry in hopes of attracting an NFL team there.

[45] This bill would also nullify a lawsuit filed by local residents over the project's environmental impact report.

[49] Primary education in Walnut is generally served by the prestigious Walnut Valley Unified School District (WVUSD), which has been ranked by numerous sources to be one of the top public school districts in all of Southern California;[10] it also serves parts of the city of Diamond Bar.

The Los Angeles County Sheriff's Department (LASD) operates the Walnut/Diamond Bar Station in Walnut.