Biohazard Cleanup Near North Walnut Walnut, CA

Walnut's name comes from Rancho Los Nogales — Spanish for "Ranch of the Walnut Trees" — the Mexican land grant that once covered its land, later consolidated into Rancho San Jose.

Walnut residents voted to incorporate on January 19, 1959, largely out of fear of annexation by their neighbors West Covina and the City of Industry.

At incorporation Walnut was still nearly empty — the 1960 census counted just 934 people — before its population soared to about 30,000 by the early 1990s.

According to the 2020 census, Walnut had a population of 28,430.

Walnut has about 8,700 households averaging about 3.2 people each, and roughly 84% of its homes are owner-occupied.

Walnut is among the highest-income cities in the country, with a median household income of about $133,800 in recent Census Bureau estimates and a median owner-occupied home value over $1 million.

Walnut is home to Mt. San Antonio College (Mt. SAC), one of the California Community Colleges, located near the city's border with Pomona.

The Mt. SAC Relays, an annual track and field festival held at Hilmer Lodge Stadium on the college campus, have been run since 1959.

Walnut is served by the Walnut Valley Unified School District, ranked by numerous sources as one of the top public school districts in Southern California.

Walnut is known as one of the cities with the lowest crime rates in the San Gabriel Valley.