Gardena is a city located in the South Bay (southwestern) region of Los Angeles County, California, United States. The population was 58,829 at the 2010 census, up from 57,746 at the 2000 census. Until 2014, the US census cited the City of Gardena as the place with the highest percentage of Japanese Americans in California. Gardena has a large Japanese population, helping make the South Bay region of Los Angeles home to the largest concentration of Japanese companies within the mainland United States.
Based on archaeological findings, the Tongva people hunted and fished in the area of today's Gardena. The Tongva Indians — also known as Gabrielino Indians — are probably descendants of those who crossed from Asia to North America around 10,000 years ago.
In 1784, three years after the foundation of Los Angeles, Juan Jose Dominguez (1736–1809), a Spanish soldier who arrived in San Diego, California in 1769 with Fernando Rivera y Moncada, in recognition of his military service, received the roughly 43,000-acre (170 km2) Spanish land grant, the Rancho San Pedro. Part of this land contained what became known as Gardena Valley. After the American Civil War veterans bought parts of the land, and soon ranchers and farmers followed suit. Union Army Major General William Starke Rosecrans in 1869 bought 16,000 acres (65 km2). The "Rosecrans Rancho" was bordered by what later was Florence Avenue on the north, Redondo Beach Boulevard on the south, Central Avenue on the east, and Arlington Avenue on the west. The Rosecrans property was subdivided and sold in the early 1870s.