Rancho Los Coches was a 8,794-acre (35.59 km2) Mexican land grant in present day Monterey County, California given in 1841 by Governor Juan Alvarado to María Josefa Soberanes. The name means "the pigs". The grant was south of Soledad and extended along the Arroyo Seco.
The Soberanes family partiarch, José Maria Soberanes (1753-1803) accompanied the Portola expedition to San Francisco Bay in 1769. Soberanes married Maria Josefa Castro (1759-1822) and received Rancho Buena Vista. His sons Feliciano Soberanes (1788-1868) and Mariano Soberanes (1794-1859) were granted Rancho El Alisal in 1833. Feliciano Soberanes married Maria Antonia Rodriguez (1795-1883) in 1810. He was the grantee of Rancho San Lorenzo in 1841 and Rancho Ex-Mission Soledad in 1845. Feliciano's son Francisco Maria Soberanes (1818-1887), was granted Rancho Sanjon de Santa Rita in 1841.
Feliciano's daughter, Maria Josefa Soberanes, was granted the two square league Rancho Los Coches in 1841. In 1839 Maria Josefa Soberanes married William Brunner Richardson, a tailor who had come from Baltimore, Maryland, seven years before. Rancho Los Coches became known as the Richardson Rancho.
With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored. As required by the Land Act of 1851, a claim for Rancho Los Coches was filed with the Public Land Commission in 1853, and the grant was patented to María Josefa Soberanes in 1883.