Rancho Zanjones was a 6,714-acre (27.17 km2) Mexican land grant in present day Monterey County, California given in 1839 by Governor protem Manuel Jimeno to Gabriel de la Torre. The grant extended along the north bank of the Salinas River east of present day Chualar.
Juan Malarin (1792–1849), a sea captain from Peru, came to California in 1822, and was made a Lieutenant in the Mexican Navy. He made Monterey his home, and in 1824 he married Maria Josefa Joaquina Estrada, a daughter of José Mariano Estrada, grantee of Rancho Buena Vista. Malarin was grantee of the two square league Rancho Guadalupe y Llanitos de los Correos in 1833, and the two square league Rancho Chualar in 1839. When Malarin died in 1849, his son, Mariano Malarin, took charge of the family estate. In 1859, Mariano Malarin (1827–1895) married Ysidora Pacheco (-1892), a daughter of Francisco Pacheco, owner of Rancho Ausaymas y San Felipe.
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 Zanjones was filed with the Public Land Commission in 1852, and the grant was patented to Mariano Malarin in 1866.
- Ogden Hoffman, 1862, Reports of Land Cases Determined in the United States District Court for the Northern District of California, Numa Hubert, San Francisco
- Diseño del Rancho Zanjones
- Hoover, Mildred B.; Rensch, Hero; Rensch, Ethel; Abeloe, William N. (1966). Historic Spots in California. Stanford University Press. ISBN 978-0-8047-4482-9.
- A Memorial and biographical history of the coast counties of central California, Chicago; Lewis Publishing Co. 1893
- Portraits of Isidora Pacheco and Mariano Malarín by Leonardo Barbieri
- United States. District Court (California : Southern District) Land Case 108 SD
- Report of the Surveyor General 1844 - 1886