Rancho Guadalupe y Llanitos de los Correos was a 8,858-acre (35.85 km2) Mexican land grant in the Salinas Valley, in present-day Monterey County, California given in 1833 by Governor José Figueroa to Juan Malarín.
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.
Malarín 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.
[4] 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 Guadalupe y Llanitos de los Correos was filed with the Public Land Commission in 1852,[5][6] and the grant was patented to Mariano Malarín in 1865.