Rancho San Pablo was a 17,939-acre (72.60 km2) land grant in present-day Contra Costa County, California given in 1823 by Governor Luís Antonio Argüello to Francisco María Castro (1775–1831), a former soldier at the San Francisco Presidio and one-time alcalde of the Pueblo of San José. The grant was reconfirmed by Governor José Figueroa in 1834 to the heirs of Francisco Castro, including Víctor Castro. The San Pablo grant covered what is now Richmond, San Pablo, and Kensington in western Contra Costa County.