Rancho de las Pulgas was a 35,240-acre (142.6 km2) 1795 Spanish land grant in present-day San Mateo County, California, to José Darío Argüello. The literal translation is "Ranch of the Fleas," named after the exceptional abundance of fleas in the area.[1][2] The grant was bounded by San Mateo Creek on the north and San Francisquito Creek on the south, and extended about one league from San Francisco Bay to the hills.[3] The grant encompassed present-day San Mateo, Belmont, San Carlos, Redwood City, Atherton and Menlo Park.[4]