West Menlo Park is a census-designated place and an Unincorporated community in San Mateo County, California, located between the majority of City of Menlo Park, the Town of Atherton, the Sharon Heights neighbourhood of Menlo Park and Stanford University (in Santa Clara County). The area consists of suburban housing and a small business district along Alameda de las Pulgas (literally, "Avenue of the Fleas"), often just referred to as "the Alameda", which extends the length of the Rancho de las Pulgas land granted to the Argüello family. West Menlo Park is served by the Las Lomitas School District and Menlo Park Fire District.
West Menlo Park has a population of over 3,659 people. West Menlo Park also forms part of the wider San Francisco Bay metropolitan area which has a population of over 12,594,831 people.