what county is menlo park, ca?
Menlo Park, CA. Menlo Park is located in west California. Menlo Park is part of San Mateo County. Menlo Park has 9.79 square miles of land area and 7.63 square miles of water area. As of 2010-2014, the total Menlo Park population is 32,792, which has grown 6.52% since 2000.