California State Alliance of YMCAs Select Language 18A612A8-B407-4667-98E0-6C45814FB6EB Main navigation About Main menu About About Our Mission Staff & Board Alliance Members Initiatives Advocacy Find Your Y Main menu Find Your Y Find Your Y Careers Locations Impact Main menu Impact Impact Connected for Communities Partners Search Close Select Language All Locations Peninsula Family YMCA Find us 650-286-9622 1877 S Grant St, San Mateo CA 94402 Hours Monday5:30 am– 9 pm See more hours × HOURS Mon - Fri 5:30 am– 9 pm Sat - Sun 7 am- 5 pm More about this location Branch Home Visit the Website