The Women's Center at Mills Peninsula The Women's Center at Mills Peninsula 100 South San Mateo Drive, Suite 120 San Mateo, CA 94401 Phone: (650) 696-4188 Hours of Operation: Monday, Tuesday, Thursday, Friday, 8:30am - 5:00pm Wednesday, 8:30am - 7:30pm Saturday afternoons as needed 4th Floor Ultrasound ph: 650-696-4188 5th Floor Mammography ph: 650-696-4142 Services Offered: Breast Imaging, Biopsy, and Consultation, Ultrasound Click here for directions