We are a complete directory service of 3d 4d ultrasound centers in Daly City. So, if you are looking for 3d 4d ultrasound centers in Daly City for 3d 4d ultrasound, use our complete directory of Daly City ultrasound centers to Find a 3d ultrasound center near to your home in Daly City. Daly City is a city in San Mateo County, California, United States. It is the largest city in San Mateo County with a population of 103,621. It is named after the businessman and landowner John Daly. The latitude of Daly City is 37.705N. The longitude is -122.46W. It is in the Pacific Standard time zone. Elevation is 407 feet.