What is Primary Education also called in the United States?

Primary education in the United States (also called elementary education) refers to the first seven to nine years of formal education in most jurisdictions, often in elementary schools, including middle schools. Preschool programs, which are less formal and usually not mandated by law, are generally not considered part of primary education. In 2016, there were 88,665 elementary schools in the United States.

Source: Wikipedia