It is located one mile (1.6 km) north of Middle Country Road (Route 25) on Marshall Drive.

As suburban growth spread into central Suffolk county in the 1950s, the new Middle Country Central School District was created in 1957 from the merger of the Selden and Centereach school districts.

Newfield opened in 1959[2] to serve the growing population, as neither district had ever had a high school.

In the past, students from the 9th grade were educated at Selden Junior High School, and this changed when the Junior High formally became Selden Middle School and the 9th grade was passed on to Newfield.

Newfield fields a number of varsity and junior varsity athletic teams, in Section 11, Division 1 of the New York State Public High School Athletic Association, including baseball, basketball, bowling, cheerleading, cross country, fencing, field hockey, football, golf, gymnastics, lacrosse, swimming, soccer, softball, tennis, track & field, volleyball (girls), and wrestling.