Welcome to Eldred Central School District Welcome to Eldred Central School District Home of the Yellowjackets! Eldred Junior-Senior High School is the place to be! Situated in the southern part of Sullivan County, New York, Eldred Junior-Senior High School offers a unique, individualized school experience. Eldred is an all-regents high school, whose students are among the top performing in the nation. After school, Eldred is bustling with athletics, clubs, and performing arts groups. George Ross Mackenzie Elementary School was built in 1995 on land belonging to George Ross Mackenzie. Our elementary school is located in the southern part of rural Sullivan County, New York near the Delaware River.