Optimum Size of School Districts Relative to Selected Costs

Economic efficiency of public school districts was explored by utilization of the concept of economies and dis‐economies of scale. An optimum size relative to costs was discovered by analyzing the data with curvilinear least squares regression and also with the differential calculus. The sample was taken from elementary, high school, and K–12 (unit) districts in the state of Illinois, U.S.A. Suggestions for further research on the general notion of optimum size of school districts are presented.