Summary:
ZIP code 19966 in Millsboro, Delaware, is served by three schools in the Indian River School District—two elementary schools and one middle school—with a combined enrollment of 2,258 students and no high school within the immediate area.
For parents, the most important takeaway is that the two elementary schools offer complementary strengths. East Millsboro Elementary School is the largest school (820 students) and shines in 5th grade, with strong ELA (44.29%) and math (39.72%) proficiency, plus exceptional 5th grade social studies (64.23%, above the state average). However, its 3rd grade scores lag significantly (24.55% ELA, 27.71% math). In contrast, Long Neck Elementary School excels in the early grades—3rd grade math proficiency is 43.09% and ELA is 36.59%, both above East Millsboro—but its performance declines by 5th grade. Long Neck also has the best attendance record (15.2% chronic absenteeism, below the state average) and the lowest per-student spending ($11,933).
The transition to Millsboro Middle School is a critical challenge. Despite spending the most per student ($14,048), it underperforms district and state averages in nearly every subject, with 8th grade science proficiency at just 11.24% and chronic absenteeism at 22.0%—the highest in the area. Math scores are a relative bright spot across the ZIP code, with several grades exceeding state averages, but science and ELA remain persistent weaknesses. The district itself ranks in the top 30% of Delaware, yet these schools sit in the 31st–44th percentile, indicating room for improvement. Parents should note the year-over-year volatility in test scores, which may reflect changing student populations, and plan for the middle school transition as a key period requiring extra support.
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