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Best Public Schools in Zip Code 57223


At a glance
4
Schools
345
Students
Top rankedCastlewood High School - 0134th of 130 South Dakota high schools
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Biggest riser
Castlewood Middle School - 03 up 60 spots statewide this year
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Summary:

Zip code 57223 has four schools—two elementary schools, one middle school and one high school—with 345 students total, from 17 at Claremont Colony Elementary - 04 to 140 at Castlewood Elementary - 02. The clearest difference is between elementary and middle-school results: Castlewood Elementary is well above state results in math, while Castlewood Middle School - 03 is below in both subjects; Castlewood High School - 01 also reports strong graduation and ACT results. Overall, the schools’ results vary substantially by school and grade span.

Castlewood Elementary stands out most consistently: its all-grades math proficiency was 65%, 21 percentage points above the state’s 44%, and its ELA was 57%, 8 points above the state. Castlewood Middle was below state results in all-grades math (33% versus 44%, a gap of 11 points) and ELA (42% versus 49%, a gap of 7 points), although its 8th-grade ELA was 9 points above the state. Castlewood High reported a 100% graduation rate versus 88% statewide, and its 11th-grade ACT results were 8 points above the state in ELA, 9 in math and 5 in science. SchoolDigger ranked the high school 34th of 130 and the elementary school 78th of 203 in 2025–2026; the middle school ranked 108th of 151.

Recent results moved in different directions: from 2024–2025 to 2025–2026, Castlewood Elementary’s all-grades ELA fell 10 points and math fell 8, while Castlewood Middle’s ELA rose 3 points and math 4. Elementary grade 5 science was a notable exception to its stronger results, dropping 32 points to 16%. Ratios were 13 students per teacher at Castlewood Elementary, 18.2 at Castlewood Middle and 16.2 at Castlewood High in 2024–2025. Free/reduced lunch eligible figures that year were 26% at the elementary school, 18% at the middle school and 14% at the high school; Claremont Colony’s reported figure was 21% in 2022–2023. Claremont Colony’s latest test scores are suppressed, so its 2024–2025 results of 10% in ELA and 0% in math, and its SchoolDigger ranking of 300th of 300 that year, cannot establish its current standing.

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Cities Near Zip Code 57223

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SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the South Dakota Department of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.

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