For the 2026 school year, there are 9 public middle schools serving 786 students in Charles Mix County, SD.
The top-ranked public middle schools in Charles Mix County, SD are Cedar Grove Colony Elementary - 14, Platte - Geddes Jr. High - 03 and Lakeview Colony Elementary - 05. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
Charles Mix County, SD public middle schools have an average math proficiency score of 35% (versus the South Dakota public middle school average of 39%), and reading proficiency score of 48% (versus the 49% statewide average). Middle schools in Charles Mix County have an average ranking of 3/10, which is in the bottom 50% of South Dakota public middle schools.
Minority enrollment is 62% of the student body (majority American Indian), which is more than the South Dakota public middle school average of 42% (majority American Indian).
Best Public Middle Schools in Charles Mix County (2026)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Cedar Grove Colony Elementary - 14
(Math: ≥80% | Reading: 60-79%)
Rank:
Rank:
10/
Top 5%10
36926 266th St
Platte, SD 57369
(605) 337-2468
Platte, SD 57369
(605) 337-2468
Gr: K-8 | 43 students Student-teacher ratio: 14:1
Rank: #22.
Platte - Geddes Jr. High - 03
(Math: 55-59% | Reading: 60-64%)
Rank:
Rank:
9/
Top 20%10
400 Illinois Ave
Platte, SD 57369
(605) 337-3391
Platte, SD 57369
(605) 337-3391
Gr: 6-8 | 100 students Student-teacher ratio: 13:1 Minority enrollment: 11%
Rank: #33.
Lakeview Colony Elementary - 05
(Math: 40-59% | Reading: 60-79%)
Rank:
Rank:
8/
Top 30%10
28748 386th Ave
Lake Andes, SD 57356
(605) 487-7655
Lake Andes, SD 57356
(605) 487-7655
Gr: K-8 | 25 students Student-teacher ratio: 13:1
Rank: #44.
Platte Colony Elementary - 10
(Math: ≥50% | Reading: ≥50%)
Rank:
Rank:
8/
Top 30%10
35271 270 St
Platte, SD 57369
(605) 337-3391
Platte, SD 57369
(605) 337-3391
Gr: K-8 | 23 students Student-teacher ratio: 8:1
Rank: #55.
Tripp-delmont Jr. High - 02
(Math: <50% | Reading: <50%)
Rank:
Rank:
6/
Top 50%10
105 S Sloan
Pickstown, SD 57367
(605) 935-6766
Pickstown, SD 57367
(605) 935-6766
Gr: 7-8 | 20 students Student-teacher ratio: 10:1 Minority enrollment: 5%
Rank: #66.
Wagner Middle School - 03
(Math: 21% | Reading: 44%)
Rank:
Rank:
2/
Bottom 50%10
101 Walnut Ave Sw
Wagner, SD 57380
(605) 384-3913
Wagner, SD 57380
(605) 384-3913
Gr: 5-8 | 274 students Student-teacher ratio: 14:1 Minority enrollment: 68%
Rank: #77.
Andes Central Middle School - 04
(Math: 20-29% | Reading: 20-29%)
Rank:
Rank:
1/
Bottom 50%10
1001 High St
Lake Andes, SD 57356
(605) 487-5207
Lake Andes, SD 57356
(605) 487-5207
Gr: 6-8 | 56 students Student-teacher ratio: 9:1 Minority enrollment: 80%
Rank: n/an/a
100 South Main
Marty, SD 57361
(605) 384-2212
Marty, SD 57361
(605) 384-2212
Gr: K-12 | 245 students Student-teacher ratio: 9:1
Rank: n/an/a
400 S Illinois Ave
Platte, SD 57369
(605) 337-3391
Platte, SD 57369
(605) 337-3391
Gr: 6-8
Charles Mix County Public Schools (Closed)
School
Location
Quick Facts
1001 High St
Lake Andes, SD 57356
(605) 487-7671
Lake Andes, SD 57356
(605) 487-7671
Gr: 9-12 | 62 students Student-teacher ratio: 8:1 Minority enrollment: 71%
Po Box 197
Geddes, SD 57342
(605) 337-3382
Geddes, SD 57342
(605) 337-3382
Gr: PK-6 | 47 students Student-teacher ratio: 9:1 Minority enrollment: 13%
Po Box 197
Geddes, SD 57342
(605) 337-3382
Geddes, SD 57342
(605) 337-3382
Gr: 9-12 | 34 students Student-teacher ratio: 9:1
Po Box 197
Geddes, SD 57342
(605) 337-3382
Geddes, SD 57342
(605) 337-3382
Gr: 7-8 | 12 students Student-teacher ratio: 12:1 Minority enrollment: 8%
Po Box 140
Platte, SD 57369
(605) 337-2468
Platte, SD 57369
(605) 337-2468
Gr: K-8 | 6 students
28949 377th Ave
Lake Andes, SD 57356
(605) 487-7655
Lake Andes, SD 57356
(605) 487-7655
Gr: K-8 | 22 students Student-teacher ratio: 11:1
Po Box 140
Platte, SD 57369
(605) 337-2468
Platte, SD 57369
(605) 337-2468
Gr: K-8 | 24 students Student-teacher ratio: 12:1
Po Box 140
Platte, SD 57369
(605) 337-2468
Platte, SD 57369
(605) 337-2468
Gr: PK-6 | 177 students Student-teacher ratio: 13:1 Minority enrollment: 1%
Po Box 140
Platte, SD 57369
(605) 337-3391
Platte, SD 57369
(605) 337-3391
Gr: 9-12 | 136 students Student-teacher ratio: 12:1
Po Box 140
Platte, SD 57369
(605) 337-3391
Platte, SD 57369
(605) 337-3391
Gr: 7-8 | 55 students Student-teacher ratio: 14:1
Frequently Asked Questions
What are the top-ranked public middle schools in Charles Mix County, SD?
The top-ranked public middle schools in Charles Mix County, SD include Cedar Grove Colony Elementary - 14, Platte - Geddes Jr. High - 03 and Lakeview Colony Elementary - 05.
How many public middle schools are located in Charles Mix County?
9 public middle schools are located in Charles Mix County.
What is the racial composition of students in Charles Mix County?
Charles Mix County public middle schools minority enrollment is 62% of the student body (majority American Indian), which is more than the South Dakota public middle schools average of 42% (majority American Indian).