For the 2026 school year, there are 15 public schools serving 1,934 students in Charles Mix County, SD.
The top-ranked public schools in Charles Mix County, SD are Cedar Grove Colony Elementary - 14, Platte - Geddes Elementary - 02 and Platte - Geddes Jr. High - 03. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
Charles Mix County, SD public schools have an average math proficiency score of 40% (versus the South Dakota public school average of 43%), and reading proficiency score of 49% (versus the 51% statewide average). Schools in Charles Mix County have an average ranking of 4/10, which is in the bottom 50% of South Dakota public schools.
Minority enrollment is 57% of the student body (majority American Indian), which is more than the South Dakota public school average of 34% (majority American Indian).
Best Public 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 | 44 students Student-teacher ratio: 15:1
Rank: #22.
Platte - Geddes Elementary - 02
(Math: 75-79% | Reading: 65-69%)
Rank:
Rank:
10/
Top 10%10
401 S Iowa Av
Platte, SD 57369
(605) 337-2468
Platte, SD 57369
(605) 337-2468
Gr: K-5 | 230 students Student-teacher ratio: 13:1 Minority enrollment: 11%
Rank: #33.
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 | 94 students Student-teacher ratio: 13:1 Minority enrollment: 13%
Rank: #44.
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 | 23 students Student-teacher ratio: 12:1
Rank: #55.
Wagner High School - 01
(Math: 40-49% | Reading: 80-89%)
Rank:
Rank:
8/
Top 30%10
101 Walnut Ave Sw
Wagner, SD 57380
(605) 384-5426
Wagner, SD 57380
(605) 384-5426
Gr: 9-12 | 201 students Student-teacher ratio: 12:1 Minority enrollment: 69%
Rank: #66.
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 | 22 students Student-teacher ratio: 7:1
Rank: #7 - 87. - 8.
Andes Central High School - 01
(Math: <50% | Reading: <50%)
Rank:
Rank:
6/
Top 50%10
1001 High St
Lake Andes, SD 57356
(605) 487-7671
Lake Andes, SD 57356
(605) 487-7671
Gr: 9-12 | 65 students Student-teacher ratio: 8:1 Minority enrollment: 80%
Rank: #7 - 87. - 8.
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 | 18 students Student-teacher ratio: 9:1
Rank: #99.
Platte - Geddes High School - 01
(Math: 21-39% | Reading: 60-69%)
Rank:
Rank:
5/
Bottom 50%10
400 Illinois Ave
Platte, SD 57369
(605) 337-3391
Platte, SD 57369
(605) 337-3391
Gr: 9-12 | 132 students Student-teacher ratio: 11:1 Minority enrollment: 13%
Rank: #1010.
Wagner Elementary - 02
(Math: 35-39% | Reading: 35-39%)
Rank:
Rank:
3/
Bottom 50%10
101 Walnut Ave Sw
Wagner, SD 57380
(605) 384-3393
Wagner, SD 57380
(605) 384-3393
Gr: K-4 | 333 students Student-teacher ratio: 10:1 Minority enrollment: 70%
Rank: #1111.
Andes Central Elementary - 02
(Math: 30-34% | Reading: 25-29%)
Rank:
Rank:
2/
Bottom 50%10
1001 High St
Lake Andes, SD 57356
(605) 487-5243
Lake Andes, SD 57356
(605) 487-5243
Gr: PK-5 | 184 students Student-teacher ratio: 13:1 Minority enrollment: 83%
Rank: #1212.
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 | 283 students Student-teacher ratio: 13:1 Minority enrollment: 73%
Rank: #1313.
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 | 51 students Student-teacher ratio: 7:1 Minority enrollment: 82%
Rank: n/an/a
101 Walnut Ave Sw
Wagner, SD 57380
(605) 384-4354
Wagner, SD 57380
(605) 384-4354
Gr: PK | 102 students Student-teacher ratio: 17:1 Minority enrollment: 64%
Rank: n/an/a
100 South Main
Marty, SD 57361
(605) 384-2212
Marty, SD 57361
(605) 384-2212
Gr: K-12 | 220 students Student-teacher ratio: 7:1
Charles Mix County Public Schools (Closed)
School
Location
Quick Facts
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 schools in Charles Mix County, SD?
The top-ranked public schools in Charles Mix County, SD include Cedar Grove Colony Elementary - 14, Platte - Geddes Elementary - 02 and Platte - Geddes Jr. High - 03.
How many public schools are located in Charles Mix County?
16 public schools are located in Charles Mix County.
What is the racial composition of students in Charles Mix County?
Charles Mix County public schools minority enrollment is 57% of the student body (majority American Indian), which is more than the South Dakota public schools average of 34% (majority American Indian).
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