For the 2026 school year, there are 4 public high schools serving 1,102 students in Washington County, MO.
The top-ranked public high schools in Washington County, MO are Potosi High School, Kingston High School and Citadel School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
Washington County, MO public high schools have an average math proficiency score of 33% (versus the Missouri public high school average of 36%), and reading proficiency score of 49% (versus the 51% statewide average). High schools in Washington County have an average ranking of 6/10, which is in the top 50% of Missouri public high schools.
Washington County, MO public high school have a Graduation Rate of 93%, which is more than the Missouri average of 89%.
The school with highest graduation rate is Kingston High School, with ≥95% graduation rate. Read more about public school graduation rate statistics in Missouri or national school graduation rate statistics.
Minority enrollment is 4% of the student body (majority Hispanic), which is less than the Missouri public high school average of 30% (majority Black).
Best Public High Schools in Washington County (2026)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Potosi High School
(Math: 38% | Reading: 55-59%)
Rank:
Rank:
7/
Top 50%10
1 Trojan Dr
Potosi, MO 63664
(573) 438-2156
Potosi, MO 63664
(573) 438-2156
Gr: 9-12 | 679 students Student-teacher ratio: 16:1 Minority enrollment: 6%
Rank: #22.
Kingston High School
(Math: 15-19% | Reading: 50-59%)
Rank:
Rank:
5/
Bottom 50%10
10047 Diamond Rd
Cadet, MO 63630
(573) 438-4982
Cadet, MO 63630
(573) 438-4982
Gr: 9-12 | 248 students Student-teacher ratio: 14:1 Minority enrollment: 3%
Rank: #33.
Citadel School
Special Education School
(Math: <50% | Reading: <50% )
Rank:
Rank:
5/
Bottom 50%10
400 S Mine
Potosi, MO 63664
(573) 438-2472
Potosi, MO 63664
(573) 438-2472
Gr: K-12 | 4 students Student-teacher ratio: 4:1
Rank: #44.
Valley High School
(Math: 25-29% | Reading: 30-34%)
Rank:
Rank:
3/
Bottom 50%10
1 Viking Dr
Caledonia, MO 63631
(573) 779-3515
Caledonia, MO 63631
(573) 779-3515
Gr: 7-12 | 171 students Student-teacher ratio: 10:1 Minority enrollment: 2%
Washington County Public Schools (Closed)
School
Location
Quick Facts
#2 Viking Drive
Caledonia, MO 63631
(573) 766-5689
Caledonia, MO 63631
(573) 766-5689
Gr: K-2 | 96 students Student-teacher ratio: 32:1 Minority enrollment: 2%
Citadel (Closed 2023)
Special Education School
400 South Mines
Potosi, MO 63664
(573) 438-2472
Potosi, MO 63664
(573) 438-2472
Gr: Inquire with school | 10 students Student-teacher ratio: 10:1 Minority enrollment: 10%
400 N Mine
Potosi, MO 63664
(573) 438-9863
Potosi, MO 63664
(573) 438-9863
Gr: PK | 60 students Minority enrollment: 7%
Frequently Asked Questions
What are the top-ranked public high schools in Washington County, MO?
The top-ranked public high schools in Washington County, MO include Potosi High School, Kingston High School and Citadel School.
How many public high schools are located in Washington County?
4 public high schools are located in Washington County.
What is the racial composition of students in Washington County?
Washington County public high schools minority enrollment is 4% of the student body (majority Hispanic), which is less than the Missouri public high schools average of 30% (majority Black).
Which public high schools in Washington County are often viewed compared to one another?
Popular comparisons of public high schools in Washington County include: Kingston High School vs. Potosi High School, Potosi High School vs. Kingston High School
Recent Articles
Year-Round Schooling in 2026: Updated Parent Guide
Explore the latest 2026 data, trends, costs, and parent planning tips in the ongoing debate over year-round schooling vs the traditional calendar.
No Child Left Behind: Past, Present, and Future of U.S. School Policy
Explore how No Child Left Behind evolved into ESSA, what it means for 2025‑26 schooling, and what parents need to know about testing, admissions planning, and funding.
Understanding Public School Fees & Optional Costs Guide
Discover what public school fees are required versus optional, with 2026 updates for parents, students, and educators on budgeting and planning.