Best high schools in St. Tammany Parish (2025)
Schools classified as high schools by NCES. Ranked by the Success Index (US) from official American data; 8 schools in St. Tammany Parish, Louisiana. Rank positions shown on each profile are within United States and Louisiana.
- Elementary Schools in St. Tammany Parish
- Middle Schools in St. Tammany Parish
- Traditional Public Schools in St. Tammany Parish
- Schools by Math Proficiency in St. Tammany Parish
- Schools by Reading Proficiency in St. Tammany Parish
- Lowest Student–Teacher Ratio in St. Tammany Parish
- Largest Schools in St. Tammany Parish
- 187Mandeville High SchoolMandeville · Public High88% Math proficiency · 2,006 students
- 283Fontainebleau High SchoolMandeville · Public High79% Math proficiency · 1,451 students
- 381Northshore High SchoolSlidell · Public High85% Math proficiency · 1,518 students
- 478Lakeshore High SchoolMandeville · Public High71% Math proficiency · 835 students
- 570Slidell High SchoolSlidell · Public High72% Math proficiency · 1,654 students
- 668Pearl River High SchoolPearl River · Public High67% Math proficiency · 781 students
- 767Covington High SchoolCovington · Public High62% Math proficiency · 1,600 students
- 864Salmen High SchoolSlidell · Public High66% Math proficiency · 1,091 students
| # | School | Sector | Success Index (US) | Key result | Students |
|---|---|---|---|---|---|
| 1 | Mandeville High School Mandeville · High · Grades 9–12 | Public | 86.9 Top 5% | 88% Math proficiency | 2,006 |
| 2 | Fontainebleau High School Mandeville · High · Grades 9–12 | Public | 83.0 Top 10% | 79% Math proficiency | 1,451 |
| 3 | Northshore High School Slidell · High · Grades 9–12 | Public | 80.9 Top 10% | 85% Math proficiency | 1,518 |
| 4 | Lakeshore High School Mandeville · High · Grades 9–12 | Public | 78.2 Top 10% | 71% Math proficiency | 835 |
| 5 | Slidell High School Slidell · High · Grades 9–12 | Public | 70.2 Top 25% | 72% Math proficiency | 1,654 |
| 6 | Pearl River High School Pearl River · High · Grades 9–12 | Public | 68.0 Top 25% | 67% Math proficiency | 781 |
| 7 | Covington High School Covington · High · Grades 9–12 | Public | 67.4 Top 25% | 62% Math proficiency | 1,600 |
| 8 | Salmen High School Slidell · High · Grades 9–12 | Public | 64.2 Top 50% | 66% Math proficiency | 1,091 |
Mandeville High School in Mandeville leads the 2025 list of high schools in St. Tammany Parish with a Success Index (US) of 86.9. Of the 8 schools shown, 8 are public.
For the full picture see the wider Louisiana high schools rankings, every school on the St. Tammany Parish page, or the comparison tool to put a shortlist side by side.
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Frequently asked questions
What is the best high school in St. Tammany Parish?
Mandeville High School in Mandeville, Louisiana ranks first among high schools in St. Tammany Parish with a Success Index (US) of 86.9 out of 100 (Enrollment: 2,006).
How are high schools in St. Tammany Parish ranked?
Each school's Success Index (US) combines 4 factors: math proficiency (30%), reading proficiency (30%), community advantage (fewer free/reduced-price lunch) (25%), students per teacher (15%). Each factor is a percentile against schools of the same type across United States. Schools with fewer than 60 students are excluded from rankings.
Are these 2025 rankings official?
No. They are computed by Success Tutoring from official American data (Urban Institute Education Data Portal (NCES CCD, EDFacts); NCES Common Core of Data). States set their own assessments and proficiency cut scores, so proficiency rates are most comparable within a state. Use the state rankings for like-for-like comparisons.