| District | City | Rating | Students | Schools | Grades | Zip Codes |
|---|---|---|---|---|---|---|
| O'Fallon Township High School District 203 | O Fallon | 10/10 Excellent · 94th pct | 2,521 | 1 | 9–12 | 1 |
| Freeburg Community High School District 77 | Freeburg | 10/10 Excellent · 93rd pct | 683 | 1 | 9–12 | 3 |
| Mascoutah Community Unit School District 19 | Belleville | 10/10 Excellent · 93rd pct | 4,152 | 5 | PK–12 | 3 |
| Millstadt Consolidated Community School District 160 | Millstadt | 10/10 Excellent · 90th pct | 711 | 2 | PK–8 | 0 |
| Wolf Branch School District 113 | Swansea | 9/10 Excellent · 88th pct | 779 | 2 | PK–8 | 0 |
| O'Fallon Community Consolidated School District 90 | O Fallon | 9/10 Excellent · 87th pct | 3,944 | 7 | PK–8 | 0 |
| New Athens Community Unit School District 60 | Lenzburg | 9/10 Excellent · 86th pct | 494 | 3 | PK–12 | 2 |
| Smithton Community Consolidated School District 130 | Smithton | 9/10 Excellent · 85th pct | 556 | 1 | PK–8 | 0 |
| Freeburg Community Consolidated School District 70 | Freeburg | 8/10 Good · 79th pct | 796 | 2 | PK–8 | 0 |
| Shiloh Village School District 85 | Shiloh | 8/10 Good · 73rd pct | 577 | 2 | PK–8 | 0 |
| Lebanon Community Unit School District 9 | Lebanon | 7/10 Good · 68th pct | 523 | 2 | PK–12 | 2 |
| St. Libory Consolidated School District 30 | Saint Libory | 6/10 Average · 52nd pct | 63 | 1 | K–8 | 0 |
| Belleville Township High School District 201 | Fairview Heights | 5/10 Average · 45th pct | 4,802 | 4 | 9–12 | 5 |
| Dupo Community Unit School District 196 | Dupo | 5/10 Average · 45th pct | 922 | 3 | PK–12 | 2 |
| Belleville School District 118 | Belleville | 5/10 Average · 41st pct | 3,390 | 11 | PK–8 | 0 |
| Belle Valley School District 119 | Belleville | 4/10 Below Average · 39th pct | 985 | 1 | PK–8 | 0 |
| Signal Hill School District 181 | Belleville | 4/10 Below Average · 39th pct | 291 | 1 | PK–8 | 0 |
| Collinsville Community Unit School District 10 | Caseyville | 4/10 Below Average · 38th pct | 6,140 | 12 | PK–12 | 1 |
| Central School District 104 | O Fallon | 3/10 Below Average · 29th pct | 600 | 2 | PK–8 | 0 |
| Pontiac-William Holliday School District 105 | Fairview Heights | 3/10 Below Average · 29th pct | 644 | 2 | PK–8 | 0 |
| Whiteside School District 115 | Belleville | 3/10 Below Average · 29th pct | 1,166 | 2 | PK–8 | 0 |
| Marissa Community Unit School District 40 | Marissa | 3/10 Below Average · 28th pct | 535 | 2 | PK–12 | 1 |
| Harmony Emge School District 175 | Belleville | 3/10 Below Average · 26th pct | 769 | 3 | PK–8 | 0 |
| Grant Community Consolidated School District 110 | Fairview Heights | 3/10 Below Average · 22nd pct | 562 | 2 | PK–8 | 0 |
| High Mount School District 116 | Swansea | 2/10 Poor · 14th pct | 327 | 1 | PK–8 | 0 |
| East St. Louis School District 189 | East Saint Louis | 1/10 Poor · 9th pct | 4,679 | 12 | PK–12 | 5 |
| Brooklyn Community Unit School District 188 | Lovejoy | 1/10 Poor · 1st pct | 147 | 3 | PK–12 | 1 |
| Cahokia Community Unit School District 187 | East Saint Louis | 1/10 Poor · 1st pct | 3,087 | 9 | PK–12 | 1 |
How St. Clair County compares
Together they enroll 44,845 students across 99 schools. The largest is Collinsville Community Unit School District 10 with 6,140 students. Districts here average 5.5/10, below the Illinois average of 5.6/10. Ratings range from 1/10 to 10/10.
School Districts in St. Clair County, Illinois
St. Clair County has 28 public school districts covering 27 zip codes. The top-rated district in St. Clair County is O'Fallon Township High School District 203 (10/10). Ratings are based on the share of students proficient in reading and math on state assessments (IAR 2023–24), ranked against all districts in Illinois. Directory details come from NCES CCD 2024–25.
Enter your zip code on any page to confirm your exact district assignment — district boundaries are address-specific and may not follow county or city lines.
Frequently Asked Questions
How many school districts are in St. Clair County, IL?
28 school districts serve zip codes in St. Clair County, IL. This page lists each one with its rating, enrollment, grade span and the zip codes it covers.
What is the best-rated school district in St. Clair County, IL?
Of the districts serving St. Clair County, O'Fallon Township High School District 203 has the highest rating on this site at 10/10. That places it in the 94th percentile among Illinois school districts.
How are these school district ratings calculated?
Each rating is the share of students scoring proficient or above on Illinois reading and math assessments, ranked against other districts in Illinois and converted to a 1–10 scale. Percentiles compare districts within Illinois only, never across state lines.