Metro East Sun

Belleville Township High School District 201 had the highest enrollment among St. Clair County districts, welcoming 4,773 students during the 2021-22 school year, according to the Illinois State Board of Education report.

Of all the students welcomed in the 2021-22 school year, .

The most represented ethnicity among Belleville Township High School District 201 students was Black, accounting for 45.3% of the student population.

Among the 27 districts in St. Clair County, East St. Louis School District 189 ranked second in enrollment numbers with 4,618 students, while Mascoutah Community Unit School District 19 welcomed 4,154 students and ranked third in the 2021-22 school year.

Belleville Township High School District 201 roughly covers schools within St. Clair County with its main office in Belleville.

In the previous school year, East St. Louis School District 189 had the highest number of students among St. Clair County districts.

In 2022, Illinois had 1,925,415 students enrolled in a total of almost 4,000 schools. There were 130,467 teachers in the public schools, or roughly one teacher for every 15 students, compared to the national average of 1:16.

K-12 enrollment has been declining in Illinois for several years, influenced by demographic changes. Between the 2019–2020 and 2020–2021 school years, public and private K-12 enrollment fell by 3% (60,900 students), a significantly larger decline than the typical 0.5% to 1.5% annual decreases seen in the state over the last five years.

District	City (main office)	Total Enrollment
Belleville Township High School District 201	Belleville	4,773
East St. Louis School District 189	East St. Louis	4,618
Mascoutah Community Unit School District 19	Mascoutah	4,154
O'Fallon Community Consolidated School District 90	O'Fallon	3,799
Belleville School District 118	Belleville	3,395
Cahokia Community Unit School District 187	Cahokia	3,013
O'Fallon Township High School District 203	O'Fallon	2,497
Whiteside School District 115	Belleville	1,174
Belle Valley School District 119	Belleville	980
Dupo Community Unit School District 196	Dupo	941
Freeburg Community Consolidated School District 70	Freeburg	777
Harmony Emge School District 175	Belleville	766
Wolf Branch School District 113	Swansea	733
Millstadt Consolidated Community School District 160	Millstadt	720
Freeburg Community High School District 77	Freeburg	677
Pontiac-William Holliday School District 105	Fairview Heights	665
Smithton Community Consolidated School District 130	Smithton	553
Central School District 104	O'Fallon	552
Shiloh Village School District 85	Shiloh	546
Grant Community Consolidated School District 110	Fairview Heights	534
Marissa Community Unit School District 40	Marissa	506
Lebanon Community Unit School District 9	Lebanon	501
New Athens Community Unit School District 60	New Athens	483
High Mount School District 116	Swansea	345
Signal Hill School District 181	Belleville	298
Brooklyn Community Unit School District 188	Lovejoy	171
St. Libory Consolidated School District 30	St. Libory	50