Total enrollment
843
-113 (-12%) vs SY 2017-18
3 schools in Seneca
Illinois · Public K-12
Across the city, Seneca hosts 3 public K-12 schools teaching roughly 843 Illinois students (about 281 per campus).
7-year change in Seneca
SY 2017-18 vs SY 2024-25School count
3
0 (0%) vs SY 2017-18
% White
84%
was 91%
% Hispanic
11%
was 7%
% Black
1%
was 1%
% Asian
0%
was 0%
Source: NCES Common Core of Data, enrollment-weighted demographic averages
| Name | Level | Grades | Enrollment |
|---|---|---|---|
| Seneca Elem School South Campus | Middle | 05-08 | 209 |
| Seneca Grade School North Campus | Elementary | PK-04 | 256 |
| Seneca High School | High | 09-12 | 378 |
About Seneca
Seneca is a thinly populated Illinois city in terms of public-school footprint, with 3 schools and 843 students total.
Looking at the level breakdown, the city is built around 1 elementary, 1 middle, and 1 high.
Per-campus enrollment runs near 281, below the state mean of about 480.
Trend over the past 7 years. Across the same 7-year window, public-school enrollment declined 12%: 956 students in SY 2017-18 versus 843 in SY 2024-25. Demographically, the White share of enrollment contracted from 91% to 84%.
On allk12, the community for Seneca discusses enrollment trends, district policy changes, and bus-route updates. Members of the local community share what they see day-to-day.