Schools in Zip Code 60112

Cortland Elementary School is the only school listed in ZIP code 60112, serving grades K–5 and enrolling 523 students; it is part of DeKalb CUSD 428. Its 2025–2026 proficiency rates were below state results in every reported subject: 34% in all-grades English language arts (ELA) versus 56% statewide, 19% in mathematics versus 40%, and 26% in fifth-grade science versus 48%. The most important finding is that Cortland’s reported proficiency rates trail the state by about 21 to 22 percentage points across all three subject comparisons.

There is no second local school to rank above or below Cortland, so the clearest distinctions are between its grade-level results and comparisons with the district and state. Fourth-grade ELA was its strongest reported grade-level result relative to the state: 41% proficient, 15 percentage points below the state rate. Fifth-grade ELA was weaker at 32%, 23 points below the state, while third-grade ELA was 31%, 17 points below. In mathematics, third and fifth grades were 22 and 21 points below the state, respectively; the fourth-grade school result is not available. Cortland was above the district in all-grades ELA (34% versus 31%) and third- and fourth-grade ELA, but below the district in all-grades mathematics (19% versus 20%), fifth-grade ELA, fifth-grade mathematics, and fifth-grade science.

Results moved in different directions from 2024–2025 to 2025–2026: all-grades ELA rose by 5 percentage points, while mathematics fell by 4 points and fifth-grade science fell by 4 points. ELA’s gap with the state narrowed by 2 points, but the mathematics gap widened by 5 and the science gap by 11. SchoolDigger gives Cortland 0 stars and ranks it 1,577th of 1,737 Illinois schools, in the 9th percentile; its prior rank was 1,588th of 2,056, so the different group sizes make the rank positions difficult to compare. Chronic absenteeism was 13% in 2025–2026, below the district’s 26% and state’s 24%. Other context: the school had a 13:1 student–teacher ratio and 62% free/reduced lunch eligible in 2024–2025.