Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal
records, no number is typed in by an editor. District totals are aggregated directly from the schools reporting under this district in the source records. See our
editorial standards & corrections policy, the
methodology behind these numbers, or
report a data error. Data current as of June 2026.
Crystal Lake, Illinois - 4 schools
An equity score of 32/100 ranks Chsd 155 #516 of 763 districts in Illinois (state average 38). Derived live from how evenly resources are distributed across the district's schools.
At $22,088 per pupil, Chsd 155 ranks #112 of 848 Illinois districts by per-pupil spending (Illinois districts). NCES F-33 finance data.
5,405
Total Enrollment
4
Schools
$22,088
Per-Pupil Spending
High
School Types
District-Level NCES Analysis
Chsd 155 operates 4 public schools serving 5,405 students, placing it among the smallest districts in Illinois. The school portfolio breaks down into 4 high schools, a small enough portfolio that most families will interact with nearly every campus in the district at some point. These enrollment and school figures come from the NCES Common Core of Data (CCD) 2024-25 release, and the district is based in Mchenry County.
Per-pupil expenditure runs $22,088 according to the NCES F-33 School District Finance Survey, in the upper half of 848 Illinois districts by per-pupil spending. See how Illinois compares in our national per-pupil spending analysis. The funding mix is 62.5% local, 31.9% state, and 5.6% federal, a local-revenue-heavy mix that leaves the district more exposed to property-tax swings and local ballot measures than state-funded peers. The district's equity score is 32/100, ranked #516 of 763 in Illinois against a state average of 38, in line with the typical spread seen across the state for how evenly funding reaches its schools.
Academic infrastructure includes 4 of 4 schools offering Advanced Placement (76 AP courses district-wide), a 274.3:1 student-counselor ratio, somewhat above the 250:1 ASCA recommendation, and 21.1% chronic absenteeism from the 2021-22 Civil Rights Data Collection. Demographically, the student body averages 70.4% White, 21.7% Hispanic or Latino, 3.0% Asian across the district's schools. Its most demographically mixed campus is Crystal Lake South High School, with a diversity index of 51.0/100.
Crystal Lake Central High School accounts for 26.7% of all Chsd 155 student enrollment
That concentration means Chsd 155-wide averages can mask substantial variation outside the dominant entity. Grade band: high. A single dominant campus often anchors a district's program offerings and staffing patterns; the share helps explain why district-wide averages may not reflect the typical neighbourhood-school experience. When one entity dominates a region's footprint, its programmatic and budget decisions effectively set policy for a majority of the affected population.
Chsd 155 student-counselor ratio is 274:1 — near the typical range (US average ~408) — within the typical range for U.S. public districts
student-counselor ratio is the simplest comparative metric but it does not capture the full picture: the ratio counts FTE counselors against total enrollment, districts that contract intervention or social-emotional staff outside the counselor classification may be under-counted Variation between sub-units within Chsd 155 is typically wider than the Chsd 155-aggregate figure suggests.
Chsd 155 chronic absenteeism rate is 21.1% — near the typical range (US average ~28) — aligned with the national post-pandemic baseline of roughly 28% chronic absenteeism
chronic absenteeism rate is the simplest comparative metric but it does not capture the full picture: a student is chronically absent if they miss ≥10% of enrolled days for any reason, illness, family obligations, or disengagement Variation between sub-units within Chsd 155 is typically wider than the Chsd 155-aggregate figure suggests.