Why CPS uses tiers at all
Until 2009, CPS used race-based admissions for Selective Enrollment programs. After legal challenges to race-based public school admissions (Parents Involved in Community Schools v. Seattle, 2007), CPS switched to a socioeconomic-based system designed to maintain diversity while complying with the new legal landscape.
The 4-tier system replaced the old quotas. Every Chicago residential address belongs to one of 4 Tiers based on the U.S. Census Block Group's socioeconomic profile.
How tiers are calculated
CPS uses six U.S. Census variables for each block group:
Median family income, percent single-parent households, percent of households where adults speak a language other than English at home, percent of homes that are owner-occupied, adult educational attainment, and the average attainment level of CPS students from that block group.
Block groups are ranked from most disadvantaged (Tier 1) to most advantaged (Tier 4), with each tier containing roughly 25% of CPS school-age children.
The tier is recalculated periodically as Census data updates, so an address can switch tiers between cycles. Most don't — the system updates roughly every 5 years.
How seats are distributed
When CPS allocates seats at a given SEHS, the process happens in two steps:
Step 1 — Rank-all (top 30% of seats). The highest 900-point composite scores across the city, regardless of tier, fill the top 30% of seats. This is purely meritocratic.
Step 2 — Tier-balanced (remaining 70% of seats). The 70% is divided equally among the 4 tiers — 17.5% per tier. Within each tier, the highest scorers are admitted first.
This means a Tier 1 student who barely misses the rank-all cutoff competes only against other Tier 1 students for the remaining tier-allocated seats. The result: Tier 1 cutoffs are typically lower than Tier 4 cutoffs.
Recent tier cutoffs (approximate, 2024-2025 cycle)
Walter Payton: Tier 1 ≈ 838, Tier 4 ≈ 891, rank-all ≈ 893.
Northside Prep: Tier 1 ≈ 836, Tier 4 ≈ 887, rank-all ≈ 891.
Whitney Young: Tier 1 ≈ 813, Tier 4 ≈ 870, rank-all ≈ 880.
Jones: Tier 1 ≈ 814, Tier 4 ≈ 866, rank-all ≈ 877.
Lane Tech: Tier 1 ≈ 786, Tier 4 ≈ 838, rank-all ≈ 858.
Spread between Tier 1 and Tier 4 cutoffs at top schools is typically 50-60 points — a meaningful gap, but not enormous.
How to find your tier
The CPS Office of Access and Enrollment publishes a tier lookup tool on the GoCPS portal. Enter your residential address and it returns your tier. The tier comes from your home address, not your current school's address.
If you move during the application process, update the system. Your tier is locked at the time you submit the application.
Common questions
Question: 'Is the tier system fair?' This is debated. Critics argue families in Tier 1 sometimes have more resources than the address would suggest, and vice versa. Supporters argue the system has measurably increased diversity at top SEHS programs without violating the constitutional ban on race-based admissions. Reasonable people disagree.
Question: 'Can I move to change my tier?' Technically yes, but moving for the purpose of gaming admissions is not a great strategy. Cutoffs change year to year, and a family's stress and disruption rarely justify the marginal score change.
Question: 'What if I'm in a low tier but at a high-resource school?' The tier is based on residential address, not school. A student living in Tier 1 who attends a private elementary or strong magnet still gets the lower Tier 1 cutoff for SEHS admission.