* Last updated at 7:19 am on Saturday, May 24, 2025
— IC Catholic, see Elmhurst (IC Catholic)
— Ida Crown, see Skokie (Ida Crown)
— Illini Bluffs, see Glasford (Illini Bluffs)
— Illini Central, see Mason City (Illini Central)
— Illini West, see Carthage (Illini West)
— Illinois Lutheran, see Crete (Illinois Lutheran)
— Illinois Math and Science Academy, see Aurora (Illinois Math and Science Academy)
— Illinois School for the Deaf, see Jacksonville (Illinois School for the Deaf)
— Illinois School for the Visually Impaired, see Jacksonville (Illinois School for the Visually Impaired)
— Illinois Valley Central, see Chillicothe (Illinois Valley Central)
— Indian Creek, see Shabbona (Indian Creek)
— Instituto Health Science Charter, see Chicago (Instituto Health Science Charter)
— Intrinsic Charter, see Chicago (Intrinsic Charter)
— Intrinsic Charter-Downtown Campus, see Chicago (Intrinsic Charter-Downtown Campus)
— Iroquois West, see Gilman (Iroquois West)
— Islamic Foundation, see Villa Park (Islamic Foundation)