Reed-Custer High School is part of the Interstate 8 Conference. In addition to RCHS, the following 11 schools are part of this conference:

• Coal City High School
• Dwight High School
• Herscher High School
• Lisle High School
• Manteno High School
• Peotone High School
• Plano High School
• Sandwich High School
• Seneca High School
• Westmont High School
• Wilmington High School