Marian Central Catholic began competing in the ESCC for football in the 2014–2015 season.
The distance between the furthest schools (Carmel and Marian Catholic) is approximately 66 miles (106.2 km).
In 1970, Joliet Catholic temporarily left, with four new schools joining: Marist, St. Joseph, St. Patrick, and St. Viator.
In 2022, Marian Central Catholic High School in Woodstock IL, withdrew from the conference.
[11] The conference sponsors competition for men and women in basketball, cross country, golf, lacrosse, soccer, tennis, track and field, and volleyball.
All of these sports have state tournaments sponsored by the Illinois High School Association (IHSA).
The following teams, while members of the ESCC, finished in the top four of their respective state tournaments sponsored by the IHSA.