The conference was split up into two divisions starting in the 2006–07 season and consists of 14 teams total. All enrollments and classifications are from the Illinois High School Association website.
Johnsburg High School and Grayslake North High School joined the conference in the 2006–07 season.
During the 2009–2010 season, Woodstock North High School joined the conference as a full member, and, as a result, Woodstock High School moved down to the Fox Division, and Huntley High School moved up to the Valley Division.
^The state series class which a school competes in not only depends on the school's student population, but on the sport or activity. Some activities divide schools into two classes, some into three, and others into four. The listing here is in the order of two class, three class, and four class. The more "A"s in a class, the larger the schools competing. For more information on this, see Illinois High School Association#State Series Format.
^Schools are not assigned a classification for football until they have qualified for the playoffs each year. A school's classification not only depends on their student population, but on the populations of the other schools who have qualified. Thus, some schools routinely move between classes.
^Naqvi, Jameel (11 November 2009), "Hampshire to join Fox Valley Conference", Daily Herald, retrieved 9 January 2010, "The Community Unit District 300 school board voted unanimously Monday to move Hampshire High from the Big Northern to the Fox Valley Conference, where it will face stiffer competition from larger schools."