The website ihsa.org has regularly updated Illinois high school football scores. From the Sports and Activities drop-down menu on the main page, click on Boys Sports, Football. In addition to the score, you can click on Info for complete statistics from each game.
The ihsa.org website has other information for fans of high school football such as schedules, playoffs, records and results for state series and for conferences. The IHSA also has announcements, resources and a five-year high school football season calendar.
Illinois newspapers available online, such as the Chicago Tribune, cover high school football games in greater depth. Articles in these papers give fans details from the game that go beyond the score.