The 3 middle schools for Champaign are Edison, Franklin and Jefferson.
You can find a map of the school locations here:
Info on redistricting for the high schools here:
To actually answer your original question... The closest grade schools to Ashland Park are Garden Hills, Stratton and Washington. Which grade school you are in will determine which middle school you are in.
If you'd like to talk to someone in the school administration you can find contact the Family Information Center here: http://www.champaignschools.org/FIC.html