Our school district has PreK-4 as elementary, 5th-6th as Intermediate (in it's own building) 7th-9th as Middle School (in it's own building) and 10th-12th as High School (in it's own building)
I like this separation a great deal and find it works well. We're in an unusual district though in that all of the buildings Pre-K through 12th grade are all on once campus with 5 elementary schools, 1 Intermediate school, 1 Middle School, and the HS plus the local community college right across the street...which makes it amazing for the HS students to schedule in duel credit courses.
