The University of Illinois at Urbana-Champaign (UIUC), is the oldest, largest and most prestigious campus in the University of Illinois system. The university is composed of 18 Colleges and Institutes that offer more than 150 programs of study. Its campus includes 272 major buildings on 1,458 acres (5.90 kmē) in the twin cities of Champaign and Urbana, and has an annual budget of more than $1 billion.
As of Summer 2007, 42,728 students from all 50 states and 100 nations were enrolled; 31,472 were undergraduate students and 11,256 were graduate students. Until 1998, UIUC was one of the 10 largest universities in the United States in terms of student enrollment.