This report presents statistical data for all Illinois public and private two-year and four-year colleges and universities extracted from the Fall 1975 Space Survey completed by the Illinois Board of Higher Education. Summary data by institution and totals and weighted means for types of institutions are provided on building efficiency (net assignable square feet compared to gross square feet), average weekly usage for classrooms and laboratories, distribution of space by type of room, and net assignable square footage per on-campus FTE (full-time equivalent) student. The data show that college buildings within the public community college system had a relatively high ratio of usable space to gross space when compared to other types of institutions. Although the public community colleges did not rank first among other institutions on measures of day utilization, when evening utilization rates were combined with day utilization rates the public community colleges ranked first in average weekly room hours of utilization for classrooms (30.5 hours) and laboratories (26.9 hours), and student station utilization rate for classrooms (27.1%) and laboratories (23.8%). Analysis of net assignable square feet (NASF) shows that the community colleges had 11.0 NASF for classroom space and 17.3 NASF for laboratory space per on-campus student FTE. (JDS)