Fiscal year (FY) 1987 results of the annual unit cost study of the Illinois public community colleges are presented in this report, based on data on course offerings, enrollments, and costs provided by the colleges. After an initial summary overview, data and analyses are presented showing net instructional unit costs for FY 1987 compared with previous years; net instructional unit cost, full instructional unit cost, and total institutional unit cost; net instructional unit cost by cost categories; indirect instructional support unit cost; net instructional unit cost by the seven instructional cost categories and by subject area; and unit cost comparisons. Highlighted findings include the following: (1) the FY 1987 state average instructional unit cost in the 39 public community colleges in Illinois was $99.82, representing an increase of $7.79 (8.5%) from FY 1986; (2) the state average for full instructional unit cost was $104.80, while the average total institutional unit cost was $112.45; (3) state averages for the cost categories comprising instructional costs were $38.16 for direct salary, $7.26 for direct department cost, $1.16 for direct equipment cost, $38.63 for allocated indirect cost, $14.10 for operation and maintenance, and $0.51 for building rental; and (4) state averages for support services were $8.38 for academic administration and planning, $3.88 for learning resources, $10.88 for student services, $2.88 for administrative data processing, and $6.42 for general administration. (UCM)