The purpose of this study was to examine the impact of various types of living accommodations on the academic performance of college freshmen at West Chester State College (Pennsylvania). Three types of housing were defined: single-sex dormitories, coeducational dormitories, and commuter living accommodations. The association of housing arrangements with academic achievement was studied using a measure of over- or underachievement. A random sample of students was used, and their predicted grades, based on several variables, were subtracted from actual grades in fall 1976 to obtain an achievement index for each student. A one-way analysis of variance was performed on the achievement means of each of the three housing groups. No significant differences were found between the achievement index means of the groups. However, students living in single-sex dormitories achieved higher grade-point averages than predicted, while those in coed dormitories and commuters had grade-point averages below those predicted. A review of existing policy on housing freshmen is suggested, as is further research. (Author/MSE)