If you are concerned about class sizes, check the college’s online schedule to see if these are listed. Average class sizes may be misleadingly lower than the average class size a given student will encounter in college, since the more common and popular classes will be larger, particularly at lower levels and in more popular majors.
For example, at Princeton, some common courses (e.g. general chemistry, organic chemistry for biology majors and pre-meds, introductory economics, calculus) are provisioned for hundreds of students: https://registrar.princeton.edu/course-offerings/search_results.xml?term=1182&coursetitle=&instructor=&distr_area=&level=&cat_number=&subject=CHM&subject=ECO&subject=MAT&sort=SYN_PS_PU_ROXEN_SOC_VW.SUBJECT%2C+SYN_PS_PU_ROXEN_SOC_VW.CATALOG_NBR%2CSYN_PS_PU_ROXEN_SOC_VW.CLASS_SECTION%2CSYN_PS_PU_ROXEN_SOC_VW.CLASS_MTG_NBR&submit=Search