Questionnaires were mailed to all 1,010 Illinois public school districts to collect data on general aspects of the districts and of the school library media program, program staff and materials collection, cataloging, accessibility, audiovisual resources and services, financial expenditures and affiliation with ILLINET (Illinois Library and Information Network). Analyses of the responses received from 493 school districts indicate that (1) most school districts have separate library rooms; (2) the average number of cataloged books is 15 per enrolled student; (3) school library media centers are typically open 6 to 7 hours per day; (4) over 90% of the centers have available 16mm film, filmstrip, slide, overhead and opaque projectors, phonographs, and a cassette recorder and/or playback machine; (5) only 11% of the districts report the availability of a microcomputer; (6) expenditures for all pruposes other than salaries averaged $14 per pupil; and (7) just under one-half of the respondents are affiliated with ILLINET. Appendices include a survey questionnaire form and data for each responding school district, and 30 pages of basic tables which present the distribution of responses by enrollment size group, geographic area, grade levels served, number of attendance centers, and a statewide estimate. (Author/LMM)