Market Data Retrieval (MDR) maintains a data base covering all United States schools, colleges, and public libraries. A recently completed MDR survey of 15,314 U.S. school districts has determined that 24,642 public schools now use computers in instruction, a 56.2 percent increase over the number of schools using instructional computing when a similar telephone survey was conducted during 1981-82. Key findings of the survey were: (1) of 15,314 U.S. school districts, 8,947 (58 percent) use instructional computers, up 39 percent from 1981-82; (2) of 82,422 U.S. school buildings, 24,642 (30 percent) now use instructional computing, up 56.2 percent from Fall 1981; (3) fastest growth in use of computers occurred in elementary schools (up 80 percent) with a total of 10,499 of the nation's 52,000 elementary schools now using instructional computing; and (4) grade level, size of school, and wealth of school continue to be the key factors in determining whether schools will acquire computers for instructional purposes. Among the data included in this report are: microcomputer distribution by state for 1981 and 1982 (broken down by district and schools), microcomputer usage compared to building enrollment, and microcomputer usage compared to instructional spending. (JN)