This introductory guide to Census Bureau data that is currently available to microcomputer users on compact disc (CD-ROM) begins by explaining the types of information available, how CD-ROM works, and the hardware and software required to access the databases using a microcomputer. Descriptions of data currently available on CD-ROM include individual disks containing data on specific topics covered by the 1990 Census of Population and Housing, the most recent (1987) Economic Census, and the 1990 TIGER/Line Census. Options that enable microcomputer users to load subsets of the large files into spreadsheets, graphics packages, and other commercial software are also described. Ways in which economic and county and city data can be used are suggested, and sample tables displaying data on the balance of trade are provided. It is also noted that maps can be created from TIGER/LINE data with special software. A brief review of other information and/or publications available from the Bureau of the Census on this topic concludes this guide. (KRN)