The most recent in an annual series on multiple jobholders, this report shows the number of U.S. workers holding two or more jobs at the same time by industry, occupation, and demographic characteristics, and outlines reasons for holding second jobs. Based primarily on information from the Current Population Survey, conducted and tabulated for the Bureau of Labor Statistics by the Bureau of the Census, the estimates in the report are for persons 16 years of age or older in the civilian noninstitutional population during the calendar week ending May 15, 1976. A two-page summary of the findings on multiple job holders begins the report. Following are four tables of figures showing primary and secondary jobs for persons holding two jobs or more, by industry, class of worker, and sex. A fifth table gives the main reasons for working at more than one job, with figures for age, sex, marital status, race, and usual weekly earnings. Appendix A, three pages of explanatory notes for the previous five tables, describes briefly the labor force concepts, sample design, estimating methods, and reliability of the estimates. Appendix B contains 14 reference tables giving more detailed information and figures as to the occupation (primary and secondary), industry group, class of worker, hours worked at secondary job, total hours worked, earnings on primary job, and personal characteristics of persons holding two jobs or more. Some tables are further categorized as to age, sex, and race. (BL)