Nearly 4.3 million workers held two jobs or more at the same time in May 1973, representing 5.1 percent of employed persons. After a 1972 decline, 1973 saw an increase of 500,000 more moonlighters. Four-fifths of all moonlighters were men. The difference between the multiple job-holding rates of Negro and of white workers was not statistically significant. Men whose primary jobs were as teachers below the college level or as protective service workers had the highest moonlighting rates. Men who were postal workers on their first jobs also had a high multiple job-holding rate. Most male multiple jobholders held a full-time job while working at a second job, but female moonlighters were about equally divided between those who had two part-time jobs and those who had a full-time and a part-time job. A major part of the document is devoted to supplementary tables. (MW)