Social scientists have increasingly come to recognize the informal economy as a prominent and permanent structural feature of modern society. Rural sociologists have made a considerable contribution to this literature, demonstrating informal work to factor prominently in the livelihood strategies of rural Americans. Despite this scholarly attention significant gaps persist in our understanding of the informal economy. Drawing on data from a survey of family households in nonmetropolitan Pennsylvania, this paper examines the contours and correlates of informal work. The results make a strong case that participation in informal work is widespread and most often combined with formal work as a household livelihood strategy. While income is not found to be a significant correlate of informal work, it is found to influence the reasons cited for participation. Important correlates of informal work are identified and differences in the factors associated with informal work done to generate income (cash or in-kind) versus savings are revealed. (Contains 5 tables and 6 footnotes.)