Structural and operating characteristics of hog production in 1975 are identified. Data from a sample survey and secondary sources reveal number of hog producers and sizes of enterprises, location of production, forms of ownership, general farm characteristics, details of production practices, specifics of facilities in use, and methods of marketing. Information is given by region for the three major types of hog producing enterprises: feeder pig production, farrow-to^-finish, and feeder pig finishing.