An analysis of four Utah retail selling areas was made to determine the changes in the market structure of the retail grocery industry of these markets. The study markets were Logan, Ogden, Salt Lake, and Provo-Orem. This study was an ex tension of the National Commission Food Marketing study of the retail food marketing industry. The major changes observed in the study markets were increasing population, dollar food sales, supermarket saturation levels and concentration ratios. The number of retail food outlets was decreasing. The barriers to entry in the study markets increased during the study period. There was substantial economic activity in the study markets during the study period. Several major chain food retailers entered and left the markets during the study period. Firm expansion in the retail grocery industry was accomplished by both external means and internal means.