Recently SSM (Super-Supermarket) has been regulated with distance; however, there is no regulation about size of SSM. Moreover, related literatures have discussed that the size of SSM is simply examined as a main factor influencing on total supermarket sales. This study focuses on identifying the trends of shop-area size of SSM and investigating the effects of the size of SSM on sales increment of SSM. The study sample was composed of 395 SSM of three franchises in Korea with sales data in 2009. For analyses, a regression model was conducted with sales of SSM as the dependent variable. Results show that the size of SSM in large cities is decreased; however, the size of SSM in local area is increased. In addition, when the shop-area of SSM is increased by 1㎡, the sales of SSM is increased by 0.05%, and when the number of annual average buyers are increased by 1 person, the sales of SSM is increased by 0.1%. Finally, the sales of SSM in Seoul Metropolitan Area, Kangwon-Do, and Chungchung-Do are about 9.4%~27.4% higher than the sales of SSM in other place. Based on the results, it is suggested that the regulation for the size of SSM should be considered by local governments.