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This paper have analysed in the first stage the efficiency of Korea's great-sphere municipalities using nonparametric data envelopment analysis(DEA) method. This allows for us to confirm that most great-sphere municipalities can improve efficiency by reducing spending expenditures with providing the residents of their regions with the same services. And efficiencies of heavily populated areas are higher than sparsely populated. But it is impossible for us to give politic advices to municipalities with only estimates of efficiency. Therefore, in order to know the effect of socio-economic factors on efficiency, as the second stage, my paper have regressed Kernel estimates of efficiency on the factors so that most financial factors affect positively efficiency and as a non-discretionary factor, the more college-educated people a municipality has, the higher efficiency it deserves. The role of socio-economic factors in efficiency, which was not got a line on in the first stage analysis, is revealed by the second stage; and by this we may give politic advices to municipalities.