The analyses of inter-regional output to output multipliers show that the regions that supply much intermediate inputs into the other regions, have greater intra-regional output to output multipliers than those of regions that receive much intermediate inputs from other regions. On the inter-regional output linkages, Seoul and Kyungki-Do have great influences on the other regions by providing intermediate inputs into them. A hypothesis tells that metropolitan cities closely relate with the rear provinces by supplying services,particularly producer services, and the provinces provide manufacturing goods into the cities. The relation can narrowly hold due to the influences of Seoul and Kyungki-Do on the other regions in Korea. The trade volumes between a region and near regions are greater than those with remote regions. Thereby the inter-regional output linkages between them are strengthened. It seems that the relation holds due to the transaction cost among regions. In the medium-term analysis, the cumulative causation of the regional growth paths works in the regional inter-industry output linkages, which may be a factor to deepen the growth differentials. For the balanced regional growth, public sectors have exerted possible efforts to provide the materials and labor inputs into the underdeveloped regions’ production sides.