A new address system based on road name(Road Name Address) has been introduced since April, 2007. By the Enforcement Ordinance(2007) we should use only Road Name Address nationwide from 2012. If Road Name Address system is introduced with keeping current address system based on lot number and current postal code system, many problems such as the followings are anticipated. Those problems include confusion of sorting process by duplex address notation, unavoidable route division by deliver area boundary, improperly matching problem between address and postal code. Hereafter inefficiency and turmoil are expected in collection and delivery work of postal letter. Therefore the change of Postal Code System and renumbering of Postal Code are required to increase the efficiency of postal work.
In this paper, we analyzed the effect of delivery area and postal code by introducing road name address system, and suggested improvement directions through the benchmarking of advanced countries. Considering those directions we proposed four new alternatives for postal code system and evaluated these. The suggested new postal code systems are expected to be utilized effective under the road name address system.