Our project is to compile the Electronic Cultural Atlas of the Chosun dynasty. As the first fruit of our continuing efforts, we present here the administrative atlas of the Chosun period. This is the first time that the complete Chosun administrative atlas has been reconstructed. It includes all 330 prefectures and districts and covers the area of more than 220,000 ㎢. By making available the valuable experience gained in compilation of the historical administrative atlas, we hope for active exchange of information and expertise with the ECAI Projects in other countries.