The Saudi Postal Corporation (Saudi Post), the official postal service of Saudi Arabia, made a strategic decision to harmonize its postal services with international norms. A central goal of this endeavor was the establishment of a comprehensive mailing and residential address system covering the entire country. Leveraging GIS technology, Saudi Post developed the Unified National Addressing System and introduced a nationwide postal code system. GIS played a pivotal role in modernizing and streamlining the workflow, resulting in improved efficiency and timeliness.