This study surveyed vascular plants in the Namhae-gun area (Namhae Bridge and Sangju ? Geumsan District) of Hallyeohaesang National Park. Five field surveys were conducted between April and October, 2020. The identified vascular plants comprised 303 taxa, including 98 families, 218 genera, 277 species, three subspecies, and 23 varieties. Twelve taxa of endemic Korean plants were investigated, including Asarum maculatum Nakai and Hosta jonesii M. G. Chung. Peucedanum hakuunense Nakai, designated according to the IUCN Red List Category as near threatened (NT), was also identified. Sixteen floristic regional indicator plants comprised 5 taxa of IV degree and 11 taxa of III degree. Alien plants were recorded in 20 taxa, resulting in naturalization and urbanization indices of 6.6% and 6.2%, respectively. Additionally, two taxa of ecosystem-disturbing plants, Ambrosia artemisiifolia L. and Humulus japonicus Siebold and Zucc., were investigated.