We used the Braun-Blanquet method to study the vegetation of coastal wetlands in South Korea. Three habitat types were found, i.e., salt marshes, salt swamps, and sand dunes. These plant communities were classified as: 1) two groups (five associations each) in the salt marshes that comprised either annual herbaceous halophytes (Class Thero-Salicornietea), or biennial/perennial herbaceous species (Class Asteretea tripolii) 2) one group in the salt swamps consisting of five hydrophilous halo-tolerant associations (Class Phragmitetea); and 3) three groups in the sand dunes, including one association of annual herbaceous halophytes (Class Salsoletea komarovii), seven associations of herbaceous perennial halophytes (Class Giehnietea littoralis), and one association of shrub perennial halophytes (Class Viticetea rotundifoliae). These three habitat types accounted for the majority of the six main classifications of coastal vegetation distributed in South Korea.