Intracoastal City is an unincorporated community in Vermilion Parish, Louisiana, United States. It is situated on the west bank of the Vermiliā¦Intracoastal City is an unincorporated community in Vermilion Parish, Louisiana, United States. It is situated on the west bank of the Vermilion River at its junction with the Gulf Intracoastal Waterway and has various port facilities and some permanent residents.