Port Sulphur is a unincorporated community on the West Bank of the Mississippi River in Plaquemines Parish, Louisiana, United States.

[3] The Grande Ecaille mine was the largest sulphur deposit in the world when it began operation in 1933, and remained in production until 1978.

At some point, most of the company-owned land not necessary for the sulphur operation was transferred to Plaquemines Parish or sold to private owners.

The golf course land located on LA 23, just south of the former Freeport property, was originally a neighborhood of the company townsite.

In the months following Katrina, some residents moved back to Port Sulphur in trailers and modular homes provided by the Federal Emergency Management Agency.

[citation needed] By November 2006, in the post-Katrina period, the post office and several businesses had reopened, and Highway 23 had some street lights added.

Due to the usage of modular buildings and trailers in the period, Jeré Longman described it as "a feel of impermanence and uncertainty.

[14] Prior to 2005 Port Sulphur High School (PK-12) served the community,[15] but Hurricane Katrina damaged the original building.