National Data Buoy Center

The John C. Stennis Space Center (SSC) is a NASA rocket testing facility in Hancock County, Mississippi (United States), on the banks of the Pearl River at the Mississippi–Louisiana border. As of 2012, it is NASA's largest rocket engine test facility. There are over 50 local, state, national, international, private, and public companies and agencies using SSC for their rocket testing facilities.

The Naval Meteorology and Oceanography Command (COMNAVMETOCCOM) or CNMOC, serves as the operational arm of the Naval Oceanography Program. Headquartered at the Stennis Space Center in Mississippi, CNMOC is an echelon three command reporting to United States Fleet Forces Command (USFLTFORCOM). CNMOC's claimancy is globally distributed, with assets on larger ships (aircraft carriers, amphibious ships, and command and control ships), shore facilities at fleet concentration areas, and larger production centers in the US. CNMOC is focused on providing critical environmental knowledge to the warfighting disciplines of Anti-Submarine Warfare; Naval Special Warfare; Mine Warfare; Intelligence, Surveillance and Reconnaissance; and Fleet Operations (Strike and Expeditionary), as well as to the support areas of Maritime Operations, Aviation Operations, Navigation, Precise Time, and Astrometry. The Oceanographer of the Navy works closely with the staff of CNMOC to ensure the proper resources are available to meet its mission, to act as a liaison between CNMOC and the Chief of Naval Operations, and to represent the Naval Oceanography Program in inter-agency and international forums.

Gainesville is a ghost town located in Hancock County, Mississippi. Formerly a thriving port on the Pearl River, the town experienced decline due to the emergence of railways in the mid-19th century. The land was acquired by NASA in 1962, later becoming home to the Stennis Space Center.

Napoleon is an unincorporated community located on the Pearl River in Hancock County, Mississippi, United States.A post office operated under the name Napoleon from 1847 to 1905. After the post office closed, mail was routed to the post office in Huxford.Napoleon was once home to a turpentine and camphine distillery.Much of the community was abandoned after the creation of the Stennis Space Center.

The Mississippi Army Ammunition Plant was a 13,480-acre (54.6 km2) government-owned, contractor-operated facility in Hancock County, Mississippi that was dedicated on March 31, 1983. Construction in the northern part of the John C. Stennis Space Center facility began on January 8, 1978. The plant was deactivated on March 4, 2009 as part of the Base Realignment and Closure, 2005. The plant was last operated by Mason Technologies, Inc., a subsidiary of Mason and Hanger-Silas Co., Inc.

Pearl River Wildlife Management Area, also known as Pearl River WMA, is a 35,619 acres (14,414 ha) tract of protected area near Slidell in St. Tammany Parish, Louisiana, in the United States. The WMA is managed by the Louisiana Department of Wildlife and Fisheries (LDWF)

Pearlington is a census-designated place (CDP) in Hancock County, Mississippi, United States, on U.S. Route 90, along the Pearl River, at the Louisiana state line. It is part of the Gulfport–Biloxi, Mississippi Metropolitan Statistical Area. The population was 1,684 at the 2000 census. On August 29, 2005, Hurricane Katrina made landfall just south of Pearlington.

The Haaswood Store, at 62011 Louisiana Highway 1091 in St. Tammany Parish, Louisiana, near Pearl River, Louisiana, was built in 1930. It was listed on the National Register of Historic Places in 2009.The store was in operation into the 1960s. The building is a one-and-one-half-story store at an intersection in the unincorporated community of Haaswood, Louisiana. It is built with wood frame and cast concrete blocks.

Pearl River is a town in St. Tammany Parish in the U.S. state of Louisiana. The population was 2,506 at the 2010 U.S. census, and 2,618 at the 2020 population estimates program. It is part of the New Orleans–Metairie–Kenner metropolitan statistical area.

White Kitchen is an unincorporated community in St. Tammany Parish, Louisiana, United States. The community is located at the intersection of U.S. Route 90 and U.S. Route 190 and approximately 7 miles (11 kilometres) southeast of Slidell. The West Pearl River flows past about one mile to the east and Pearlington, Mississippi is about five miles to the east.

The Honey Island Swamp (French: Marais de l'Île-de-Miel, Spanish: Pantano de Isla de la Miel) is a marshland located in the eastern portion of the U.S. state of Louisiana in St. Tammany Parish. Honey Island earned its name due to the abundance of honey bees once seen on a nearby isle. The swamp is bordered on the north by U.S. 11, on the south by Lake Borgne, on the east by the Pearl River and the west by the West Pearl River. The swamp is located within the Pearl River wildlife management area and managed by the Louisiana Department of Wildlife and Fisheries. It is one of the least-altered river swamps in the United States. Considered by many to be one of the most pristine swampland habitats in the United States, the Honey Island Swamp covers an area that is over 20 miles (30 km) long and nearly seven miles (10 km) across, with 35,619 of its 70,000 acres (280 km2) government sanctioned as permanently protected wildlife area.

Pearl River High School is a high school in Pearl River, Louisiana, United States, operated by the St. Tammany Parish School Board. In addition to Pearl River it serves a small section of Slidell.