Largest Chemical Plants in the US: Top 10 Facilities in 2025
The United States is home to some of the largest chemical manufacturing facilities in the world, many of them concentrated along the Gulf Coast of Texas and Louisiana. The largest chemical plants in the US by production capacity and output are dominated by sites in Texas, including the massive ExxonMobil Baytown Complex and the Dow Chemical Freeport site. These facilities process raw materials like natural gas liquids, crude oil, and salt into polymers, plastics, industrial gases, and specialty chemicals that supply downstream industries from construction to electronics.
The Gulf Coast Chemical Corridor
The majority of the largest chemical plants in the US sit within a 200-mile stretch of the Texas and Louisiana Gulf Coast. This region offers direct access to natural gas and natural gas liquids from the Permian Basin and Eagle Ford shale plays, deepwater ports for shipping products overseas, and a large petrochemical workforce. The U.S. Energy Information Administration notes that the industrial sector along the Gulf Coast consumes roughly one-third of all natural gas used in the country, much of it as feedstock for chemical production U.S. Energy Information Administration.
ExxonMobil Baytown Complex (Texas)
The ExxonMobil Baytown Complex, located about 25 miles east of Houston, is one of the largest integrated petrochemical and refining sites in the world. It includes a refinery, a chemical plant, an olefins plant, and a plastics plant. The complex produces ethylene, propylene, polyethylene, and other basic chemicals. Baytown has a crude oil refining capacity of over 560,000 barrels per day, and its chemical operations feed into downstream plastics manufacturing that supplies packaging, automotive parts, and medical supplies.
ExxonMobil has invested billions of dollars in the Baytown site over the past decade, including expansions to its ethylene cracker capacity and a new chemical recycling facility. The site employs thousands of workers and covers roughly 3,400 acres.
Dow Chemical Freeport Site (Texas)
Dow’s Freeport site, located on the Texas Gulf Coast near the Brazos River, is the company’s largest integrated manufacturing complex in the world. The site produces a wide range of chemicals including ethylene, propylene, chlorine, caustic soda, and polyethylene. Freeport also hosts Dow’s largest ethylene cracker, which uses ethane from natural gas as its primary feedstock.
The Freeport site is also home to Dow’s “Happiness Factory” — a packaging and specialty plastics division that produces materials for food packaging, pharmaceuticals, and industrial applications. The site spans about 5,000 acres and includes more than 50 individual production units. Dow has invested heavily in on-site power generation and cogeneration facilities to reduce energy costs and emissions.
Shintech PVC Plants (Louisiana and Texas)
Shintech, a U.S. subsidiary of Japan’s Shin-Etsu Chemical, operates the largest polyvinyl chloride (PVC) production facilities in the country. The company’s plants in Freeport, Texas, and Addis, Louisiana (near Baton Rouge) produce PVC resin, vinyl chloride monomer (VCM), and chlorine. Shintech’s Freeport plant began operations in 1976, and the Addis plant was built in phases starting in 2000 Wikipedia — Shin-Etsu Chemical.
Shintech is the largest PVC producer in the world, and its U.S. plants supply construction materials (pipes, siding, window frames), medical tubing, and electrical insulation. The company has expanded its Louisiana site multiple times, adding new VCM and PVC capacity to meet growing demand from the building and construction sector.
BASF Geismar Site (Louisiana)
BASF’s Geismar site, located on the Mississippi River between Baton Rouge and New Orleans, is one of the company’s largest chemical production hubs in North America. The site produces MDI (methylene diphenyl diisocyanate), TDI (toluene diisocyanate), polyurethane precursors, and a range of industrial chemicals used in insulation, coatings, adhesives, and automotive parts.
Geismar also produces caprolactam, a precursor to nylon, and ammonia for agricultural fertilizers. The site covers roughly 1,500 acres and employs around 2,000 people. BASF has invested over $1 billion in the Geismar site in recent years, including a new MDI expansion and upgrades to energy efficiency and emissions controls.
LyondellBasell Houston Refinery and Petrochemical Complex (Texas)
LyondellBasell operates a large integrated refinery and petrochemical complex in Houston, Texas, which includes a refinery, an olefins plant, and a polypropylene plant. The site produces ethylene, propylene, polypropylene, and other basic chemicals. The Houston complex is one of the largest polypropylene production sites in the world, supplying the automotive, packaging, and consumer goods industries.
The site also includes a methanol plant and a MTBE (methyl tert-butyl ether) unit. LyondellBasell has invested in expanding its propylene oxide and tertiary butyl alcohol capacity at the Houston site, which is used in the production of foam insulation, coatings, and cleaning products.
Chevron Phillips Chemical Cedar Bayou (Texas)
Chevron Phillips Chemical’s Cedar Bayou plant, located in Baytown, Texas, is one of the largest ethylene production sites in the United States. The plant produces ethylene, propylene, and other olefins that are used as building blocks for plastics, synthetic rubber, and solvents. Cedar Bayou also has a large alpha-olefins unit that produces linear alpha-olefins used in detergents, lubricants, and plasticizers.
The site is part of a larger Chevron Phillips Chemical complex that includes a research and technology center. The company has invested in expanding its ethylene capacity at Cedar Bayou to meet growing demand from the polyethylene market.
OxyChem (Occidental Chemical) Ingleside (Texas)
OxyChem’s Ingleside plant, located near Corpus Christi, Texas, is one of the largest chlor-alkali production sites in the United States. The plant produces chlorine, caustic soda, and other chlorinated chemicals used in water treatment, pulp and paper production, and the manufacture of PVC and other plastics. The Ingleside site also includes a large ethylene dichloride (EDC) unit that supplies the PVC industry.
OxyChem has invested in modernizing the Ingleside plant to improve energy efficiency and reduce mercury emissions, as the site historically used mercury-cell technology. The plant now uses membrane-cell technology, which is more energy-efficient and environmentally friendly.
Eastman Chemical Kingsport (Tennessee)
Eastman Chemical’s Kingsport site, located in northeastern Tennessee, is the company’s largest manufacturing complex and one of the largest chemical plants in the US outside the Gulf Coast. The site produces a wide range of chemicals including cellulose acetate, copolyesters, plasticizers, and specialty chemicals used in cigarette filters, textiles, packaging, and automotive components.
The Kingsport site covers roughly 2,000 acres and includes a large research and development center. Eastman has invested in a new chemical recycling facility at the Kingsport site that uses methanolysis to break down waste plastics into their chemical building blocks.
Key Takeaways
- The largest chemical plants in the US are concentrated along the Gulf Coast of Texas and Louisiana, with major sites in Baytown, Freeport, Geismar, and Houston.
- The ExxonMobil Baytown Complex and Dow Chemical Freeport site are the largest integrated petrochemical and chemical manufacturing sites in the country.
- Shintech (a subsidiary of Shin-Etsu Chemical) operates the largest PVC production facilities in the US at its Freeport, Texas, and Addis, Louisiana, plants.
- Natural gas and natural gas liquids from domestic shale plays provide the primary feedstock for most of these facilities, giving US producers a cost advantage over many global competitors.
- Several of these sites have undergone major expansions in the past decade, driven by demand for plastics, packaging, and construction materials.
