BHP Billiton Petroleum offers a range of services to the oil and gas industry in the United States. It staffs more than 1,500 employees and has operations in Houston in Texas. The company operates through exploration, development, production and marketing divisions. BHP Billiton Petroleum also maintains international locations in the United Kingdom, Pakistan and Singapore. The company is a part of BHP Billiton, which operates through several units. It manages BHP Billiton Iron Ore, which has operations in western Australia and Brazil. BHP Billiton also handles BHP Billiton Metallurgical Coal and BHP Billiton Manganese.