Treasury Division
The economy of Houston is based primarily on the energy industry, particularly oil. However, health care, biomedical research, and aerospace also constitute large sectors. The Houston metropolitan area comprises the largest concentration of petrochemical manufacturing in the world, including for synthetic rubber, insecticides, and fertilizers. It is the world's leading center for oilfield equipment construction, with the city of Houston home to more than 3,000 energy-related businesses, including many of the top oil and gas exploration and production firms and petroleum pipeline operators. (source: https://en.wikipedia.org/wiki/Economy_of_Houston)
-- Source: Greater Houston Partnership
