ONG (Oklahoma Natural Gas) Company is among the leading natural gas providers in America. The company is centered in Tulsa, Oklahoma and had changed its title to ONEOK in December 1980. ONG provides services to about 2000000 customers by means of its distribution companies such as Kansas Gas Service. The company also operates leading natural gas liquids systems, because the company purchased Koch Industries in 2005. Its Energy Services functions mainly concentrate on promoting the natural gas and associated services across the United States. The postal and official address, email address and phone number (helpline) of ong service center is given below. The helpline of ong service center may or may not be toll free.