Nicor has been a part of the fabric of the communities in northern Illinois and the Chicago suburbs for five decades. The corporation's largest subsidiary, Nicor Gas, was founded in 1954 as Northern Illinois Gas and today is one of the largest natural gas distribution companies in the country, serving more than two million customers in 643 communities. Nicor Gas operates a network of more than 34,000 miles of pipelines, connected to the largest underground storage facilities in the country. Nicor's second largest subsidiary is Tropical Shipping, a containerized shipping business serving the Bahamas and Caribbean regions. Nicor also owns and has equity interest in several unregulated energy-related businesses including: Nicor Services, Nicor Advanced Energy, Nicor Solutions and Nicor Enerchange. Please try to contact Nicor Customer Service directly prior to posting any complaints on this site.