Nicor Gas serves more than 1.9 million customers living and working in 640 northern Illinois communities.

Nicor Gas serves customers in the northern third of Illinois, excluding the city of Chicago. Since our formation in 1954, we have grown to become the largest natural gas distribution company in Illinois and one of the largest in the nation. We also transport and store natural gas for nearly 129,000 commercial, industrial and residential customers who purchase their own gas supplies.

Our corporate office is in Naperville, and we have regional offices located throughout our service territory to meet your needs.