Peoples Gas primarily serves areas within the states of Illinois and Pennsylvania. In Illinois, the service is concentrated in the city of Chicago and surrounding suburbs, providing natural gas to residents and businesses. In Pennsylvania, Peoples Gas serves communities in the western part of the state, including Pittsburgh and its vicinity. The coverage areas may vary, so it is advisable for individuals to consult the current web page for specific information about the regions served. Additionally, users can typically find detailed maps and accessibility information online, which can help identify whether Peoples Gas is available in a particular area. If someone is considering using their services, it is beneficial to verify the coverage through official resources to ensure accurate and up-to-date information.