Unitil's service territory for natural gas includes these communities:

Auburn, Biddeford, Cape Elizabeth, Cumberland, Eliot, Gorham, Kennebunk, Kittery, Lewiston, Lisbon, Lisbon Falls, New Gloucester, North Berwick, Old Orchard Beach, Portland, Saco, Sanford, Scarborough, South Berwick, South Portland, Wells, Westbrook and York.