. zip code need help help with zip codes to provide you with the best experience possible and ensure we are presenting the correct information to you our website requires customers enter a zip code for their service address . example zip codes from across our service territory are provided below . you can also visit the u.s. postal service s website to look up a specific zip code . connecticut electric & gas 06901 connecticut electric only 06101 connecticut gas only 06859 new hampshire electric 03101 eastern massachusetts electric & gas 02090 eastern massachusetts electric only 02115 eastern massachusetts gas only 01603 western massachusetts electric 01101 skip back to zip code entry close select your region below to provide you with the best experience about our services . new hampshire eastern massachusetts western massachusetts connecticut new hampshire eastern massachusetts western massachusetts connecticut or select your service region in the menu below . please select a service 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territory are provided below . you can also visit the u.s. postal service s website to look up a specific zip code . connecticut electric & gas 06901 connecticut electric only 06101 connecticut gas only 06859 new hampshire electric 03101 eastern massachusetts electric & gas 02090 eastern massachusetts electric only 02115 eastern massachusetts gas only 01603 western massachusetts electric 01101 back to zip code entry cancel