EarthLink has coverage available in 37 states nationwide.
EarthLink Availability Map
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As you can see in the map on this page, EarthLink offers coverage in Alabama, Arkansas, Arizona, California, Connecticut, District of Columbia, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Michigan, Minnesota, Missouri, Mississippi, North Carolina, New Jersey, Nevada, New York, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas, Virginia, Washington, Wisconsin and West Virginia.
That said, if you are looking to setup EarthLink service, make sure to check and make sure their service is available in your zip code by searching below.