Using our Gazetteer, we found that there are two Illinois communities named Stone: This one is located in Hardin County and the other is located in Lee County.
Beyond Illinois, there are 19 communities that are also named Stone - they are located in Alabama, Arkansas, British Columbia, California, Georgia, Idaho, Indiana, Kansas, Kentucky (2), Michigan, Montana, Ohio, Oklahoma, South Carolina, Tennessee, Washington and Wisconsin.
If you're interested in how the shape of Illinois' counties, including Hardin, have changed over time, we recommend the Atlas of Historical County Boundaries.
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When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 618 code has been Overlayed with the 730 area code. New phone numbers in the Stone area will be assigned with one of these codes: 618 or 730. As a result, placing a call in the Stone area will require 10-digit dialing (where you enter both the area code and then the phone number).