(Eaton, OH)--A new area code is coming to the Whitewater Valley. The 937 area code has covered nearly all of Preble and Darke since the mid-1990’s. But all available numbers beginning with that area code will be taken by the end of the year. That’s forced the Public Utilities Commission to add a new area code – 326. Beginning March 9, 326 will be intermingled with the 937 area code. If your phone number begins with 937, it won’t change. But, beginning February 8, all local calls inside the 937 area code will have to include all ten digits –even if that call is just going across the street.