ST. LOUIS — A new area code, 557, has been activated in the St. Louis area for new customers. The St. Louis area has been home to the 314 area code and now has a second one added to the list.

Cancel anytime. ST. LOUIS — St. Louis’ monogamous run with the 314 area code is coming to an end, Missouri officials announced Tuesday. Soon, the city and suburbs that share those digits ...