Area Code 314

You can increase your connection rate up to 30% by dialing from a local number.

Local Presence by Tenfold gives you one-click access from your existing phone system to a local number in the US area code 314 and more than 200 others.

Reach out to customers in Saint Louis, Ladue, Kirkwood, Creve Coeur, Overland, and Ferguson.

Source: Wikipedia