Question: Area code 580 serves which city in and the county seat of Pontotoc County, Oklahoma, United States?
Sentence (from "Area code 580"): Area code 580 serves the state of Oklahoma, serving places away from the Oklahoma City or Tulsa areas, including: Ada, Boise City, Lawton, Enid, Ponca City, Altus, Frederick, Weatherford, Guymon, Durant, and Ardmore.
Relevant evidence: Yes