Question: Area code 580 serves which city in and the county seat of Pontotoc County, Oklahoma, United States?
Context: Area code 561 is the telephone area code serving Palm Beach County, Florida, United States.  It was created on May 13, 1996 in a split from area code 407.  Notable cities within 561 are Palm Beach, West Palm Beach, Boca Raton, Wellington, Boynton Beach, Delray Beach, and Belle Glade. Area code 612 is part of the North American Numbering Plan (NANP) of the public switched telephone network for the city of Minneapolis, Minnesota and a few surrounding areas such as Fort Snelling, St. Anthony and Richfield.  By geographical area, it is the smallest area code in the state of Minnesota.  However, like every single metropolitan area code in the United States, the region used to be much larger, accounting for the entire Twin Cities region and a wide area surrounding it. Fittstown is an unincorporated community in Pontotoc County, Oklahoma, United States.  Fittstown is located on U.S. Route 377 11 mi south-southeast of Ada.  Fittstown has a post office with ZIP code 74842. Area code 305 is the area code for all of Miami, Florida, Miami-Dade County, and the part of Monroe County in the Florida Keys in the United States.  The mainland portion of Monroe County is served by area code 239.  The numbering plan area 305 was overlaid by area code 786 in 1998. Ada Municipal Airport (IATA: ADT, ICAO: KADH, FAA LID: ADH) is a public airport located two miles (3 km) north of the central business district of Ada, a city in Pontotoc County, Oklahoma, United States.  It is owned by the City of Ada, which is located in southeast Oklahoma, 88 mi southeast of Oklahoma City. Pontotoc County is in the south central part of Oklahoma.  As of the 2010 census, the population was 37,492.  Its county seat is Ada.  The county was created at statehood from part of the Chickasaw Nation in Indian Territory.  It was named for a historic Chickasaw tribal area in Mississippi.  According to the "Encyclopedia of Oklahoma History and Culture", Pontotoc is usually translated "cattail prairie" or "land of hanging grapes." Ada is a city in and the county seat of Pontotoc County, Oklahoma, United States.  The population was 16,810 at the 2010 census, an increase of 7.1 percent from 15,691 at the 2000 census.  The city was named for Ada Reed, the daughter of an early settler, and was incorporated in 1901.  Ada is home to East Central University, and is the headquarters of the Chickasaw Nation. 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. Pontotoc County is a county located in the U.S. state of Mississippi.  As of the 2010 census, the population was 29,957.  Its county seat is Pontotoc.  It was created on February 9, 1836 from lands ceded to the United States under the Chickasaw Cession.  Pontotoc is a Chickasaw word meaning "land of hanging grapes".  The original Natchez Trace and the current-day Natchez Trace Parkway both pass through the southeast corner of Pontotoc County. Johnson Tal Crawford was a district judge in Pontotoc County, Oklahoma, United States from 1936 to 1946.  He was appointed as member of Military Tribunal I by Harry S. Truman
Answer: Ada