H & P Drilling 405-677-8882
The other three area codes serving Oklahoma are 539 and 918, which cover northeastern Oklahoma (including the city of Tulsa); and 580, which serves western and southern Oklahoma.
Area code 405 was one of the original area codes put into service in 1947. Until January 1, 1953, it covered the entire state of Oklahoma. On that date, northeastern Oklahoma was assigned area code 918. On November 1, 1997, 405 was reduced to cover only central Oklahoma, while the southern and western portions of the old 405 became area code 580. As a result, 405 is the only area code in the state that does not reach the state's borders with Arkansas and Kansas.
Oklahoma County - Population 718,633
Seminole County - Population 422,718
Canadian County - Population 115,541
Payne County - Population 77,350
McClain County - Population 34,506
Caddo County - Population 29,600