Area Codes United States of America The Area Codes of United States of America: City/Town or Region Area code 1.Ohio6142.Ohio5673.Ohio5134.Ohio3805.Ohio3306.Ohio9377.Ohio7408.Ohio2349.Ohio22010.Ohio21611.Ohio44012.Ohio41913.Oklahoma40514.Oklahoma53915.Oklahoma58016.Oklahoma91817.Oregon54118.Oregon97119.Oregon50320.Oregon458