How is a rate center different from a city?
A telephone rate center is an industry location label. Some names are abbreviated or cover several communities, so this search is useful for finding related area codes but is not a complete city coverage map. A number’s prefix does not establish where its owner lives or where a call originated.
Source: NANPA US Central Office Code Assignment Records, updated 2026-09-29. For Canadian exchange areas, use the Canadian Numbering Administrator.