Area code 641 is a telephonearea code in theNorth American Numbering Plan (NANP) for the central region of theU.S. state ofIowa. The numbering plan area (NPA) includesMarshalltown,Mason City, andOttumwa. The area code was created in asplit ofarea code 515 on July 9, 2000, which was the first split in Iowa since the establishment of the area code system in 1947.
In 2006, various companies began using Iowa's 641 as a number to accessvoice over IP gateways, including one which purported to allow users to "call China for free".[1] The scheme, no longer in operation, was based on the wholesale cost of calls to rural Iowa being substantially more than the cost of Internet calls toChina.
| North:507/924 | ||
| West:515,712 | area code 641 | East:319,563 |
| South:660 | ||
| Minnesota area codes:218,320,507/924,612,651,763,952 | ||
| Missouri area codes:314/557,417,573/235,636,660,816/975 | ||