641 is Iowa
604 is South DakotaWhat is the location of area codes 641 and 605?
Area code 605 is the telephone area code serving the entire state of South Dakota. This state is one of a handful that are single-state, single LATA, single area code areas.
Area code 641 is a telephone area code for a central portion of Iowa. The 641 area code was split off from Area code 515 in 2000. It includes Mason City.
The 641 area code was notable in that it marked the first time that a new area code had been created in Iowa since the establishment of the North American Numbering Plan in the 1940's.
...completely lifted from Wiki
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