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None of the Iowa codes are expected to need relief in the immediate future.
- 319: Cedar Rapids, Waterloo, Iowa City, and Cedar Falls (original area code created in 1947)
- 515: Des Moines, Ames, West Des Moines, Urbandale and Fort Dodge (original area code created in 1947)
- 563: Davenport, Dubuque, Bettendorf, Clinton, Muscatine (split from 319 in 2001)
- 641: Mason City, Marshalltown, Ottumwa, Tama (split from 515 in 1997)
- 712: Sioux City, Council Bluffs (original area code created in 1947)