Encyclopedia Dubuque
"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
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Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
563 AREA CODE
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563 AREA CODE. The twentieth-first century opened with the state utilities board announcing that Dubuque and much of northeast Iowa was being assigned a "563" area code to replace "310."
The change was forced because the supply of 319 numbers was expected to be exhausted by the end of 2001.
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Source:
"Introducing the 563 Area Code," Dubuque by the Decades, Telegraph Herald, July, 2020, p. 50