Area code 309 is an area code that is part of Illinois. It was created as a split from 815 in 1957. It covers towns such as Bloomington, Rock Island, Galesburg, East Moline, East Peoria, Canton, and Morton. It was overlaid by 861 on February 24, 2023.[1][2]

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  1. ↑ https://www2.illinois.gov/IISNews/24203-ICC_Announces_New_861_Area_Code_for_309_Region.pdf
  2. ↑ https://www.nationalnanpa.com/planning_letters/PL_577.pdf
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