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Informs of new telephone area code affecting certain regions of MO,effective 960708.Map showing affected regions encl.
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Area code 636 - Wikipedia
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Area codes 314 and 557 - Wikipedia
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Parts of Northeast Missouri to receive new area code | KHQA
Missouri to get new area code, 557 will join 314 in eastern part of state | KRCG
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New area code number announced for the 573 area code region – Sun Times News Online
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