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Phone Directory 605-664 Detail

State Major City Time Zone
South Dakota Sioux Falls Central / Mountain

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Example: (605) 664-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
605-664 Yankton, SD Knology Of The Plains Yankton Landline 10/11/1997

Other Series For Prefixes

605-6640###
605-6641###
605-6642###
605-6643###
605-6644###
605-6645###
605-6646###
605-6647###
605-6648###
605-6649###