Area Codes Phone Directory 605-721

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

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Example: (605) 721-5555 or 2012145555

Prefix	Primary City	Company	County	Usage	Introduced
605-721	Rapid City, SD	Knology Of The Black Hills	Pennington	Landline	07/22/1999

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