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Phone Directory 605-666 Detail

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

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Example: (605) 666-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
605-666 Keystone, SD Fort Randall Telco DBA Mt Rushmore Telephone Co Pennington Landline 02/04/1994

Other Series For Prefixes

605-6660###
605-6661###
605-6662###
605-6663###
605-6664###
605-6665###
605-6666###
605-6667###
605-6668###
605-6669###