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605 Area Code

Area code 605 serves Sioux Falls, Rapid City, Aberdeen, Brookings, Watertown and nearby communities in South Dakota. It has been in service since January 1, 1947.

StateSouth Dakota
Time zonesCentral / Mountain
Local time now…
Prefixes in use745
Projected to run out2034
Sioux FallsRapid CityAberdeenBrookingsWatertownYanktonMitchellHuronSpearfishBox ElderPierreVermillionBrandonHarrisburgTeaRapid ValleySturgisMadisonBelle FourcheSioux FallsRapid CityAberdeenBrookingsWatertownYankton
Cities and towns served by area code 605

Who issues 605 numbers

Mobile 25%VoIP and cable 7%Landline 68%

Share of the 745 prefixes (the three digits after 605) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
Lumen (Qwest)104
Verizon Wireless100
AT&T Mobility81
Midcontinent Communications.34
Bluepeak32
Venture Communications Cooperative30
Interstate Telecom Coop28
Golden West Telecomm27

Cities and towns in area code 605

CityPopulationOther area codes
Sioux Falls213,748
Rapid City80,589
Aberdeen27,961
Brookings25,355
Watertown23,736
Yankton15,816
Mitchell15,756
Huron14,607
Spearfish14,154
Box Elder13,936
Pierre13,848
Vermillion11,720
Brandon11,306
Harrisburg10,405
Tea8,019
Rapid Valley7,153
Sturgis6,922
Madison6,065
Belle Fourche5,791

Got a call from 605?

A 605 number was originally issued in South Dakota, but that does not prove the caller is there. 7% of 605 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 745 prefixes in area code 605

Format: (605) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 605

Where is area code 605?
Area code 605 is in South Dakota. It covers Sioux Falls, Rapid City, Aberdeen, Brookings, Watertown, Yankton and 13 more cities and towns.
What time zone is area code 605?
Area code 605 spans two time zones: Central and Mountain. Check the caller's city before you call back.
Is 605 a toll-free number?
No. 605 is a geographic area code in South Dakota. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Will area code 605 run out of numbers?
NANPA's latest forecast projects area code 605 to exhaust in the third quarter of 2034. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in South Dakota