Sioux Falls, South Dakota
Area code 605 phone validation
Calling or texting a list of 605 numbers? Check every number first: valid or dead, mobile, landline or VoIP, and the carrier it is on now.
Start 7-day free trial →Eastern South Dakota (Sioux Falls, Pierre) is Central; western South Dakota (Rapid City) is Mountain.
What validating 605 numbers tells you
- ✓Valid or dead. Disconnected and unassigned 605 numbers are flagged before your dialer or SMS tool reaches them.
- ✓Mobile, landline or VoIP. Know which numbers can take a text and which are desk phones or app numbers.
- ✓Carrier. The carrier each number is on now, which can differ from the company that was first given the prefix because numbers are ported.
Who holds 605 prefixes
Companies holding the most 605 prefixes (NPA-NXX blocks) in the NANPA utilized-codes report. This is who was assigned the number blocks, not who serves each number today: a number can be ported to any carrier, which is why a live check matters.
| Qwest | 104 prefixes |
| Verizon Wireless | 100 prefixes |
| New Cingular Wireless Pcs | 81 prefixes |
| Midcontinent Communications. | 34 prefixes |
| Bluepeak | 32 prefixes |
| Venture Communications Cooperative | 30 prefixes |
56 of 745 605 prefixes are held by companies that commonly supply numbers to VoIP and texting apps.
Places served by 605
Sioux Fls, Rapid City, Aberdeen, Spearfish, Watertown, Pierre, Huron, Yankton.
Upload your 605 list as CSV or Excel. Every number comes back marked valid or dead, mobile, landline or VoIP, with carrier.
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Questions
Where is area code 605?
605 serves Sioux Falls, South Dakota, including places such as Rapid City, Aberdeen, Spearfish. Time zone: Central Time (CT).
Does a 605 number mean the person is in South Dakota?
Not always. People keep their numbers when they move or switch carriers, and VoIP numbers can be assigned anywhere. The area code tells you where the number was first assigned, not where the person is today.
What does validating a 605 number tell me?
Whether the number is valid or dead, whether it is a mobile, landline or VoIP line, and the carrier it is on now, from live carrier data.
Does TrueSearch check Do Not Call lists?
No. TrueSearch does not check the National Do Not Call Registry, state DNC lists or litigator lists yet. Run those checks separately where they apply.
605 prefix pages
Area code 605 reference: places, prefixes and local time
This guide is general information, not legal advice. TrueSearch for Business checks validity, line type and carrier from licensed telecom data. It does not check the National Do Not Call Registry, state DNC lists or the FCC Reassigned Numbers Database. Not a consumer reporting agency; not for FCRA purposes.