Build authentic trust
When you reach out to prospects in the Mount Rushmore State, nothing establishes credibility quite like a 605 area code.
Customers in Sioux Falls and Rapid City are far more likely to answer a call that looks familiar. By utilizing a recognizable prefix, you bypass the usual skepticism associated with out-of-state numbers and instantly position yourself as a trusted community member. This local familiarity lays the groundwork for stronger, long-lasting client relationships across the entire region.
Establish a statewide presence
Operating a business in South Dakota does not mean you have to be physically located near the Badlands or Aberdeen.
With a virtual number, you can project a dedicated local footprint from absolutely anywhere in the world. Whether your clients are working in agricultural hubs or bustling downtown districts, they will feel confident knowing they are dealing with a company that understands their specific market dynamics. You gain all the benefits of regional proximity without the costly overhead of leasing physical office space.
Unlock unmatched AI power
Adopting a modern phone system elevates your standard communication into a highly efficient sales machine.
Allo provides an intelligent AI receptionist that ensures no inquiry from a 605 number ever slips through the cracks. Every conversation is automatically transcribed and analyzed to generate instant call summaries that sync perfectly with your existing CRM. Your team can focus entirely on closing deals and providing exceptional service while the automated technology handles the tedious administrative tasks.
How does it work?
Create your Allo account
Go to the signup page and enter your details.We offer 7-day free trial to let you test your new number and all the options that come with it.
Select your phone number
Pick your state, city and area code. We then generate the virtual phone number based on your preferences
Adjust your settings
Once you’ve been assigned a number, you can start configuring your account (voicemail, business hours, etc.)



Supercharge your number with AI
Get your calls answered by our AI answering service when you’re busy, leverage our AI IVR to redirect your calls to the right person, receive a call transcript and summary when your calls finish, and more.
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Communicate without limits
Your phone number comes with unlimited calls and text messages to US numbers.

Stop spam
Your phone number comes with unlimited calls and text messages to US numbers.

Know who’s calling
Your phone number comes with unlimited calls and text messages to US numbers.



Frequently
Asked Questions
Where is the area code 605?
The 605 area code serves the entire state of South Dakota. This includes major cities like Sioux Falls, Rapid City, and Aberdeen, as well as all surrounding rural communities.
What's the timezone associated with the 605 area code?
South Dakota is split between two timezones. The eastern half of the state, including Sioux Falls, operates on Central Time, while the western half, including Rapid City, observes Mountain Time.
Do I need a physical address in Sioux Falls to purchase a phone number with a 605 prefix?
No, you do not need a physical address or local office in South Dakota. Allo allows you to securely purchase and manage a virtual 605 phone number from anywhere in the world.
Will people know where I'm actually calling from?
Not at all. When you place an outbound call using your Allo system, the recipient's caller ID will only display your localized 605 phone number, protecting your actual location.


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