Area Code 605 Phone Number
for Your Business
Get a local 605 number for your business in Sioux Falls, SD. Cloud VoIP with SMS, an auto attendant (IVR), and more — starting at $30/ext/mo. No contracts.
What Is Area Code 605?
Area code 605 is a North American telephone area code serving Sioux Falls, South Dakota. It is one of the original 1947 North American area codes and operates on Central & Mountain Time. Businesses operating in the 605 area code region use local numbers to build trust with customers, improve answer rates, and establish a professional local presence.
With Zonitel, you can get a new 605 area code number or port your existing one with guided onboarding — no hardware required. Your team can make and receive calls from any device using the Zonitel mobile app or web portal.
Area Code 605 at a Glance
- Region
- Statewide, South Dakota
- In service
- One of the original 1947 North American area codes
- Time zone
- Central & Mountain Time
- Overlay
- None — the only area code for its territory
- Telemarketing hours
- 8 a.m.–9 p.m. in the called party's local time for residential numbers (TCPA, 47 CFR 64.1200(c)(1))
Why Your Business Needs a 605 Local Number
A local number tells customers you're part of the community. People in Sioux Falls are more likely to pick up a call from a 605 number they recognize than from an unfamiliar out-of-area number.
Everything Included With Your 605 Number
Zonitel is not just a phone number — it's a complete cloud business phone system. Every plan includes:
Frequently Asked Questions About Area Code 605
What cities use area code 605?
Area code 605 serves the Statewide area of South Dakota. Cities in the 605 region include Sioux Falls, SD.
Is area code 605 an overlay?
No. 605 is not part of an overlay; it is the only area code serving its territory.
What time zone is area code 605 in?
Area code 605 is in Central & Mountain Time. Telemarketing calls to residential 605 numbers are limited to 8 a.m.–9 p.m. in the called party's local time under the TCPA (47 CFR 64.1200(c)(1)).
Can I get a 605 number for my business without moving there?
Yes. With Zonitel's cloud VoIP, you can get a 605 area code number regardless of where your business is physically located. This lets you establish a local presence in Sioux Falls without a physical office.
Can I keep my existing 605 number and switch to Zonitel?
Yes. Number porting is free. Porting commonly takes 5–10 business days depending on your current carrier, and your old service stays active until the coordinated cutover.
How much does a 605 business phone number cost?
Zonitel plans start at $30/extension/month plus tax, with no setup fees and no contracts. Your 605 local number is included in the plan.
Get Your 605 Area Code Number Today
30-day free trial. No annual contract required. Guided onboarding.