How many area codes does South Dakota have?

South Dakota has 1 active geographic area code in the North American Numbering Plan: 605. Each code serves a distinct region or acts as an overlay for a high-demand metro area.

What is the oldest area code in South Dakota?

The oldest area code in South Dakota is 605, assigned in 1947. It serves Sioux Falls and the South Dakota (statewide) region. 605 is one of the original 86 area codes created when the North American Numbering Plan was first established.

Can I get a South Dakota phone number from anywhere?

Yes. DialPhone virtual phone numbers are not tied to a physical location. You can get a South Dakota area code number and use it from any device — desktop, mobile, or browser — anywhere with an internet connection. This makes South Dakota numbers ideal for remote teams, distributed businesses, and sales teams targeting South Dakota customers.

How much does a South Dakota area code number cost?

DialPhone plans start at $24 per user per month on the Core plan. Every plan includes your choice of South Dakota area code number, unlimited US and Canada calling, business SMS, AI call captions, and a free 14-day trial — no credit card required. See the DialPhone pricing page for current tier details.

Can I port my existing South Dakota number to DialPhone?

Yes. DialPhone supports free number porting from any major US or Canadian carrier, including existing South Dakota area code numbers. Porting typically completes in 2 to 5 business days with zero service interruption. See the complete number porting guide for step-by-step instructions.

What time zones are used in South Dakota?

South Dakota area codes span the CT time zone. When scheduling calls with South Dakota customers, verify the specific area code's time zone to avoid calling outside business hours.

Area Codes in South Dakota — Local Business Phone Numbers

Quick answer

South Dakota has 1 active geographic area code covering Sioux Falls. The most-recognized code is 605, serving Sioux Falls and the South Dakota (statewide) region.

Total codes: 1
Top metro: Sioux Falls
Time zone: CT
Largest code: 605 (Sioux Falls)

By Darshan M

Growth Operations Lead at DialPhone · Verified against NANPA data

Area codes in South Dakota

South Dakota is served by 1 active geographic area code in the North American Numbering Plan. The 605 area code covers the entire South Dakota (statewide) region.

Code	Primary City	Region	Established	Overlay Codes	Population
605	Sioux Falls	South Dakota (statewide)	1947	—	900,000

Time zones in South Dakota

All area codes in South Dakota fall in the CT time zone.

CT — area code: 605

Top metros and their area codes

Below are the primary cities in South Dakota and the area codes that serve each metro. Cities with multiple codes share geography due to overlay assignments added as demand grew.

Sioux Falls — 605

Why get a local South Dakota number?

A South Dakota area code number gives your business three core advantages:

Local trust signal. Customers in South Dakota recognize local area codes as their own. A familiar caller ID builds immediate credibility for service businesses, sales teams, and patient communication.
Higher answer rate. Calls from a local area code are answered far more often than toll-free or out-of-area numbers — industry data puts the lift at 20–40%. That difference matters most for outbound sales, appointment confirmations, and service callbacks.
Targeted marketing. Advertising a local South Dakota number on print, radio, digital, and outdoor channels converts better than a national 800 number for audiences who prefer doing business locally.

How to get a South Dakota area code number with DialPhone

Setting up a South Dakota business number takes under 10 minutes:

Sign up for a DialPhone plan. Choose any plan starting at $24/user/month. Free 14-day trial, no credit card required.
Search available South Dakota numbers. Filter the DialPhone number inventory by state, area code, city, or number pattern.
Choose your number and configure. Assign your new South Dakota number to a user or team, configure call routing, voicemail, AI receptionist, and business SMS.
Port your existing number (optional). Already have a South Dakota number? Free number porting completes in 2 to 5 business days with zero service interruption.