South Dakota Area Codes
1 active area code · Sioux Falls · Population around 927,110
South Dakota has 1 active area code, serving cities like Sioux Falls, Rapid City, and Aberdeen. 605 has covered the whole of South Dakota since 1947. Each code below links to its cities, carriers, timezone, and coverage map.
South Dakota Area Code Map
What area codes does South Dakota have?
Every one of the 66 counties in South Dakota is covered by this code and no other.
How many phone prefixes does South Dakota use?
South Dakota's area code holds 734 assigned prefixes, listed under 88 distinct carrier names. A prefix is the three digits after the area code, and NANPA assigns each one to a single carrier.
Sources: City populations – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). State populations – the same program, Vintage 2025 (CO-EST2025-ALLDATA). Area-code footprint and county populations – 2020 Census Centers of Population, mapped against NANP area code boundaries. The share of each city inside a code is measured the same way, against Census place boundaries from the Census Bureau's TIGERweb service. Area code assignments – NANPA CO Code data. See our data methodology.
Frequently Asked Questions
How many area codes does South Dakota have?
South Dakota has 1 active area code: 605.
What is the main area code for South Dakota?
South Dakota has a single area code, 605, in service since 1947. It covers Sioux Falls, the largest city in South Dakota, and every county in South Dakota.
What are the largest cities in South Dakota?
The largest cities in South Dakota include Sioux Falls, Rapid City, Aberdeen, Brookings, Watertown.
What is the total population of South Dakota?
South Dakota has an estimated total population of 927,110 based on US Census PEP 2024 data.
What is the newest area code in South Dakota?
605, in service since 1947. It is the only area code in South Dakota.
Is my county covered by more than one area code in South Dakota?
No. All 66 counties in South Dakota are covered by 605, so no county here carries two.