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South Dakota Area Codes

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State: South Dakota (SD)
Area Codes: 1
Timezone: Central (CDT)
Current Time: 8:47 PM

About South Dakota Area Codes

South Dakota (SD) uses 1 telephone area code to serve its residents and businesses. With an estimated population of 698,307, South Dakota is one of the smaller states in the North American Numbering Plan (NANP). The state is primarily in the Central Time Zone (CDT). The current local time in South Dakota is 8:47 PM.

The largest cities in South Dakota include Sioux Falls (pop. 187,239), Rapid City (pop. 92,664), Aberdeen (pop. 28,257), Brookings (pop. 24,887) and Watertown (pop. 22,174) . South Dakota has 66 counties spread across its territory. Each area code in SD covers a geographic region of the state, with some areas using overlay codes that share the same geographic territory as an existing area code.

When calling a South Dakota phone number from outside the area code, you must dial the full 10-digit number: the 3-digit area code followed by the 7-digit local number. Many parts of South Dakota now require 10-digit dialing even for local calls due to overlay area codes and the nationwide 988 Suicide & Crisis Lifeline implementation.

All South Dakota Area Codes

The table below lists every active area code in South Dakota, along with the major city served and other cities covered by each code.

Area Code Major City Other Cities
605 Sioux Falls Rapid City, Aberdeen, Brookings, Watertown, Mitchell, Yankton, Pierre, Huron and more

Largest Cities in South Dakota

These are the largest cities in South Dakota by population, along with their primary area codes and counties.

City Population County
Sioux Falls 187,239 Minnehaha County
Rapid City 92,664 Pennington County
Aberdeen 28,257 Brown County
Brookings 24,887 Brookings County
Watertown 22,174 Codington County
Mitchell 15,679 Davison County
Yankton 14,872 Yankton County
Pierre 14,659 Hughes County
Huron 13,427 Beadle County
Spearfish 12,836 Lawrence County

Frequently Asked Questions

South Dakota has 1 active area code. These include 605 (Sioux Falls) .

South Dakota is primarily in the Central Time Zone (CDT). The current local time is 8:47 PM.

The area code covering the most cities in South Dakota is 605, which serves Sioux Falls and 125+ other communities.

Yes, most areas in South Dakota now require 10-digit dialing (area code + 7-digit number) for all local calls. This requirement was implemented across the United States starting in October 2021 to support the 988 Suicide & Crisis Lifeline. Even if you are calling within the same area code, you need to dial all 10 digits.

To call a South Dakota number from within the United States, dial the area code followed by the 7-digit phone number (e.g., 605-XXX-XXXX). From outside the US, dial your country's exit code, then 1 (the US country code), then the full 10-digit number.

South Dakota has 66 counties. The state's total estimated population is 698,307, spread across these counties and served by 1 area code.

Sioux Falls is served by area code 605 .
South Dakota at a Glance
  • Abbreviation SD
  • Area Codes 1
  • Population 698,307
  • Counties 66
  • Cities 382
  • Time Zone Central
  • Current Time 8:47 PM
Quick Reference
  • 605 Sioux Falls