605 Area Code — South Dakota
605 is a North American Numbering Plan area code for South Dakota, the United States. It covers about 905,421 people in 354 towns and 376 ZIP codes, including Sioux Falls, Rapid City and Aberdeen.
| Field | Value |
|---|---|
| Area code | 605 |
| Country | United States (+1) |
| State / province | South Dakota |
| Type | Standalone (no other NANP code covers the same towns) |
| Time zone | Central and Mountain |
| Population covered | 905,421 |
| Towns covered | 354 |
| ZIP codes | 376 |
| Approx. centre | 44.283, -99.042 |
Where area code 605 is used
Area code 605 is assigned to South Dakota, the United States, inside the North American Numbering Plan. Numbers in the code are written (605) NXX-XXXX at home and +1 605 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Towns and cities in area code 605
The 354 towns below are the largest in the 605 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Sioux Falls | Minnehaha County | 208,064 | 15 |
| Rapid City | Pennington County | 99,403 | 4 |
| Aberdeen | Brown County | 31,939 | 2 |
| Watertown | Codington County | 26,781 | 1 |
| Brookings | Brookings County | 26,569 | 2 |
| Yankton | Yankton County | 20,383 | 1 |
| Mitchell | Davison County | 19,104 | 1 |
| Spearfish | Lawrence County | 17,816 | 2 |
| Pierre | Hughes County | 17,326 | 1 |
| Huron | Beadle County | 16,199 | 2 |
| Vermillion | Clay County | 13,091 | 1 |
| Brandon | Minnehaha County | 12,290 | 1 |
Counties covered
| County | ZIP codes |
|---|---|
| Minnehaha County | 25 |
| Brown County | 15 |
| Meade County | 13 |
| Grant County | 10 |
| Spink County | 10 |
| Corson County | 10 |
| Lincoln County | 9 |
| Beadle County | 9 |
| Pennington County | 9 |
| Brookings County | 8 |
| Turner County | 7 |
| Lake County | 7 |
Nearby area codes
How to dial area code 605
- Within North America: 605 + 7-digit number (605-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 605, then the 7-digit number — for example 00 1 605 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 605?
605 is a North American Numbering Plan area code assigned to South Dakota, the United States. It covers about 905,421 people in 354 towns.
Is 605 a US or Canadian area code?
605 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 605 in?
Area code 605 is in the Central and Mountain time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.