605 Area CodeSioux Falls, SD
Area code 605 covers Sioux Falls and nearby communities in South Dakota, home to about 714,000 people across 390 cities. It's the only area code for this region, so the three digits alone place the caller.
Overview
- Major City
- Sioux Falls
- State
- South Dakota (SD)
- Timezone
- Central / Mountain
- Current Time
- Overlay
- No – unique area code
Where is area code 605?
Area code 605 serves part of Sioux Falls, SD and the surrounding areas. It is a unique area code with no overlays.
Overview of the 605 Area Code
What is the 605 area code?
The 605 area code serves Sioux Falls, South Dakota. When you see a 605 number, it indicates a local number within this geographic area.
Why was area code 605 created?
The 605 area code was established to serve the Sioux Falls region in South Dakota. It provides telephone number coverage across 390 cities.
Geographic Coverage of the 605 Area Code
The 605 area code serves Sioux Falls and surrounding areas in South Dakota. It operates within the Central / Mountain time zone. This area code covers several key cities, including:
- Sioux Falls
- Rapid City
- Aberdeen
- Brookings
- Watertown
- Yankton
Got a call from a 605 number? It came from Sioux Falls, SD. No other area code overlaps the 605 territory, so the prefix alone identifies where the caller is. Inside 605, Sioux Falls holds about 29% of the population; the rest is split across 389 smaller cities.
Sioux Falls Area Code Overview
The 605 area code provides comprehensive telephone coverage for Sioux Falls and its surrounding communities. As the sole area code for this region, it uniquely identifies all local numbers within the service area.
What cities does area code 605 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| Sioux Falls | SD | 209,289 | 0% | 100% |
| Rapid City | SD | 79,894 | 0% | 100% |
| Aberdeen | SD | 27,919 | 0% | 100% |
| Brookings | SD | 24,555 | 0% | 100% |
| Watertown | SD | 23,492 | 0% | 100% |
| Yankton | SD | 15,670 | 0% | 100% |
| Mitchell | SD | 15,621 | 0% | 100% |
| Huron | SD | 14,515 | 0% | 100% |
| Box Elder | SD | 13,887 | 0% | 100% |
| Spearfish | SD | 13,803 | 0% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 605 been reported for unwanted calls?
Yes – 357 unwanted-call complaints were reported to the FTC for numbers showing a 605 area code (May 29 – Jul 2, 2026).
- 80% robocalls
- ↓ 8% vs prior period
Most-reported subjects
- Reducing your debt (credit cards, mortgage, student loans)41%145
- Other33%119
- Calls pretending to be government, businesses, or family and friends9%31
* Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-07-05.
Which prefixes and exchanges belong to area code 605?
73% assigned to a telco
- 74% Landline
- 26% Wireless
- 0% Unknown
| Prefix | Usage | Carrier |
|---|---|---|
| (605)200- | Wireless | New Cingular Wireless Pcs |
| (605)201- | Wireless | New Cingular Wireless Pcs |
| (605)202- | Wireless | New Cingular Wireless Pcs |
| (605)203- | Wireless | New Cingular Wireless Pcs |
| (605)204- | Wireless | New Cingular Wireless Pcs |
| (605)205- | Wireless | New Cingular Wireless Pcs |
| (605)206- | Wireless | New Cingular Wireless Pcs |
| (605)207- | Wireless | New Cingular Wireless Pcs |
| (605)208- | Wireless | New Cingular Wireless Pcs |
| (605)209- | Wireless | New Cingular Wireless Pcs |
Frequently Asked Questions about the 605 Area Code
Who called me from a 605 number?
A 605 number is assigned to Sioux Falls, South Dakota, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 605 code to look nearby, so a 605 number doesn't prove the caller is local. Recently, 357 unwanted-call complaints were reported to the FTC for numbers showing the 605 code (80% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 605 a scam area code?
No area code is a scam on its own. 605 is a normal, officially assigned code for Sioux Falls, South Dakota. Spam callers spoof local codes to raise the odds you answer, so 605 on your caller ID says nothing about who is really calling. Recently, 357 unwanted-call complaints were reported to the FTC for numbers showing the 605 code (80% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 605 area code?
Repeated calls from different 605 numbers are usually spoofing: a robocaller rotates through 605 numbers so each call looks local and slips past simple blocks. Recently, 357 unwanted-call complaints were reported to the FTC for numbers showing the 605 code (80% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 605 number?
If you aren't expecting a 605 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 605 area code?
Block a single 605 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 605 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 605?
Area code 605 covers Sioux Falls and the surrounding area in South Dakota, spanning 390 cities with about 714,419 residents. No other code overlays this region, so 605 alone identifies the area.
Is 605 a real area code?
Yes. 605 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Sioux Falls, South Dakota. A real code can still show up on spoofed spam calls, so treat unknown 605 calls with normal caution.
What timezone is the 605 area code in?
The 605 area code is in the Central / Mountain. Because a number can be kept when someone moves or switches to VoIP, a specific 605 caller may not be in that zone.
How do I call a 605 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 605 and the seven-digit number. From a mobile phone you can usually just enter +1 605 followed by the number and let the phone add the exit code for you.