Area code
Area code 605 — Sioux Falls, SD
South Dakota · in service since 1947
Area code 605 covers all of South Dakota. No other area code overlays it.
Local time in Sioux Falls
Spam reports from Sep 23 – Oct 22, 2026
Average #323 of 461 codes
218 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zonesCentral Time, Mountain Time
- Local calls10 digits
- Prefixes759 assigned
- Runs out~3Q 2034
- Unwanted call?Block & report
Spam call reports about 605 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 10 |
| Sep 14 | 67 |
| Sep 21 | 43 |
| Sep 28 | 52 |
| Oct 5 | 57 |
| Oct 12 | 50 |
| Oct 19 (4 days) | 29 |
Compared with all codes
- Robocalls
- 79%all codes 75%
- Callers with the same code
- 41%all codes 35%
- Rank by complaints
- #323of 461 · middle half
- FCC complaints, Oct 2025 – Sep 2026
- 657 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Reducing your debt (credit cards, mortgage, student loans) | 66 21% | |
| Dropped call or no message | 42 14% | |
| Calls pretending to be government, businesses, or family and friends | 36 12% | |
| Medical & prescriptions | 7 2% | |
| Warranties & protection plans | 6 2% | |
| Vacation & timeshares | 5 2% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| South Dakota | 113 37% | |
| California | 29 9% | |
| Ohio | 14 5% | |
| Georgia | 10 3% | |
| Texas | 10 3% |
October 2026 (partial) report · most reported
Consumer reports, not verified by the FTC · source
Source: FTC Do Not Call complaints created Sep 11 – Oct 22, 2026. They are reported by consumers and are not verified by the FTC; caller ID can be spoofed (how we count).
Source: FCC Consumer Complaints data, unwanted calls filed Oct 1, 2025 – Sep 30, 2026, by caller ID; not verified by the FCC.
Area code 605 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| SIOUX FLS | Sioux Falls | spans 2 counties | 92 |
| RAPID CITY | Rapid City | Pennington County | 50 |
| ABERDEEN | Aberdeen | Brown County | 22 |
| SPEARFISH | Spearfish | Lawrence County | 20 |
| WATERTOWN | Watertown | Codington County | 17 |
| HURON | Huron | Beadle County | 15 |
| PIERRE | Pierre | Hughes County | 15 |
| YANKTON | Yankton | Yankton County | 14 |
| MITCHELL | Mitchell | Davison County | 13 |
| BROOKINGS | Brookings | Brookings County | 11 |
Plus 259 smaller exchange areas.
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
NANPA record
- Location
- South Dakota
- Assigned by NANPA
- 1947
- Local dialing
- 10 digits (NANPA: 10D)
- NANPA planning letters
- PL-556, PL-544
Source: NANPA, NPA database of Oct 24, 2026.
Is 605 running out of numbers?
Previous forecast (October 2025): 2033, moved later by 1 year.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 605 prefixes
The five largest of 91 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Qwest Corporation | 104 14% | |
| Verizon Wireless | 100 13% | |
| New Cingular Wireless PCS, LLC | 81 11% | |
| Midcontinent Communications. | 34 4% | |
| Bluepeak | 32 4% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 605
What area code is 605?
A South Dakota area code, in service since 1947.
Where is 605 area code, and what time zone is it in?
Sioux Falls, SD; Central Time and Mountain Time.
Why am I getting spam calls from 605?
218 FTC complaints from Sep 23 – Oct 22, 2026, most often about debt reduction (not verified by the FTC; caller ID can be spoofed).
Will 605 get a new area code?
NANPA forecasts exhaust in 3Q 2034; no relief planning listed.