605 Area Code: Sioux Falls, South Dakota
Area code 605 serves Sioux Falls, Rapid City and Aberdeen, South Dakota in the Central and Mountain time zone, in service since 1947. Consumers have filed 2,536 unwanted-call complaints against 2,108 different 605 numbers, 208 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 605 at a glance
- State
- South Dakota
- Main cities
- Sioux Falls, Rapid City, Aberdeen, Spearfish, Watertown, Huron + 248 more
- Counties
- Minnehaha County, Pennington County, Brown County, Beadle County + 62 more
- Local time
- —Central—Mountain
- In service since
- 1947
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 269 rate centers, 745 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Most-reported 605 numbers
Ranked by FTC Do Not Call complaints this month, then all-time FTC and FCC complaints. Only numbers with enough complaints for a full report page are listed. Click one for what it was reported for and where.
What calls from 605 numbers are about
722 FTC Do Not Call complaints about 605 numbers since Jul 24. The most common named subject is debt-relief pitches, at 26% of complaints (93% of those were recorded messages). Overall, 75% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified26537%
- Debt reduction18726%
- Dropped call / no message8512%
- Impostor (government, business, family)7611%
- No subject given345%
- Warranties & protection plans213%
- Medical & prescriptions213%
FCC complaints by call type, last 2 years
- Prerecorded Voice7351%
- Live Voice4632%
- Text Message2517%
17% of recent FCC complaints about 605 numbers are about text messages, not calls.
When 605 spam calls come in
29% of complaints that give a call time describe calls between 1pm and 4pm. 90% came Monday to Friday, most on Tuesdays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
205 FTC complaints about 605 numbers in the last four weeks, down 10% on the four weeks before. FCC complaints about 605 numbers peaked in 2017 (270); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
Only 37% of the FTC complaints about 605 numbers came from South Dakota residents; the most came from California, Texas and Florida. 605 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Where complainants live
- South Dakota26437%
- California487%
- Texas365%
- Florida345%
- Georgia213%
What people with 605 numbers report
People whose own number starts with 605 filed 1,128 FTC complaints since Jul 24. 26% were about calls showing another 605 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 605 (same code)28926%
- 888 (toll-free)646%
- 833 (toll-free)636%
- 877 (toll-free)535%
- 866 (toll-free)525%
Likely campaigns using 605 numbers
Groups of numbers that drew the same FTC complaint in the same pattern over the last 60 days. The grouping is statistical and doesn't identify who is calling.
Busiest 605 prefixes this month
FTC complaints in the last 30 days, grouped by the first six digits. When one prefix collects complaints about many different numbers, a campaign is usually cycling through that block. The carrier is who NANPA assigned the prefix to, not who made the calls.
| Prefix | Complaints | Numbers | Carrier | Exchange |
|---|---|---|---|---|
| (605) 409-xxxxcampaign | 9 | 9 | Verizon Wireless (Cellco Partnership) | Harrisburg–Tea |
| (605) 316-xxxx | 8 | 7 | Airus, INC. | Iroquois |
| (605) 836-xxxx | 8 | 7 | MCImetro (Verizon Business) | Canton |
| (605) 205-xxxx | 6 | 6 | AT&T Mobility (New Cingular Wireless PCS) | Elk Point |
| (605) 546-xxxx | 6 | 6 | Qwest (CenturyLink / Lumen) | Iroquois |
Carriers operating in 605
NANPA has assigned 745 605 prefixes (NPA-NXX central-office codes) across 269 rate centers: 29% to wireless carriers, 67% to landline and VoIP operators; 49% are pooled blocks shared by several carriers. 5 prefixes were assigned in the last 12 months (newest 2026-08-04). The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| Qwest (CenturyLink / Lumen) | Incumbent landline (ILEC) | 104(14%) | 33 | 2017-03-23 |
| Verizon Wireless (Cellco Partnership) | Wireless | 100(13%) | 41 | 2025-03-14 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 81(11%) | 41 | 2026-04-23 |
| Midcontinent Communications. | Competitive / VoIP (CLEC) | 34(5%) | 29 | 2017-08-02 |
| Clarity Telecom, LLC dba Bluepeak | Competitive / VoIP (CLEC) | 32(4%) | 23 | 2011-02-21 |
| Venture Communications Cooperative | Incumbent landline (ILEC) | 30(4%) | 27 | — |
| Golden West Tel Coop INC dba Golden West Telecomm | Incumbent landline (ILEC) | 27(4%) | 27 | — |
| Interstate Telecom Coop, INC. | Incumbent landline (ILEC) | 27(4%) | 26 | — |
| Aerial Communications, INC. | Wireless | 19(3%) | 10 | 2026-08-04 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 19(3%) | 14 | 2025-02-17 |
| Vivian Tel CO dba Golden West Telecommunications | Incumbent landline (ILEC) | 19(3%) | 19 | — |
| Bandwidth.com | Competitive / VoIP (CLEC) | 14(2%) | 11 | 2026-05-08 |
Largest rate centers (exchanges) by prefixes: Sioux Falls (92), Rapid City (50), Aberdeen (22), Spearfish (20), Watertown (17), Huron (15), Pierre (15), Yankton (14), Mitchell (13), Brookings (11). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 605 numbers
Before you call back
- Debt reduction is the top named complaint here. Don't pay upfront fees for debt relief; the FTC's Telemarketing Sales Rule bans them. Talk to your lender or a nonprofit credit counselor instead. Read about debt-relief robocalls.
- Look up the full number above. A missed call from 605 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in South Dakota
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
- State complaints: South Dakota Consumer Protection.
- South Dakota formally adopted the FTC's National Do Not Call Registry as its own state list rather than running a separate one, so a single free registration at donotcall.gov covers you. State authorities can still enforce against telemarketers who ignore it, in addition to any federal penalty.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 605: questions answered from the data
Where is area code 605?
Area code 605 serves Sioux Falls, Rapid City and Aberdeen, South Dakota, covering Minnehaha County, Pennington County and Brown County and 63 more counties. It has been in service since 1947.
What time zone is area code 605 in?
Area code 605 spans Central and Mountain time. Most of it is in the Central zone (UTC−6, or UTC−5 during daylight saving time). The current local time in each zone is shown at the top of this page.
What are calls from 605 numbers usually about?
Since Jul 24, consumers filed 722 FTC Do Not Call complaints about 605 numbers. The most common named subject was debt-relief pitches: 26% of complaints, 93% of them recorded messages. Across all subjects, 75% of callers who answered the question said the call was a robocall.
When do 605 spam calls happen?
29% of the complaints that give a call time describe calls between 1pm and 4pm, and 90% came on weekdays, most often on Tuesday. Times are as consumers reported them.
Are calls from 605 numbers really local?
Not necessarily. Only 37% of the FTC complaints about 605 numbers came from South Dakota residents; the most came from California, Texas and Florida. 605 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Are 605 robocalls increasing?
In the four weeks to Oct 20, consumers filed 205 FTC complaints about 605 numbers, 10% fewer than the four weeks before.
How do I report a 605 scam call in South Dakota?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. In South Dakota, the South Dakota Consumer Protection also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Other South Dakota area codes
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.