Area code 605 — Sioux Falls, South Dakota

Where is area code 605?

Area code 605 is in Sioux Falls, South Dakota, covering Sioux Falls and surrounding communities in South Dakota. All 605 numbers are on Central Time.

Is area code 605 a scam?

No. Area code 605 is a legitimate area code serving Sioux Falls since 1947. Scammers spoof caller ID to display 605 numbers, which is why complaints exist against a code that is itself genuine.

Neighbour spoofing is the reason a local-looking number is not a guarantee. A caller anywhere in the world can display a 605 number, and the number they display may belong to a real business in Sioux Falls that has nothing to do with the call.

• ·Area code 605 had 233 different numbers reported for spam calls in the 30 days to 28 July 2026.
• ·Area code 605 ranks 247th of 331 US geographic area codes by spam complaint volume.
• ·Of the 243 complaints about area code 605 in the 30 days to 28 July 2026, 70% were reported as a recorded message or robocall.
• ·The most reported subject on area code 605 is reducing your debt (credit cards, mortgage, student loans), appearing in 40% of its complaints in the 30 days to 28 July 2026.

What these calls were about

Each figure is that subject’s share of every 605 complaint in the 30 days to 28 July 2026, as categorised by the consumer who reported it.

Businesses can prevent their own numbers from being mistaken for calls like these.

Why am I getting text messages from area code 605?

Texts from 605 numbers follow the same pattern as calls — mostly local businesses and services. Treat any text asking for payment or credentials as suspect regardless of the code.

The common patterns are a wrong-number opener that turns into conversation, an unsolicited job offer, and a crypto or investment tip. Do not reply, do not follow the link, and forward the message to 7726 (SPAM) to report it to your carrier.

Who works in the Sioux Falls area?

Area code 605 is one of the originals from 1947 and covers the entire state of South Dakota. That makes it unusual: a 605 number could belong to a rancher near the Black Hills or a credit card operations center in Sioux Falls, four hundred miles east. Sioux Falls is where the business weight sits. The city became a national banking hub after South Dakota lifted interest rate caps in 1981, drawing Citibank and, later, Wells Fargo operations that employ thousands. Healthcare rivals finance: Sanford Health and Avera Health both run their headquarters and largest hospitals here. Sioux Falls, South Dakota had a population of 201,469 and a median household income of $75,970 in 2024, per DataUSA, with a poverty rate of 9.62 percent, low by national standards.

Who lives in the 605 region

One code for one state shapes how the number reads. A 605 number says South Dakota, full stop, and within the state it carries no geographic snobbery because everyone from Rapid City to Brookings shares it. Callers describe business conversation here as unhurried and plain, with less small talk than the South but more than the coasts, and a handshake reputation that still matters in agriculture, trucking, and community banking. Callers from outside should check the clock before dialing: the state splits between Central Time in the east, where Sioux Falls sits, and Mountain Time in the west. The state's lack of corporate income tax also means the person on the other end may be a trust company or holding entity rather than a storefront.

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