Area code 605 covers Sioux Falls and surrounding areas in South Dakota. It is one of the original 86 area codes established by AT&T in 1947. For the full picture, see all South Dakota area codes.
| State | South Dakota |
|---|---|
| Primary city | Sioux Falls |
| Cities also served | Sioux Falls, Rapid City, Aberdeen, Brookings, Watertown, Pierre, Mitchell, Yankton |
| Time zone | Central / Mountain (UTC-6 / UTC-5 DST (Central); UTC-7 / UTC-6 DST (Mountain)) |
| Year established | January 1, 1947 |
| Original 1947 NPA? | Yes |
| Overlay codes | None |
| Currently in use? | Yes, actively assigned |
| Ten-digit dialing required? | Local seven-digit dialing may still apply |
Cities Served by Area Code 605
Area code 605 serves Entire state of South Dakota, including the following cities and communities:
- Sioux Falls
- Rapid City
- Aberdeen
- Brookings
- Watertown
- Pierre
- Mitchell
- Yankton
How to Get a 605 Phone Number
There are three ways to get a phone number with the 605 area code, each suited to a different need:
- Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 605 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Browse our 605 inventory.
- Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 605 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
- Port an existing 605 number. If you already have a 605 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of South Dakota sometimes can’t accept inbound ports of 605 numbers due to 911 routing rules.
Looking for a 605 number? 212areacode.com offers premium 605 numbers for Sioux Falls, South Dakota — choose your number, port it to any carrier in 3–5 business days, and pay a one-time fee with no monthly charges. Browse available 605 numbers →
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Browse 605 Numbers →Frequently Asked Questions
Is the 605 area code still in use?
Yes. 605 is actively assigned to new phone lines in Entire state of South Dakota.
Can I get a 605 number if I don't live in South Dakota?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 605 number from anywhere in the world. The number routes to whatever device or carrier you specify.
Is 605 a scam area code?
No. 605 is a legitimate, active area code for Entire state of South Dakota. Like any area code, scammers occasionally spoof 605 caller IDs, but the code itself is heavily used by real South Dakota businesses, government offices, and residents.
What state is area code 605?
Area code 605 serves the entire state of South Dakota — every city, town, and county in the state uses this single area code.
Does area code 605 have any overlays?
No. As of 2026, 605 remains the sole area code for South Dakota with no overlay codes and no geographic splits in its history.
Why did South Dakota switch to ten-digit dialing?
In 2020, the FCC designated 988 as the nationwide dialing code for the Suicide & Crisis Lifeline. Because 605 had active 988-prefix numbers, South Dakota transitioned to mandatory ten-digit local dialing by October 24, 2021 to avoid conflicts.
What time zone is area code 605?
Most of South Dakota — including Sioux Falls and the eastern half of the state — falls in the Central Time Zone. The western portion, including Rapid City and the Black Hills, observes Mountain Time. Both zones observe daylight saving time.
