605 Area Code — Sioux Falls, SD
Area code 605 serves Sioux Falls and 3 other cities in South Dakota. Local time follows America/Chicago. It has no overlay codes.
- State
- South Dakota
- Primary city
- Sioux Falls
- Timezone
- America/Chicago
- In service since
- 1947
- Type
- Geographic
- Overlay codes
- None
Cities Served by 605
The 605 area code covers 4 cities and communities in South Dakota.
- Sioux Falls
- Rapid City
- Aberdeen
- Brookings
About Area Code 605
Area code 605 is a North American Numbering Plan (NANP) area code that has been in service since 1947. It is administered by NANPA on behalf of the FCC and serves the South Dakota region anchored on Sioux Falls.
605 is currently a single-coverage geographic area code with no overlays. This means a 7-digit number in this area code is unique within its rate centers, though best-practice is always to dial the full 10-digit number when contacting a 605 line.
Mobile numbers in 605 are portable: a person who moved away from Sioux Falls may still carry a 605 mobile number on their device. If you receive an unexpected call from a 605 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in South Dakota, you may also interact with neighbouring or overlay codes. See the related codes section below to explore the rest of South Dakota.
605 Area Code FAQ
Where is area code 605?
Area code 605 is located in South Dakota, primarily serving Sioux Falls and surrounding cities including Rapid City, Aberdeen, Brookings. The region operates on CT (America/Chicago) time.
What state is 605 area code?
605 is a South Dakota area code. It was put into service in 1947 and has no overlay codes — it covers its geographic area exclusively.
Is 605 a scam area code?
605 is a legitimate North American area code allocated by NANPA to South Dakota. Like any geographic area code, scammers sometimes spoof 605 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 605 use?
Area code 605 operates on CT (America/Chicago). Numbers in this area code follow standard South Dakota time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 605 phone number?
Yes. Use the reverse lookup widget above to enter a full 605 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.