Area code 605
Area code 605 serves Sioux Falls and nearby parts of South Dakota, including Rapid City, Aberdeen and Brookings. It crosses a time zone line, so part of the code is on Central Time and part is on Mountain Time.
Sioux Falls, Aberdeen, Brookings and eastern South Dakota.
Rapid City and western South Dakota.
Area code 605 at a glance
| State | South Dakota (SD) |
| Main city | Sioux Falls |
| Time zone | Central Time and Mountain Time |
| UTC offset | Central Time: UTC−6 in winter, UTC−5 in summer Mountain Time: UTC−7 in winter, UTC−6 in summer |
| Daylight saving time | Yes |
Cities in 605
- Sioux Falls
- Rapid City
- Aberdeen
- Brookings
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 605 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Because this code spans two time zones, the times below cover only the hours that are allowed in both parts.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 605 between |
|---|---|
| Eastern | 10:00 AM to 10:00 PM |
| Central | 9:00 AM to 9:00 PM |
| Mountain | 8:00 AM to 8:00 PM |
| Arizona | 7:00 AM to 7:00 PM |
| Pacific | 7:00 AM to 7:00 PM |
See the time in 605 without leaving your CRM
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Other area codes in South Dakota
605 is the only area code in our list for South Dakota.
Questions about 605
What time zone is area code 605?
Area code 605 crosses a time zone line. Sioux Falls, Aberdeen, Brookings and eastern South Dakota are on Central Time, and Rapid City and western South Dakota are on Mountain Time. It observes daylight saving time.
Where is area code 605?
Area code 605 is in South Dakota. Its main city is Sioux Falls, and it also covers Rapid City, Aberdeen and Brookings.
What are the legal hours to call a 605 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.