For AI agents: llms.txt.

Explore the 605 area code associated with Sioux Falls, SD. Check its location, dialing rules and related codes, or look up a full phone number.

Where is the 605 area code?

605 is a geographic area code associated with Sioux Falls, South Dakota, United States.

Communities associated with 605 in telephone numbering records include Rapid City, Aberdeen, Spearfish, Watertown, and Pierre. These are examples, not a complete list of places served or a map of municipal boundaries.

The area code tells you about a number’s assigned region. It does not locate a person or establish who is calling. For that, start with the full phone number and review any available evidence in context.

NANPA area-code database

NANPA: active telephone exchange records

NIST: daylight saving time rules

FTC: phone scams and caller ID spoofing

Frequently asked questions.