NPA-NXX - 605-640

This is the 605-640 subcode (NPA-NXX) prefix page. Follow a prefix to find the number you are looking for. We divide our pages up to make them more user friendly to navigate!

1. Area Codes
2. 605
3. 605-640

The 605-640 subcode mainly covers Na in Na county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of South Dakota state. Many of the numbers in this subcode are Cellular registered to . We hear they employ a large number of people in the South Dakota office.
Recently there have been an increase in reported calls, we've had over comments across our systems for the 605-640 subcode.