Reason For Google Analytics Country Not Set

Google Analytics may sometimes display country data where it says (not set). According to the Google Analytics’ help section, this is what they say:

“Google Analytics uses your visitors’ IP address to determine where they are located geographically. Using a 3rd-party datasource, the IP address is translated to a physical location. In most cases, Google Analytics is able to determine where your visitors are coming from; however, if our 3rd party vendor does not have an accurate record of the IP address to determine the location, Google Analytics will display a “(not set)” entry.”