The area code (phone code) 0641 is assigned to 3 locations in Germany. Mainly you reach landlines in Gießen, Lahn (Hessen).
|0641||Heuchelheim, Kreis Gießen|
Note for calls from abroad: In addition to the German country code (+49 or 0049) you can omit the foregoing zero of the dialling code for Gießen, Lahn. So you can dial +49641... and add the number of the phone line you want to reach.