678 is an Atlanta, GA area code
The area code for Marietta, GA is 770, with overlay codes 678 and 470.
Winder, GA, is in area codes 770, 678, and 470 (multi-overlay).
The country code and area code of Santa Rosa Del Monday, Paraguay is 595, (0)678.
505 is the area code for Zuni, New Mexico.
The country code and area code of Acambaro, Mexico is 52, (01)417.
The country code and area code of Imuris, Mexico is 52, (01)632.
The country code and area code of Amatlan, Mexico is 52, (01)768.
The country code and area code of Cupareo, Mexico is 52, (01)466.
The country code and area code of Chicomuselo, Mexico is 52, (01)963.
The country code and area code of Ahuacuotzingo, Mexico is 52, (01)756.
The country code and area code of Mirandillas, Mexico is 52, (01)347.