Based on area code 312, the phone number (312) 820-3781 is located in Illinois, United States. The 820 prefix was originally assigned to the CHICGOZN01 rate center, serving Chicago and its surrounding areas. However, due to phone number portability, the current location of this phone number may differ from its original assignment.
Looking for current location and owner details? Use our reverse phone lookup service below to find the unknown caller's name, address, and other information.