Region
Chicago, IL
+1 312 is a local or regional area code for Chicago, IL in USA/NANP.
National312
International+1 312
From abroad, place +1 312 before the local subscriber number. National formats can vary by country.
Region
+1 312 is a local or regional area code for Chicago, IL in USA/NANP.
From abroad, place +1 312 before the local subscriber number. National formats can vary by country.