Area Code 312 is located in the state of Illinois.
The Illinois`s major city is Chicago
The state of Illinois is in Central timezone.
More important cities in Illinois:
Chicago, IL;
Prefixes within the 312 Area Code what we have in our database.
| Prefix | Primary City | County | Usage |
| (312) 646 | Chicago, IL | Not filled | Unknown |
| (312) 647 | Chicago, IL | Cook | Cell Number |
| (312) 648 | Chicago, IL | Cook | Landline |
| (312) 649 | Chicago, IL | Cook | Landline |
| (312) 650 | Chicago, IL | Cook | Landline |
| (312) 651 | Chicago, IL | Cook | Landline |
| (312) 652 | Chicago, IL | Cook | Landline |
| (312) 653 | Chicago, IL | Cook | Landline |
| (312) 654 | Chicago, IL | Cook | Landline |
| (312) 655 | Chicago, IL | Cook | Landline |
| (312) 656 | Chicago, IL | Cook | Cell Number |
| (312) 657 | Chicago, IL | Cook | Cell Number |
| (312) 658 | Chicago, IL | Cook | Landline |
| (312) 659 | Chicago, IL | Cook | Cell Number |
| (312) 660 | Chicago, IL | Cook | Landline |
| (312) 661 | Chicago, IL | Cook | Landline |
| (312) 662 | Chicago, IL | Cook | Landline |
| (312) 663 | Chicago, IL | Cook | Landline |
| (312) 664 | Chicago, IL | Cook | Landline |
| (312) 665 | Chicago, IL | Cook | Landline |
| (312) 666 | Chicago, IL | Cook | Landline |
| (312) 669 | Chicago, IL | Cook | Landline |
| (312) 670 | Chicago, IL | Cook | Landline |
| (312) 671 | Chicago, IL | Cook | Cell Number |
| (312) 672 | Chicago, IL | Cook | Landline |
| (312) 673 | Chicago, IL | Cook | Landline |
| (312) 674 | Chicago, IL | Cook | Landline |
| (312) 675 | Chicago, IL | Cook | Landline |
| (312) 676 | Chicago, IL | Not filled | Unknown |
| (312) 677 | Chicago, IL | Cook | Cell Number |
| (312) 678 | Not filled | Cook | Cell Number |
| (312) 679 | Chicago, IL | Cook | Cell Number |
| (312) 680 | Chicago, IL | Cook | Cell Number |
| (312) 681 | Chicago, IL | Cook | Landline |
| (312) 682 | Chicago, IL | Cook | Cell Number |
| (312) 683 | Chicago, IL | Cook | Landline |
| (312) 685 | Chicago, IL | Cook | Cell Number |
| (312) 688 | Chicago, IL | Cook | Cell Number |
| (312) 689 | Chicago, IL | Cook | Cell Number |
| (312) 690 | Not filled | Cook | Cell Number |
| (312) 691 | Chicago, IL | Cook | Cell Number |
| (312) 692 | Chicago, IL | Cook | Landline |
| (312) 693 | Chicago, IL | Cook | Landline |
| (312) 694 | Chicago, IL | Cook | Landline |
| (312) 695 | Chicago, IL | Cook | Landline |
| (312) 696 | Chicago, IL | Cook | Landline |
| (312) 697 | Chicago, IL | Cook | Landline |
| (312) 698 | Chicago, IL | Cook | Landline |
| (312) 699 | Hinsdale, IL | Du Page | Cell Number |
| (312) 701 | Chicago, IL | Cook | Landline |
| (312) 703 | Chicago, IL | Cook | Cell Number |
| (312) 704 | Chicago, IL | Cook | Landline |
| (312) 705 | Chicago, IL | Cook | Landline |
| (312) 706 | Chicago, IL | Cook | Landline |
| (312) 707 | Chicago, IL | Cook | Landline |
| (312) 709 | Not filled | Cook | Cell Number |
| (312) 710 | Chicago, IL | Cook | Landline |
| (312) 712 | Chicago, IL | Cook | Landline |
| (312) 713 | Chicago, IL | Cook | Cell Number |
| (312) 714 | Chicago, IL | Cook | Landline |
| (312) 715 | Chicago, IL | Cook | Landline |
| (312) 716 | Chicago, IL | Cook | Cell Number |
| (312) 717 | La Grange Park, IL | Cook | Cell Number |
| (312) 718 | Chicago, IL | Cook | Cell Number |
| (312) 719 | Chicago, IL | Cook | Cell Number |
| (312) 720 | Chicago, IL | Cook | Cell Number |
| (312) 724 | Not filled | Cook | Cell Number |
| (312) 725 | Chicago, IL | Not filled | Unknown |
| (312) 726 | Chicago, IL | Cook | Landline |
| (312) 727 | Chicago, IL | Cook | Landline |
| (312) 729 | Chicago, IL | Cook | Landline |
| (312) 730 | Chicago, IL | Cook | Landline |
| (312) 731 | Chicago, IL | Cook | Landline |
| (312) 732 | Chicago, IL | Cook | Landline |
| (312) 733 | Chicago, IL | Cook | Landline |
| (312) 735 | Chicago, IL | Cook | Cell Number |
| (312) 737 | Chicago, IL | Cook | Landline |
| (312) 738 | Chicago, IL | Cook | Landline |
| (312) 739 | Chicago, IL | Cook | Landline |
| (312) 740 | Chicago, IL | Cook | Cell Number |
| (312) 742 | Chicago, IL | Cook | Landline |
| (312) 743 | Chicago, IL | Cook | Landline |
| (312) 744 | Chicago, IL | Cook | Landline |
| (312) 745 | Chicago, IL | Cook | Landline |
| (312) 746 | Chicago, IL | Cook | Landline |
| (312) 747 | Chicago, IL | Cook | Landline |
| (312) 748 | Chicago, IL | Cook | Cell Number |
| (312) 749 | Hinsdale, IL | Du Page | Cell Number |
| (312) 750 | Chicago, IL | Cook | Landline |
| (312) 751 | Chicago, IL | Cook | Landline |
| (312) 752 | Chicago, IL | Cook | Landline |
| (312) 753 | Chicago, IL | Cook | Landline |
| (312) 755 | Chicago, IL | Cook | Landline |
| (312) 756 | Chicago, IL | Cook | Landline |
| (312) 758 | Chicago, IL | Cook | Cell Number |
| (312) 759 | Chicago, IL | Cook | Landline |
| (312) 760 | Chicago, IL | Cook | Cell Number |
| (312) 762 | Chicago, IL | Cook | Landline |
| (312) 765 | Chicago, IL | Cook | Landline |
| (312) 766 | Not filled | Cook | Cell Number |
We have 695 Prefixes in our database.