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) 529 | Chicago, IL | Cook | Landline |
| (312) 530 | Chicago, IL | Cook | Cell Number |
| (312) 531 | Hinsdale, IL | Du Page | Cell Number |
| (312) 532 | Chicago, IL | Cook | Cell Number |
| (312) 533 | Chicago, IL | Cook | Cell Number |
| (312) 534 | Chicago, IL | Not filled | Unknown |
| (312) 537 | Chicago, IL | Cook | Landline |
| (312) 540 | Chicago, IL | Cook | Landline |
| (312) 541 | Chicago, IL | Cook | Landline |
| (312) 542 | Chicago, IL | Cook | Landline |
| (312) 543 | Chicago, IL | Cook | Cell Number |
| (312) 544 | Chicago, IL | Cook | Landline |
| (312) 545 | Chicago, IL | Cook | Cell Number |
| (312) 546 | Chicago, IL | Cook | Landline |
| (312) 547 | Chicago, IL | Cook | Cell Number |
| (312) 548 | Chicago, IL | Not filled | Unknown |
| (312) 550 | Chicago, IL | Cook | Cell Number |
| (312) 551 | Chicago, IL | Cook | Landline |
| (312) 552 | Chicago, IL | Cook | Landline |
| (312) 553 | Chicago, IL | Cook | Landline |
| (312) 554 | Chicago, IL | Cook | Landline |
| (312) 556 | Chicago, IL | Cook | Cell Number |
| (312) 557 | Chicago, IL | Cook | Landline |
| (312) 558 | Chicago, IL | Cook | Landline |
| (312) 559 | Chicago, IL | Cook | Landline |
| (312) 560 | Chicago, IL | Cook | Cell Number |
| (312) 562 | Chicago, IL | Cook | Cell Number |
| (312) 563 | Chicago, IL | Cook | Landline |
| (312) 564 | Chicago, IL | Not filled | Unknown |
| (312) 565 | Chicago, IL | Cook | Landline |
| (312) 566 | Chicago, IL | Cook | Landline |
| (312) 567 | Chicago, IL | Cook | Landline |
| (312) 568 | Chicago, IL | Cook | Landline |
| (312) 569 | Chicago, IL | Cook | Landline |
| (312) 570 | Chicago, IL | Cook | Landline |
| (312) 571 | Chicago, IL | Cook | Cell Number |
| (312) 572 | Chicago, IL | Cook | Landline |
| (312) 573 | Chicago, IL | Cook | Landline |
| (312) 574 | Chicago, IL | Cook | Landline |
| (312) 575 | Chicago, IL | Cook | Landline |
| (312) 576 | Chicago, IL | Cook | Cell Number |
| (312) 577 | Chicago, IL | Cook | Landline |
| (312) 578 | Chicago, IL | Cook | Landline |
| (312) 580 | Chicago, IL | Cook | Landline |
| (312) 582 | Chicago, IL | Cook | Landline |
| (312) 583 | Chicago, IL | Cook | Landline |
| (312) 587 | Chicago, IL | Cook | Landline |
| (312) 588 | Chicago, IL | Cook | Landline |
| (312) 589 | Chicago, IL | Cook | Landline |
| (312) 590 | Chicago, IL | Cook | Cell Number |
| (312) 591 | Chicago, IL | Cook | Landline |
| (312) 592 | Chicago, IL | Cook | Landline |
| (312) 593 | Chicago, IL | Cook | Cell Number |
| (312) 594 | Chicago, IL | Not filled | Unknown |
| (312) 595 | Chicago, IL | Cook | Landline |
| (312) 596 | Chicago, IL | Cook | Landline |
| (312) 597 | Not filled | Cook | Cell Number |
| (312) 599 | Chicago, IL | Cook | Cell Number |
| (312) 601 | Chicago, IL | Cook | Landline |
| (312) 602 | Chicago, IL | Cook | Landline |
| (312) 603 | Chicago, IL | Cook | Landline |
| (312) 604 | Chicago, IL | Cook | Landline |
| (312) 605 | Not filled | Cook | Cell Number |
| (312) 606 | Chicago, IL | Cook | Landline |
| (312) 607 | Chicago, IL | Cook | Cell Number |
| (312) 608 | Chicago, IL | Cook | Cell Number |
| (312) 609 | Chicago, IL | Cook | Landline |
| (312) 610 | Not filled | Cook | Cell Number |
| (312) 612 | Chicago, IL | Cook | Landline |
| (312) 613 | Chicago, IL | Cook | Cell Number |
| (312) 614 | Not filled | Cook | Cell Number |
| (312) 615 | Wheeling, IL | Cook | Cell Number |
| (312) 616 | Chicago, IL | Cook | Landline |
| (312) 617 | Chicago, IL | Cook | Cell Number |
| (312) 618 | Chicago, IL | Cook | Cell Number |
| (312) 619 | Not filled | Cook | Cell Number |
| (312) 621 | Chicago, IL | Cook | Landline |
| (312) 622 | Chicago, IL | Cook | Cell Number |
| (312) 623 | Chicago, IL | Cook | Cell Number |
| (312) 624 | Chicago, IL | Cook | Landline |
| (312) 625 | Chicago, IL | Cook | Landline |
| (312) 626 | Chicago, IL | Not filled | Unknown |
| (312) 627 | Chicago, IL | Cook | Landline |
| (312) 628 | Chicago, IL | Cook | Landline |
| (312) 629 | Chicago, IL | Cook | Landline |
| (312) 630 | Chicago, IL | Cook | Landline |
| (312) 632 | Chicago, IL | Cook | Landline |
| (312) 633 | Chicago, IL | Cook | Landline |
| (312) 634 | Chicago, IL | Cook | Landline |
| (312) 635 | Chicago, IL | Cook | Landline |
| (312) 636 | Chicago, IL | Cook | Cell Number |
| (312) 637 | Chicago, IL | Cook | Landline |
| (312) 638 | Chicago, IL | Cook | Landline |
| (312) 639 | Chicago, IL | Cook | Cell Number |
| (312) 640 | Chicago, IL | Cook | Landline |
| (312) 641 | Chicago, IL | Cook | Landline |
| (312) 642 | Chicago, IL | Cook | Landline |
| (312) 643 | Chicago, IL | Cook | Landline |
| (312) 644 | Chicago, IL | Cook | Landline |
| (312) 645 | Chicago, IL | Cook | Landline |
We have 695 Prefixes in our database.