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) 415 | Chicago, IL | Cook | Cell Number |
| (312) 416 | Chicago, IL | Cook | Landline |
| (312) 417 | Chicago, IL | Cook | Cell Number |
| (312) 418 | Chicago, IL | Cook | Cell Number |
| (312) 419 | Chicago, IL | Cook | Landline |
| (312) 420 | Chicago, IL | Cook | Cell Number |
| (312) 421 | Chicago, IL | Cook | Landline |
| (312) 422 | Chicago, IL | Cook | Landline |
| (312) 423 | Chicago, IL | Cook | Landline |
| (312) 424 | Chicago, IL | Cook | Landline |
| (312) 425 | Chicago, IL | Cook | Landline |
| (312) 426 | Chicago, IL | Cook | Cell Number |
| (312) 427 | Chicago, IL | Cook | Landline |
| (312) 428 | Chicago, IL | Cook | Cell Number |
| (312) 429 | Chicago, IL | Cook | Landline |
| (312) 430 | Chicago, IL | Cook | Landline |
| (312) 431 | Chicago, IL | Cook | Landline |
| (312) 432 | Chicago, IL | Cook | Landline |
| (312) 433 | Chicago, IL | Cook | Landline |
| (312) 434 | Not filled | Not filled | Unknown |
| (312) 435 | Chicago, IL | Cook | Landline |
| (312) 436 | Chicago, IL | Cook | Landline |
| (312) 437 | Chicago, IL | Cook | Cell Number |
| (312) 438 | Not filled | Cook | Cell Number |
| (312) 440 | Chicago, IL | Cook | Landline |
| (312) 441 | Chicago, IL | Cook | Landline |
| (312) 442 | Chicago, IL | Cook | Landline |
| (312) 443 | Chicago, IL | Cook | Landline |
| (312) 444 | Chicago, IL | Cook | Landline |
| (312) 445 | Chicago, IL | Cook | Landline |
| (312) 446 | Chicago, IL | Cook | Cell Number |
| (312) 447 | Chicago, IL | Cook | Landline |
| (312) 449 | Chicago, IL | Cook | Cell Number |
| (312) 450 | Chicago, IL | Cook | Cell Number |
| (312) 451 | Chicago, IL | Cook | Landline |
| (312) 452 | Chicago, IL | Cook | Cell Number |
| (312) 453 | Chicago, IL | Cook | Landline |
| (312) 454 | Chicago, IL | Cook | Landline |
| (312) 455 | Chicago, IL | Cook | Landline |
| (312) 456 | Chicago, IL | Cook | Landline |
| (312) 457 | Chicago, IL | Cook | Cell Number |
| (312) 458 | Chicago, IL | Cook | Landline |
| (312) 460 | Chicago, IL | Cook | Landline |
| (312) 461 | Chicago, IL | Cook | Landline |
| (312) 462 | Chicago, IL | Cook | Landline |
| (312) 463 | Chicago, IL | Cook | Landline |
| (312) 464 | Chicago, IL | Cook | Landline |
| (312) 465 | Chicago, IL | Cook | Landline |
| (312) 466 | Chicago, IL | Cook | Landline |
| (312) 467 | Chicago, IL | Cook | Landline |
| (312) 469 | Chicago, IL | Cook | Landline |
| (312) 470 | Chicago, IL | Cook | Landline |
| (312) 472 | Chicago, IL | Cook | Landline |
| (312) 473 | Chicago, IL | Not filled | Unknown |
| (312) 474 | Chicago, IL | Cook | Landline |
| (312) 475 | Chicago, IL | Cook | Landline |
| (312) 476 | Chicago, IL | Cook | Landline |
| (312) 477 | Chicago, IL | Not filled | Unknown |
| (312) 478 | Not filled | Cook | Landline |
| (312) 479 | Chicago, IL | Cook | Landline |
| (312) 480 | Chicago, IL | Cook | Cell Number |
| (312) 482 | Chicago, IL | Cook | Landline |
| (312) 484 | Chicago, IL | Cook | Cell Number |
| (312) 485 | Chicago, IL | Cook | Cell Number |
| (312) 486 | Chicago, IL | Cook | Landline |
| (312) 488 | Chicago, IL | Not filled | Unknown |
| (312) 489 | Chicago, IL | Cook | Cell Number |
| (312) 490 | Chicago, IL | Cook | Cell Number |
| (312) 491 | Chicago, IL | Cook | Landline |
| (312) 492 | Chicago, IL | Cook | Landline |
| (312) 493 | Chicago, IL | Cook | Cell Number |
| (312) 494 | Chicago, IL | Cook | Landline |
| (312) 495 | Chicago, IL | Cook | Cell Number |
| (312) 496 | Chicago, IL | Cook | Landline |
| (312) 497 | Chicago, IL | Cook | Cell Number |
| (312) 498 | Chicago, IL | Cook | Cell Number |
| (312) 499 | Chicago, IL | Cook | Landline |
| (312) 501 | La Grange Park, IL | Cook | Cell Number |
| (312) 502 | Chicago, IL | Cook | Cell Number |
| (312) 503 | Chicago, IL | Cook | Landline |
| (312) 504 | Chicago, IL | Cook | Cell Number |
| (312) 505 | Chicago, IL | Cook | Cell Number |
| (312) 506 | Chicago, IL | Cook | Landline |
| (312) 507 | Chicago, IL | Cook | Landline |
| (312) 510 | Hinsdale, IL | Du Page | Cell Number |
| (312) 512 | Chicago, IL | Cook | Cell Number |
| (312) 513 | Chicago, IL | Cook | Cell Number |
| (312) 514 | Chicago, IL | Cook | Cell Number |
| (312) 515 | Chicago, IL | Cook | Cell Number |
| (312) 516 | Chicago, IL | Cook | Landline |
| (312) 518 | Wheeling, IL | Cook | Cell Number |
| (312) 519 | Chicago, IL | Cook | Cell Number |
| (312) 520 | Chicago, IL | Cook | Cell Number |
| (312) 521 | Chicago, IL | Cook | Landline |
| (312) 523 | Chicago, IL | Cook | Cell Number |
| (312) 524 | Wheeling, IL | Cook | Cell Number |
| (312) 525 | Chicago, IL | Cook | Landline |
| (312) 526 | Chicago, IL | Cook | Landline |
| (312) 527 | Chicago, IL | Cook | Landline |
| (312) 528 | Chicago, IL | Cook | Landline |
We have 695 Prefixes in our database.