A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 421, ELK GROVE VILLAGE, IL 60009-0421
PO BOX 422, ELK GROVE VILLAGE, IL 60009-0422
PO BOX 423, ELK GROVE VILLAGE, IL 60009-0423
PO BOX 424, ELK GROVE VILLAGE, IL 60009-0424
PO BOX 425, ELK GROVE VILLAGE, IL 60009-0425
PO BOX 426, ELK GROVE VILLAGE, IL 60009-0426
PO BOX 427, ELK GROVE VILLAGE, IL 60009-0427
PO BOX 428, ELK GROVE VILLAGE, IL 60009-0428
PO BOX 429, ELK GROVE VILLAGE, IL 60009-0429
PO BOX 430, ELK GROVE VILLAGE, IL 60009-0430
PO BOX 431, ELK GROVE VILLAGE, IL 60009-0431
PO BOX 432, ELK GROVE VILLAGE, IL 60009-0432
PO BOX 433, ELK GROVE VILLAGE, IL 60009-0433
PO BOX 434, ELK GROVE VILLAGE, IL 60009-0434
PO BOX 435, ELK GROVE VILLAGE, IL 60009-0435
PO BOX 436, ELK GROVE VILLAGE, IL 60009-0436
PO BOX 437, ELK GROVE VILLAGE, IL 60009-0437
PO BOX 438, ELK GROVE VILLAGE, IL 60009-0438
PO BOX 439, ELK GROVE VILLAGE, IL 60009-0439
PO BOX 440, ELK GROVE VILLAGE, IL 60009-0440
PO BOX 441, ELK GROVE VILLAGE, IL 60009-0441
PO BOX 442, ELK GROVE VILLAGE, IL 60009-0442
PO BOX 443, ELK GROVE VILLAGE, IL 60009-0443
PO BOX 444, ELK GROVE VILLAGE, IL 60009-0444
PO BOX 445, ELK GROVE VILLAGE, IL 60009-0445
PO BOX 446, ELK GROVE VILLAGE, IL 60009-0446
PO BOX 447, ELK GROVE VILLAGE, IL 60009-0447
PO BOX 448, ELK GROVE VILLAGE, IL 60009-0448
PO BOX 449, ELK GROVE VILLAGE, IL 60009-0449
PO BOX 450, ELK GROVE VILLAGE, IL 60009-0450
PO BOX 451, ELK GROVE VILLAGE, IL 60009-0451
PO BOX 452, ELK GROVE VILLAGE, IL 60009-0452
PO BOX 453, ELK GROVE VILLAGE, IL 60009-0453
PO BOX 454, ELK GROVE VILLAGE, IL 60009-0454
PO BOX 455, ELK GROVE VILLAGE, IL 60009-0455
PO BOX 456, ELK GROVE VILLAGE, IL 60009-0456
PO BOX 457, ELK GROVE VILLAGE, IL 60009-0457
PO BOX 458, ELK GROVE VILLAGE, IL 60009-0458
PO BOX 459, ELK GROVE VILLAGE, IL 60009-0459
PO BOX 460, ELK GROVE VILLAGE, IL 60009-0460
PO BOX 461, ELK GROVE VILLAGE, IL 60009-0461
PO BOX 462, ELK GROVE VILLAGE, IL 60009-0462
PO BOX 463, ELK GROVE VILLAGE, IL 60009-0463
PO BOX 464, ELK GROVE VILLAGE, IL 60009-0464
PO BOX 465, ELK GROVE VILLAGE, IL 60009-0465
PO BOX 466, ELK GROVE VILLAGE, IL 60009-0466
PO BOX 467, ELK GROVE VILLAGE, IL 60009-0467
PO BOX 468, ELK GROVE VILLAGE, IL 60009-0468
PO BOX 469, ELK GROVE VILLAGE, IL 60009-0469
PO BOX 470, ELK GROVE VILLAGE, IL 60009-0470
PO BOX 471, ELK GROVE VILLAGE, IL 60009-0471
PO BOX 472, ELK GROVE VILLAGE, IL 60009-0472
PO BOX 473, ELK GROVE VILLAGE, IL 60009-0473
PO BOX 474, ELK GROVE VILLAGE, IL 60009-0474
PO BOX 475, ELK GROVE VILLAGE, IL 60009-0475
PO BOX 476, ELK GROVE VILLAGE, IL 60009-0476
PO BOX 477, ELK GROVE VILLAGE, IL 60009-0477
PO BOX 478, ELK GROVE VILLAGE, IL 60009-0478
PO BOX 479, ELK GROVE VILLAGE, IL 60009-0479
PO BOX 480, ELK GROVE VILLAGE, IL 60009-0480
PO BOX 481, ELK GROVE VILLAGE, IL 60009-0481
PO BOX 482, ELK GROVE VILLAGE, IL 60009-0482
PO BOX 483, ELK GROVE VILLAGE, IL 60009-0483
PO BOX 484, ELK GROVE VILLAGE, IL 60009-0484
PO BOX 485, ELK GROVE VILLAGE, IL 60009-0485
PO BOX 486, ELK GROVE VILLAGE, IL 60009-0486
PO BOX 487, ELK GROVE VILLAGE, IL 60009-0487
PO BOX 488, ELK GROVE VILLAGE, IL 60009-0488
PO BOX 489, ELK GROVE VILLAGE, IL 60009-0489
PO BOX 490, ELK GROVE VILLAGE, IL 60009-0490
PO BOX 491, ELK GROVE VILLAGE, IL 60009-0491
PO BOX 492, ELK GROVE VILLAGE, IL 60009-0492
PO BOX 493, ELK GROVE VILLAGE, IL 60009-0493
PO BOX 494, ELK GROVE VILLAGE, IL 60009-0494
PO BOX 495, ELK GROVE VILLAGE, IL 60009-0495
PO BOX 496, ELK GROVE VILLAGE, IL 60009-0496
PO BOX 497, ELK GROVE VILLAGE, IL 60009-0497
PO BOX 498, ELK GROVE VILLAGE, IL 60009-0498
PO BOX 499, ELK GROVE VILLAGE, IL 60009-0499
PO BOX 500, ELK GROVE VILLAGE, IL 60009-0500
PO BOX 501, ELK GROVE VILLAGE, IL 60009-0501
PO BOX 502, ELK GROVE VILLAGE, IL 60009-0502
PO BOX 503, ELK GROVE VILLAGE, IL 60009-0503
PO BOX 504, ELK GROVE VILLAGE, IL 60009-0504
PO BOX 505, ELK GROVE VILLAGE, IL 60009-0505
PO BOX 506, ELK GROVE VILLAGE, IL 60009-0506
PO BOX 507, ELK GROVE VILLAGE, IL 60009-0507
PO BOX 508, ELK GROVE VILLAGE, IL 60009-0508
PO BOX 509, ELK GROVE VILLAGE, IL 60009-0509
PO BOX 510, ELK GROVE VILLAGE, IL 60009-0510
PO BOX 511, ELK GROVE VILLAGE, IL 60009-0511
PO BOX 512, ELK GROVE VILLAGE, IL 60009-0512
PO BOX 513, ELK GROVE VILLAGE, IL 60009-0513
PO BOX 514, ELK GROVE VILLAGE, IL 60009-0514
PO BOX 515, ELK GROVE VILLAGE, IL 60009-0515
PO BOX 516, ELK GROVE VILLAGE, IL 60009-0516
PO BOX 517, ELK GROVE VILLAGE, IL 60009-0517
PO BOX 518, ELK GROVE VILLAGE, IL 60009-0518
PO BOX 519, ELK GROVE VILLAGE, IL 60009-0519
PO BOX 520, ELK GROVE VILLAGE, IL 60009-0520
PO BOX 521, ELK GROVE VILLAGE, IL 60009-0521
PO BOX 522, ELK GROVE VILLAGE, IL 60009-0522
PO BOX 523, ELK GROVE VILLAGE, IL 60009-0523
PO BOX 524, ELK GROVE VILLAGE, IL 60009-0524
PO BOX 525, ELK GROVE VILLAGE, IL 60009-0525
PO BOX 526, ELK GROVE VILLAGE, IL 60009-0526
PO BOX 527, ELK GROVE VILLAGE, IL 60009-0527
PO BOX 528, ELK GROVE VILLAGE, IL 60009-0528
PO BOX 529, ELK GROVE VILLAGE, IL 60009-0529
PO BOX 530, ELK GROVE VILLAGE, IL 60009-0530
PO BOX 531, ELK GROVE VILLAGE, IL 60009-0531
PO BOX 532, ELK GROVE VILLAGE, IL 60009-0532
PO BOX 533, ELK GROVE VILLAGE, IL 60009-0533
PO BOX 534, ELK GROVE VILLAGE, IL 60009-0534
PO BOX 535, ELK GROVE VILLAGE, IL 60009-0535
PO BOX 536, ELK GROVE VILLAGE, IL 60009-0536
PO BOX 537, ELK GROVE VILLAGE, IL 60009-0537
PO BOX 538, ELK GROVE VILLAGE, IL 60009-0538
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