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 481, SOUTH BELOIT, IL 61080-0481
PO BOX 482, SOUTH BELOIT, IL 61080-0482
PO BOX 483, SOUTH BELOIT, IL 61080-0483
PO BOX 484, SOUTH BELOIT, IL 61080-0484
PO BOX 485, SOUTH BELOIT, IL 61080-0485
PO BOX 486, SOUTH BELOIT, IL 61080-0486
PO BOX 487, SOUTH BELOIT, IL 61080-0487
PO BOX 488, SOUTH BELOIT, IL 61080-0488
PO BOX 489, SOUTH BELOIT, IL 61080-0489
PO BOX 490, SOUTH BELOIT, IL 61080-0490
PO BOX 491, SOUTH BELOIT, IL 61080-0491
PO BOX 492, SOUTH BELOIT, IL 61080-0492
PO BOX 493, SOUTH BELOIT, IL 61080-0493
PO BOX 494, SOUTH BELOIT, IL 61080-0494
PO BOX 495, SOUTH BELOIT, IL 61080-0495
PO BOX 496, SOUTH BELOIT, IL 61080-0496
PO BOX 497, SOUTH BELOIT, IL 61080-0497
PO BOX 498, SOUTH BELOIT, IL 61080-0498
PO BOX 499, SOUTH BELOIT, IL 61080-0499
PO BOX 500, SOUTH BELOIT, IL 61080-0500
PO BOX 501, SOUTH BELOIT, IL 61080-0501
PO BOX 502, SOUTH BELOIT, IL 61080-0502
PO BOX 503, SOUTH BELOIT, IL 61080-0503
PO BOX 504, SOUTH BELOIT, IL 61080-0504
PO BOX 505, SOUTH BELOIT, IL 61080-0505
PO BOX 506, SOUTH BELOIT, IL 61080-0506
PO BOX 507, SOUTH BELOIT, IL 61080-0507
PO BOX 508, SOUTH BELOIT, IL 61080-0508
PO BOX 509, SOUTH BELOIT, IL 61080-0509
PO BOX 510, SOUTH BELOIT, IL 61080-0510
PO BOX 511, SOUTH BELOIT, IL 61080-0511
PO BOX 512, SOUTH BELOIT, IL 61080-0512
PO BOX 513, SOUTH BELOIT, IL 61080-0513
PO BOX 514, SOUTH BELOIT, IL 61080-0514
PO BOX 515, SOUTH BELOIT, IL 61080-0515
PO BOX 516, SOUTH BELOIT, IL 61080-0516
PO BOX 517, SOUTH BELOIT, IL 61080-0517
PO BOX 518, SOUTH BELOIT, IL 61080-0518
PO BOX 519, SOUTH BELOIT, IL 61080-0519
PO BOX 520, SOUTH BELOIT, IL 61080-0520
PO BOX 521, SOUTH BELOIT, IL 61080-0521
PO BOX 522, SOUTH BELOIT, IL 61080-0522
PO BOX 523, SOUTH BELOIT, IL 61080-0523
PO BOX 524, SOUTH BELOIT, IL 61080-0524
PO BOX 525, SOUTH BELOIT, IL 61080-0525
PO BOX 526, SOUTH BELOIT, IL 61080-0526
PO BOX 527, SOUTH BELOIT, IL 61080-0527
PO BOX 528, SOUTH BELOIT, IL 61080-0528
PO BOX 529, SOUTH BELOIT, IL 61080-0529
PO BOX 530, SOUTH BELOIT, IL 61080-0530
PO BOX 531, SOUTH BELOIT, IL 61080-0531
PO BOX 532, SOUTH BELOIT, IL 61080-0532
PO BOX 533, SOUTH BELOIT, IL 61080-0533
PO BOX 534, SOUTH BELOIT, IL 61080-0534
PO BOX 535, SOUTH BELOIT, IL 61080-0535
PO BOX 536, SOUTH BELOIT, IL 61080-0536
PO BOX 537, SOUTH BELOIT, IL 61080-0537
PO BOX 538, SOUTH BELOIT, IL 61080-0538
PO BOX 539, SOUTH BELOIT, IL 61080-0539
PO BOX 540, SOUTH BELOIT, IL 61080-0540
PO BOX 541, SOUTH BELOIT, IL 61080-0541
PO BOX 542, SOUTH BELOIT, IL 61080-0542
PO BOX 543, SOUTH BELOIT, IL 61080-0543
PO BOX 544, SOUTH BELOIT, IL 61080-0544
PO BOX 545, SOUTH BELOIT, IL 61080-0545
PO BOX 546, SOUTH BELOIT, IL 61080-0546
PO BOX 547, SOUTH BELOIT, IL 61080-0547
PO BOX 548, SOUTH BELOIT, IL 61080-0548
PO BOX 549, SOUTH BELOIT, IL 61080-0549
PO BOX 550, SOUTH BELOIT, IL 61080-0550
PO BOX 551, SOUTH BELOIT, IL 61080-0551
PO BOX 552, SOUTH BELOIT, IL 61080-0552
PO BOX 553, SOUTH BELOIT, IL 61080-0553
PO BOX 554, SOUTH BELOIT, IL 61080-0554
PO BOX 555, SOUTH BELOIT, IL 61080-0555
PO BOX 556, SOUTH BELOIT, IL 61080-0556
PO BOX 557, SOUTH BELOIT, IL 61080-0557
PO BOX 558, SOUTH BELOIT, IL 61080-0558
PO BOX 559, SOUTH BELOIT, IL 61080-0559
PO BOX 560, SOUTH BELOIT, IL 61080-0560
PO BOX 561, SOUTH BELOIT, IL 61080-0561
PO BOX 562, SOUTH BELOIT, IL 61080-0562
PO BOX 563, SOUTH BELOIT, IL 61080-0563
PO BOX 564, SOUTH BELOIT, IL 61080-0564
PO BOX 565, SOUTH BELOIT, IL 61080-0565
PO BOX 566, SOUTH BELOIT, IL 61080-0566
PO BOX 567, SOUTH BELOIT, IL 61080-0567
PO BOX 568, SOUTH BELOIT, IL 61080-0568
PO BOX 569, SOUTH BELOIT, IL 61080-0569
PO BOX 570, SOUTH BELOIT, IL 61080-0570
PO BOX 571, SOUTH BELOIT, IL 61080-0571
PO BOX 572, SOUTH BELOIT, IL 61080-0572
PO BOX 573, SOUTH BELOIT, IL 61080-0573
PO BOX 574, SOUTH BELOIT, IL 61080-0574
PO BOX 575, SOUTH BELOIT, IL 61080-0575
PO BOX 576, SOUTH BELOIT, IL 61080-0576
PO BOX 577, SOUTH BELOIT, IL 61080-0577
PO BOX 578, SOUTH BELOIT, IL 61080-0578
PO BOX 579, SOUTH BELOIT, IL 61080-0579
PO BOX 580, SOUTH BELOIT, IL 61080-0580
PO BOX 581, SOUTH BELOIT, IL 61080-0581
PO BOX 582, SOUTH BELOIT, IL 61080-0582
PO BOX 583, SOUTH BELOIT, IL 61080-0583
PO BOX 584, SOUTH BELOIT, IL 61080-0584
PO BOX 585, SOUTH BELOIT, IL 61080-0585
PO BOX 586, SOUTH BELOIT, IL 61080-0586
PO BOX 587, SOUTH BELOIT, IL 61080-0587
PO BOX 588, SOUTH BELOIT, IL 61080-0588
PO BOX 589, SOUTH BELOIT, IL 61080-0589
PO BOX 590, SOUTH BELOIT, IL 61080-0590
PO BOX 591, SOUTH BELOIT, IL 61080-0591
PO BOX 592, SOUTH BELOIT, IL 61080-0592
PO BOX 593, SOUTH BELOIT, IL 61080-0593
PO BOX 594, SOUTH BELOIT, IL 61080-0594
PO BOX 595, SOUTH BELOIT, IL 61080-0595
PO BOX 596, SOUTH BELOIT, IL 61080-0596
PO BOX 597, SOUTH BELOIT, IL 61080-0597
PO BOX 598, SOUTH BELOIT, IL 61080-0598
PO BOX 599, SOUTH BELOIT, IL 61080-0599
PO BOX 600, SOUTH BELOIT, IL 61080-0600
PO BOX 601, SOUTH BELOIT, IL 61080-0601
PO BOX 602, SOUTH BELOIT, IL 61080-0602
PO BOX 603, SOUTH BELOIT, IL 61080-0603
PO BOX 604, SOUTH BELOIT, IL 61080-0604
PO BOX 605, SOUTH BELOIT, IL 61080-0605
PO BOX 606, SOUTH BELOIT, IL 61080-0606
PO BOX 607, SOUTH BELOIT, IL 61080-0607
PO BOX 608, SOUTH BELOIT, IL 61080-0608
PO BOX 609, SOUTH BELOIT, IL 61080-0609
PO BOX 610, SOUTH BELOIT, IL 61080-0610
PO BOX 611, SOUTH BELOIT, IL 61080-0611
PO BOX 612, SOUTH BELOIT, IL 61080-0612
PO BOX 613, SOUTH BELOIT, IL 61080-0613
PO BOX 614, SOUTH BELOIT, IL 61080-0614
PO BOX 615, SOUTH BELOIT, IL 61080-0615
PO BOX 616, SOUTH BELOIT, IL 61080-0616
PO BOX 617, SOUTH BELOIT, IL 61080-0617
PO BOX 618, SOUTH BELOIT, IL 61080-0618
PO BOX 619, SOUTH BELOIT, IL 61080-0619
PO BOX 620, SOUTH BELOIT, IL 61080-0620
PO BOX 621, SOUTH BELOIT, IL 61080-0621
PO BOX 622, SOUTH BELOIT, IL 61080-0622
PO BOX 623, SOUTH BELOIT, IL 61080-0623
PO BOX 624, SOUTH BELOIT, IL 61080-0624
PO BOX 625, SOUTH BELOIT, IL 61080-0625
PO BOX 626, SOUTH BELOIT, IL 61080-0626
PO BOX 627, SOUTH BELOIT, IL 61080-0627
PO BOX 628, SOUTH BELOIT, IL 61080-0628
PO BOX 629, SOUTH BELOIT, IL 61080-0629
PO BOX 630, SOUTH BELOIT, IL 61080-0630
PO BOX 631, SOUTH BELOIT, IL 61080-0631
PO BOX 632, SOUTH BELOIT, IL 61080-0632
PO BOX 633, SOUTH BELOIT, IL 61080-0633
PO BOX 634, SOUTH BELOIT, IL 61080-0634
PO BOX 635, SOUTH BELOIT, IL 61080-0635
PO BOX 636, SOUTH BELOIT, IL 61080-0636
PO BOX 637, SOUTH BELOIT, IL 61080-0637
PO BOX 638, SOUTH BELOIT, IL 61080-0638
PO BOX 639, SOUTH BELOIT, IL 61080-0639
PO BOX 640, SOUTH BELOIT, IL 61080-0640
PO BOX 641, SOUTH BELOIT, IL 61080-0641
PO BOX 642, SOUTH BELOIT, IL 61080-0642
PO BOX 643, SOUTH BELOIT, IL 61080-0643
PO BOX 644, SOUTH BELOIT, IL 61080-0644
PO BOX 645, SOUTH BELOIT, IL 61080-0645
PO BOX 646, SOUTH BELOIT, IL 61080-0646
PO BOX 647, SOUTH BELOIT, IL 61080-0647
PO BOX 648, SOUTH BELOIT, IL 61080-0648
PO BOX 649, SOUTH BELOIT, IL 61080-0649
PO BOX 650, SOUTH BELOIT, IL 61080-0650
PO BOX 651, SOUTH BELOIT, IL 61080-0651
PO BOX 652, SOUTH BELOIT, IL 61080-0652
PO BOX 653, SOUTH BELOIT, IL 61080-0653
PO BOX 654, SOUTH BELOIT, IL 61080-0654
PO BOX 655, SOUTH BELOIT, IL 61080-0655
PO BOX 656, SOUTH BELOIT, IL 61080-0656
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