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 WEST CITY, MO 64863-0481
PO BOX 482, SOUTH WEST CITY, MO 64863-0482
PO BOX 483, SOUTH WEST CITY, MO 64863-0483
PO BOX 484, SOUTH WEST CITY, MO 64863-0484
PO BOX 485, SOUTH WEST CITY, MO 64863-0485
PO BOX 486, SOUTH WEST CITY, MO 64863-0486
PO BOX 487, SOUTH WEST CITY, MO 64863-0487
PO BOX 488, SOUTH WEST CITY, MO 64863-0488
PO BOX 489, SOUTH WEST CITY, MO 64863-0489
PO BOX 490, SOUTH WEST CITY, MO 64863-0490
PO BOX 491, SOUTH WEST CITY, MO 64863-0491
PO BOX 492, SOUTH WEST CITY, MO 64863-0492
PO BOX 493, SOUTH WEST CITY, MO 64863-0493
PO BOX 494, SOUTH WEST CITY, MO 64863-0494
PO BOX 495, SOUTH WEST CITY, MO 64863-0495
PO BOX 496, SOUTH WEST CITY, MO 64863-0496
PO BOX 497, SOUTH WEST CITY, MO 64863-0497
PO BOX 498, SOUTH WEST CITY, MO 64863-0498
PO BOX 499, SOUTH WEST CITY, MO 64863-0499
PO BOX 500, SOUTH WEST CITY, MO 64863-0500
PO BOX 501, SOUTH WEST CITY, MO 64863-0501
PO BOX 502, SOUTH WEST CITY, MO 64863-0502
PO BOX 503, SOUTH WEST CITY, MO 64863-0503
PO BOX 504, SOUTH WEST CITY, MO 64863-0504
PO BOX 505, SOUTH WEST CITY, MO 64863-0505
PO BOX 506, SOUTH WEST CITY, MO 64863-0506
PO BOX 507, SOUTH WEST CITY, MO 64863-0507
PO BOX 508, SOUTH WEST CITY, MO 64863-0508
PO BOX 509, SOUTH WEST CITY, MO 64863-0509
PO BOX 510, SOUTH WEST CITY, MO 64863-0510
PO BOX 511, SOUTH WEST CITY, MO 64863-0511
PO BOX 512, SOUTH WEST CITY, MO 64863-0512
PO BOX 513, SOUTH WEST CITY, MO 64863-0513
PO BOX 514, SOUTH WEST CITY, MO 64863-0514
PO BOX 515, SOUTH WEST CITY, MO 64863-0515
PO BOX 516, SOUTH WEST CITY, MO 64863-0516
PO BOX 517, SOUTH WEST CITY, MO 64863-0517
PO BOX 518, SOUTH WEST CITY, MO 64863-0518
PO BOX 519, SOUTH WEST CITY, MO 64863-0519
PO BOX 520, SOUTH WEST CITY, MO 64863-0520
PO BOX 521, SOUTH WEST CITY, MO 64863-0521
PO BOX 522, SOUTH WEST CITY, MO 64863-0522
PO BOX 523, SOUTH WEST CITY, MO 64863-0523
PO BOX 524, SOUTH WEST CITY, MO 64863-0524
PO BOX 525, SOUTH WEST CITY, MO 64863-0525
PO BOX 526, SOUTH WEST CITY, MO 64863-0526
PO BOX 527, SOUTH WEST CITY, MO 64863-0527
PO BOX 528, SOUTH WEST CITY, MO 64863-0528
PO BOX 529, SOUTH WEST CITY, MO 64863-0529
PO BOX 530, SOUTH WEST CITY, MO 64863-0530
PO BOX 531, SOUTH WEST CITY, MO 64863-0531
PO BOX 532, SOUTH WEST CITY, MO 64863-0532
PO BOX 533, SOUTH WEST CITY, MO 64863-0533
PO BOX 534, SOUTH WEST CITY, MO 64863-0534
PO BOX 535, SOUTH WEST CITY, MO 64863-0535
PO BOX 536, SOUTH WEST CITY, MO 64863-0536
PO BOX 537, SOUTH WEST CITY, MO 64863-0537
PO BOX 538, SOUTH WEST CITY, MO 64863-0538
PO BOX 539, SOUTH WEST CITY, MO 64863-0539
PO BOX 540, SOUTH WEST CITY, MO 64863-0540
PO BOX 541, SOUTH WEST CITY, MO 64863-0541
PO BOX 542, SOUTH WEST CITY, MO 64863-0542
PO BOX 543, SOUTH WEST CITY, MO 64863-0543
PO BOX 544, SOUTH WEST CITY, MO 64863-0544
PO BOX 545, SOUTH WEST CITY, MO 64863-0545
PO BOX 546, SOUTH WEST CITY, MO 64863-0546
PO BOX 547, SOUTH WEST CITY, MO 64863-0547
PO BOX 548, SOUTH WEST CITY, MO 64863-0548
PO BOX 549, SOUTH WEST CITY, MO 64863-0549
PO BOX 550, SOUTH WEST CITY, MO 64863-0550
PO BOX 551, SOUTH WEST CITY, MO 64863-0551
PO BOX 552, SOUTH WEST CITY, MO 64863-0552
PO BOX 553, SOUTH WEST CITY, MO 64863-0553
PO BOX 554, SOUTH WEST CITY, MO 64863-0554
PO BOX 555, SOUTH WEST CITY, MO 64863-0555
PO BOX 556, SOUTH WEST CITY, MO 64863-0556
PO BOX 557, SOUTH WEST CITY, MO 64863-0557
PO BOX 558, SOUTH WEST CITY, MO 64863-0558
PO BOX 559, SOUTH WEST CITY, MO 64863-0559
PO BOX 560, SOUTH WEST CITY, MO 64863-0560
PO BOX 561, SOUTH WEST CITY, MO 64863-0561
PO BOX 562, SOUTH WEST CITY, MO 64863-0562
PO BOX 563, SOUTH WEST CITY, MO 64863-0563
PO BOX 564, SOUTH WEST CITY, MO 64863-0564
PO BOX 565, SOUTH WEST CITY, MO 64863-0565
PO BOX 566, SOUTH WEST CITY, MO 64863-0566
PO BOX 567, SOUTH WEST CITY, MO 64863-0567
PO BOX 568, SOUTH WEST CITY, MO 64863-0568
PO BOX 569, SOUTH WEST CITY, MO 64863-0569
PO BOX 570, SOUTH WEST CITY, MO 64863-0570
PO BOX 571, SOUTH WEST CITY, MO 64863-0571
PO BOX 572, SOUTH WEST CITY, MO 64863-0572
PO BOX 573, SOUTH WEST CITY, MO 64863-0573
PO BOX 574, SOUTH WEST CITY, MO 64863-0574
PO BOX 575, SOUTH WEST CITY, MO 64863-0575
PO BOX 576, SOUTH WEST CITY, MO 64863-0576
PO BOX 577, SOUTH WEST CITY, MO 64863-0577
PO BOX 578, SOUTH WEST CITY, MO 64863-0578
PO BOX 579, SOUTH WEST CITY, MO 64863-0579
PO BOX 580, SOUTH WEST CITY, MO 64863-0580
PO BOX 581, SOUTH WEST CITY, MO 64863-0581
PO BOX 582, SOUTH WEST CITY, MO 64863-0582
PO BOX 583, SOUTH WEST CITY, MO 64863-0583
PO BOX 584, SOUTH WEST CITY, MO 64863-0584
PO BOX 585, SOUTH WEST CITY, MO 64863-0585
PO BOX 586, SOUTH WEST CITY, MO 64863-0586
PO BOX 587, SOUTH WEST CITY, MO 64863-0587
PO BOX 588, SOUTH WEST CITY, MO 64863-0588
PO BOX 589, SOUTH WEST CITY, MO 64863-0589
PO BOX 590, SOUTH WEST CITY, MO 64863-0590
PO BOX 591, SOUTH WEST CITY, MO 64863-0591
PO BOX 592, SOUTH WEST CITY, MO 64863-0592
PO BOX 593, SOUTH WEST CITY, MO 64863-0593
PO BOX 594, SOUTH WEST CITY, MO 64863-0594
PO BOX 595, SOUTH WEST CITY, MO 64863-0595
PO BOX 596, SOUTH WEST CITY, MO 64863-0596
PO BOX 597, SOUTH WEST CITY, MO 64863-0597
PO BOX 598, SOUTH WEST CITY, MO 64863-0598
PO BOX 599, SOUTH WEST CITY, MO 64863-0599
PO BOX 600, SOUTH WEST CITY, MO 64863-0600
PO BOX 601, SOUTH WEST CITY, MO 64863-0601
PO BOX 602, SOUTH WEST CITY, MO 64863-0602
PO BOX 603, SOUTH WEST CITY, MO 64863-0603
PO BOX 604, SOUTH WEST CITY, MO 64863-0604
PO BOX 605, SOUTH WEST CITY, MO 64863-0605
PO BOX 606, SOUTH WEST CITY, MO 64863-0606
PO BOX 607, SOUTH WEST CITY, MO 64863-0607
PO BOX 608, SOUTH WEST CITY, MO 64863-0608
PO BOX 609, SOUTH WEST CITY, MO 64863-0609
PO BOX 610, SOUTH WEST CITY, MO 64863-0610
PO BOX 611, SOUTH WEST CITY, MO 64863-0611
PO BOX 612, SOUTH WEST CITY, MO 64863-0612
PO BOX 613, SOUTH WEST CITY, MO 64863-0613
PO BOX 614, SOUTH WEST CITY, MO 64863-0614
PO BOX 615, SOUTH WEST CITY, MO 64863-0615
PO BOX 616, SOUTH WEST CITY, MO 64863-0616
PO BOX 617, SOUTH WEST CITY, MO 64863-0617
PO BOX 618, SOUTH WEST CITY, MO 64863-0618
PO BOX 619, SOUTH WEST CITY, MO 64863-0619
PO BOX 620, SOUTH WEST CITY, MO 64863-0620
PO BOX 621, SOUTH WEST CITY, MO 64863-0621
PO BOX 622, SOUTH WEST CITY, MO 64863-0622
PO BOX 623, SOUTH WEST CITY, MO 64863-0623
PO BOX 624, SOUTH WEST CITY, MO 64863-0624
PO BOX 625, SOUTH WEST CITY, MO 64863-0625
PO BOX 626, SOUTH WEST CITY, MO 64863-0626
PO BOX 627, SOUTH WEST CITY, MO 64863-0627
PO BOX 628, SOUTH WEST CITY, MO 64863-0628
PO BOX 629, SOUTH WEST CITY, MO 64863-0629
PO BOX 630, SOUTH WEST CITY, MO 64863-0630
PO BOX 631, SOUTH WEST CITY, MO 64863-0631
PO BOX 632, SOUTH WEST CITY, MO 64863-0632
PO BOX 633, SOUTH WEST CITY, MO 64863-0633
PO BOX 634, SOUTH WEST CITY, MO 64863-0634
PO BOX 635, SOUTH WEST CITY, MO 64863-0635
PO BOX 636, SOUTH WEST CITY, MO 64863-0636
PO BOX 637, SOUTH WEST CITY, MO 64863-0637
PO BOX 638, SOUTH WEST CITY, MO 64863-0638
PO BOX 639, SOUTH WEST CITY, MO 64863-0639
PO BOX 640, SOUTH WEST CITY, MO 64863-0640
PO BOX 641, SOUTH WEST CITY, MO 64863-0641
PO BOX 642, SOUTH WEST CITY, MO 64863-0642
PO BOX 643, SOUTH WEST CITY, MO 64863-0643
PO BOX 644, SOUTH WEST CITY, MO 64863-0644
PO BOX 645, SOUTH WEST CITY, MO 64863-0645
PO BOX 646, SOUTH WEST CITY, MO 64863-0646
PO BOX 647, SOUTH WEST CITY, MO 64863-0647
PO BOX 648, SOUTH WEST CITY, MO 64863-0648
PO BOX 649, SOUTH WEST CITY, MO 64863-0649
PO BOX 650, SOUTH WEST CITY, MO 64863-0650
PO BOX 651, SOUTH WEST CITY, MO 64863-0651
PO BOX 652, SOUTH WEST CITY, MO 64863-0652
PO BOX 653, SOUTH WEST CITY, MO 64863-0653
PO BOX 654, SOUTH WEST CITY, MO 64863-0654
PO BOX 655, SOUTH WEST CITY, MO 64863-0655
PO BOX 656, SOUTH WEST CITY, MO 64863-0656
PO BOX 657, SOUTH WEST CITY, MO 64863-0657
PO BOX 658, SOUTH WEST CITY, MO 64863-0658
PO BOX 659, SOUTH WEST CITY, MO 64863-0659
PO BOX 660, SOUTH WEST CITY, MO 64863-0660
PO BOX 661, SOUTH WEST CITY, MO 64863-0661
PO BOX 662, SOUTH WEST CITY, MO 64863-0662
PO BOX 663, SOUTH WEST CITY, MO 64863-0663
PO BOX 664, SOUTH WEST CITY, MO 64863-0664
PO BOX 665, SOUTH WEST CITY, MO 64863-0665
PO BOX 666, SOUTH WEST CITY, MO 64863-0666
PO BOX 667, SOUTH WEST CITY, MO 64863-0667
PO BOX 668, SOUTH WEST CITY, MO 64863-0668
PO BOX 669, SOUTH WEST CITY, MO 64863-0669
PO BOX 670, SOUTH WEST CITY, MO 64863-0670
PO BOX 671, SOUTH WEST CITY, MO 64863-0671
PO BOX 672, SOUTH WEST CITY, MO 64863-0672
PO BOX 673, SOUTH WEST CITY, MO 64863-0673
PO BOX 674, SOUTH WEST CITY, MO 64863-0674
PO BOX 675, SOUTH WEST CITY, MO 64863-0675
PO BOX 676, SOUTH WEST CITY, MO 64863-0676
PO BOX 677, SOUTH WEST CITY, MO 64863-0677
PO BOX 678, SOUTH WEST CITY, MO 64863-0678
PO BOX 679, SOUTH WEST CITY, MO 64863-0679
PO BOX 680, SOUTH WEST CITY, MO 64863-0680
PO BOX 681, SOUTH WEST CITY, MO 64863-0681
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