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 540, WATERLOO, IA 50704-0540
PO BOX 541, WATERLOO, IA 50704-0541
PO BOX 542, WATERLOO, IA 50704-0542
PO BOX 543, WATERLOO, IA 50704-0543
PO BOX 544, WATERLOO, IA 50704-0544
PO BOX 545, WATERLOO, IA 50704-0545
PO BOX 546, WATERLOO, IA 50704-0546
PO BOX 547, WATERLOO, IA 50704-0547
PO BOX 548, WATERLOO, IA 50704-0548
PO BOX 549, WATERLOO, IA 50704-0549
PO BOX 550, WATERLOO, IA 50704-0550
PO BOX 551, WATERLOO, IA 50704-0551
PO BOX 552, WATERLOO, IA 50704-0552
PO BOX 553, WATERLOO, IA 50704-0553
PO BOX 554, WATERLOO, IA 50704-0554
PO BOX 555, WATERLOO, IA 50704-0555
PO BOX 556, WATERLOO, IA 50704-0556
PO BOX 557, WATERLOO, IA 50704-0557
PO BOX 558, WATERLOO, IA 50704-0558
PO BOX 559, WATERLOO, IA 50704-0559
PO BOX 560, WATERLOO, IA 50704-0560
PO BOX 561, WATERLOO, IA 50704-0561
PO BOX 562, WATERLOO, IA 50704-0562
PO BOX 563, WATERLOO, IA 50704-0563
PO BOX 564, WATERLOO, IA 50704-0564
PO BOX 565, WATERLOO, IA 50704-0565
PO BOX 566, WATERLOO, IA 50704-0566
PO BOX 567, WATERLOO, IA 50704-0567
PO BOX 568, WATERLOO, IA 50704-0568
PO BOX 569, WATERLOO, IA 50704-0569
PO BOX 570, WATERLOO, IA 50704-0570
PO BOX 571, WATERLOO, IA 50704-0571
PO BOX 572, WATERLOO, IA 50704-0572
PO BOX 573, WATERLOO, IA 50704-0573
PO BOX 574, WATERLOO, IA 50704-0574
PO BOX 575, WATERLOO, IA 50704-0575
PO BOX 576, WATERLOO, IA 50704-0576
PO BOX 577, WATERLOO, IA 50704-0577
PO BOX 578, WATERLOO, IA 50704-0578
PO BOX 579, WATERLOO, IA 50704-0579
PO BOX 580, WATERLOO, IA 50704-0580
PO BOX 581, WATERLOO, IA 50704-0581
PO BOX 582, WATERLOO, IA 50704-0582
PO BOX 583, WATERLOO, IA 50704-0583
PO BOX 584, WATERLOO, IA 50704-0584
PO BOX 585, WATERLOO, IA 50704-0585
PO BOX 586, WATERLOO, IA 50704-0586
PO BOX 587, WATERLOO, IA 50704-0587
PO BOX 588, WATERLOO, IA 50704-0588
PO BOX 589, WATERLOO, IA 50704-0589
PO BOX 590, WATERLOO, IA 50704-0590
PO BOX 591, WATERLOO, IA 50704-0591
PO BOX 592, WATERLOO, IA 50704-0592
PO BOX 593, WATERLOO, IA 50704-0593
PO BOX 594, WATERLOO, IA 50704-0594
PO BOX 595, WATERLOO, IA 50704-0595
PO BOX 596, WATERLOO, IA 50704-0596
PO BOX 597, WATERLOO, IA 50704-0597
PO BOX 598, WATERLOO, IA 50704-0598
PO BOX 599, WATERLOO, IA 50704-0599
PO BOX 600, WATERLOO, IA 50704-0600
PO BOX 601, WATERLOO, IA 50704-0601
PO BOX 602, WATERLOO, IA 50704-0602
PO BOX 603, WATERLOO, IA 50704-0603
PO BOX 604, WATERLOO, IA 50704-0604
PO BOX 605, WATERLOO, IA 50704-0605
PO BOX 606, WATERLOO, IA 50704-0606
PO BOX 607, WATERLOO, IA 50704-0607
PO BOX 608, WATERLOO, IA 50704-0608
PO BOX 609, WATERLOO, IA 50704-0609
PO BOX 610, WATERLOO, IA 50704-0610
PO BOX 611, WATERLOO, IA 50704-0611
PO BOX 612, WATERLOO, IA 50704-0612
PO BOX 613, WATERLOO, IA 50704-0613
PO BOX 614, WATERLOO, IA 50704-0614
PO BOX 615, WATERLOO, IA 50704-0615
PO BOX 616, WATERLOO, IA 50704-0616
PO BOX 617, WATERLOO, IA 50704-0617
PO BOX 618, WATERLOO, IA 50704-0618
PO BOX 619, WATERLOO, IA 50704-0619
PO BOX 620, WATERLOO, IA 50704-0620
PO BOX 621, WATERLOO, IA 50704-0621
PO BOX 622, WATERLOO, IA 50704-0622
PO BOX 623, WATERLOO, IA 50704-0623
PO BOX 624, WATERLOO, IA 50704-0624
PO BOX 625, WATERLOO, IA 50704-0625
PO BOX 626, WATERLOO, IA 50704-0626
PO BOX 627, WATERLOO, IA 50704-0627
PO BOX 628, WATERLOO, IA 50704-0628
PO BOX 629, WATERLOO, IA 50704-0629
PO BOX 630, WATERLOO, IA 50704-0630
PO BOX 631, WATERLOO, IA 50704-0631
PO BOX 632, WATERLOO, IA 50704-0632
PO BOX 633, WATERLOO, IA 50704-0633
PO BOX 634, WATERLOO, IA 50704-0634
PO BOX 635, WATERLOO, IA 50704-0635
PO BOX 636, WATERLOO, IA 50704-0636
PO BOX 637, WATERLOO, IA 50704-0637
PO BOX 638, WATERLOO, IA 50704-0638
PO BOX 639, WATERLOO, IA 50704-0639
PO BOX 640, WATERLOO, IA 50704-0640
PO BOX 641, WATERLOO, IA 50704-0641
PO BOX 642, WATERLOO, IA 50704-0642
PO BOX 643, WATERLOO, IA 50704-0643
PO BOX 644, WATERLOO, IA 50704-0644
PO BOX 645, WATERLOO, IA 50704-0645
PO BOX 646, WATERLOO, IA 50704-0646
PO BOX 647, WATERLOO, IA 50704-0647
PO BOX 648, WATERLOO, IA 50704-0648
PO BOX 649, WATERLOO, IA 50704-0649
PO BOX 650, WATERLOO, IA 50704-0650
PO BOX 651, WATERLOO, IA 50704-0651
PO BOX 652, WATERLOO, IA 50704-0652
PO BOX 653, WATERLOO, IA 50704-0653
PO BOX 654, WATERLOO, IA 50704-0654
PO BOX 655, WATERLOO, IA 50704-0655
PO BOX 656, WATERLOO, IA 50704-0656
PO BOX 657, WATERLOO, IA 50704-0657
PO BOX 658, WATERLOO, IA 50704-0658
PO BOX 659, WATERLOO, IA 50704-0659
PO BOX 660, WATERLOO, IA 50704-0660
PO BOX 661, WATERLOO, IA 50704-0661
PO BOX 662, WATERLOO, IA 50704-0662
PO BOX 663, WATERLOO, IA 50704-0663
PO BOX 664, WATERLOO, IA 50704-0664
PO BOX 665, WATERLOO, IA 50704-0665
PO BOX 666, WATERLOO, IA 50704-0666
PO BOX 667, WATERLOO, IA 50704-0667
PO BOX 668, WATERLOO, IA 50704-0668
PO BOX 669, WATERLOO, IA 50704-0669
PO BOX 670, WATERLOO, IA 50704-0670
PO BOX 671, WATERLOO, IA 50704-0671
PO BOX 672, WATERLOO, IA 50704-0672
PO BOX 673, WATERLOO, IA 50704-0673
PO BOX 674, WATERLOO, IA 50704-0674
PO BOX 675, WATERLOO, IA 50704-0675
PO BOX 676, WATERLOO, IA 50704-0676
PO BOX 677, WATERLOO, IA 50704-0677
PO BOX 678, WATERLOO, IA 50704-0678
PO BOX 679, WATERLOO, IA 50704-0679
PO BOX 680, WATERLOO, IA 50704-0680
PO BOX 681, WATERLOO, IA 50704-0681
PO BOX 682, WATERLOO, IA 50704-0682
PO BOX 683, WATERLOO, IA 50704-0683
PO BOX 684, WATERLOO, IA 50704-0684
PO BOX 685, WATERLOO, IA 50704-0685
PO BOX 686, WATERLOO, IA 50704-0686
PO BOX 687, WATERLOO, IA 50704-0687
PO BOX 688, WATERLOO, IA 50704-0688
PO BOX 689, WATERLOO, IA 50704-0689
PO BOX 690, WATERLOO, IA 50704-0690
PO BOX 691, WATERLOO, IA 50704-0691
PO BOX 692, WATERLOO, IA 50704-0692
PO BOX 693, WATERLOO, IA 50704-0693
PO BOX 694, WATERLOO, IA 50704-0694
PO BOX 695, WATERLOO, IA 50704-0695
PO BOX 696, WATERLOO, IA 50704-0696
PO BOX 697, WATERLOO, IA 50704-0697
PO BOX 698, WATERLOO, IA 50704-0698
PO BOX 699, WATERLOO, IA 50704-0699
PO BOX 700, WATERLOO, IA 50704-0700
PO BOX 701, WATERLOO, IA 50704-0701
PO BOX 702, WATERLOO, IA 50704-0702
PO BOX 703, WATERLOO, IA 50704-0703
PO BOX 704, WATERLOO, IA 50704-0704
PO BOX 705, WATERLOO, IA 50704-0705
PO BOX 706, WATERLOO, IA 50704-0706
PO BOX 707, WATERLOO, IA 50704-0707
PO BOX 708, WATERLOO, IA 50704-0708
PO BOX 709, WATERLOO, IA 50704-0709
PO BOX 710, WATERLOO, IA 50704-0710
PO BOX 711, WATERLOO, IA 50704-0711
PO BOX 712, WATERLOO, IA 50704-0712
PO BOX 713, WATERLOO, IA 50704-0713
PO BOX 714, WATERLOO, IA 50704-0714
PO BOX 715, WATERLOO, IA 50704-0715
PO BOX 716, WATERLOO, IA 50704-0716
PO BOX 717, WATERLOO, IA 50704-0717
PO BOX 718, WATERLOO, IA 50704-0718
PO BOX 719, WATERLOO, IA 50704-0719
PO BOX 720, WATERLOO, IA 50704-0720
PO BOX 721, WATERLOO, IA 50704-0721
PO BOX 722, WATERLOO, IA 50704-0722
PO BOX 723, WATERLOO, IA 50704-0723
PO BOX 724, WATERLOO, IA 50704-0724
PO BOX 725, WATERLOO, IA 50704-0725
PO BOX 726, WATERLOO, IA 50704-0726
PO BOX 727, WATERLOO, IA 50704-0727
PO BOX 728, WATERLOO, IA 50704-0728
PO BOX 729, WATERLOO, IA 50704-0729
PO BOX 730, WATERLOO, IA 50704-0730
PO BOX 731, WATERLOO, IA 50704-0731
PO BOX 732, WATERLOO, IA 50704-0732
PO BOX 733, WATERLOO, IA 50704-0733
PO BOX 734, WATERLOO, IA 50704-0734
PO BOX 735, WATERLOO, IA 50704-0735
PO BOX 736, WATERLOO, IA 50704-0736
PO BOX 737, WATERLOO, IA 50704-0737
PO BOX 738, WATERLOO, IA 50704-0738
PO BOX 739, WATERLOO, IA 50704-0739
PO BOX 740, WATERLOO, IA 50704-0740
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