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 601, BISMARCK, ND 58502-0601
PO BOX 602, BISMARCK, ND 58502-0602
PO BOX 603, BISMARCK, ND 58502-0603
PO BOX 604, BISMARCK, ND 58502-0604
PO BOX 605, BISMARCK, ND 58502-0605
PO BOX 606, BISMARCK, ND 58502-0606
PO BOX 607, BISMARCK, ND 58502-0607
PO BOX 608, BISMARCK, ND 58502-0608
PO BOX 609, BISMARCK, ND 58502-0609
PO BOX 610, BISMARCK, ND 58502-0610
PO BOX 611, BISMARCK, ND 58502-0611
PO BOX 612, BISMARCK, ND 58502-0612
PO BOX 613, BISMARCK, ND 58502-0613
PO BOX 614, BISMARCK, ND 58502-0614
PO BOX 615, BISMARCK, ND 58502-0615
PO BOX 616, BISMARCK, ND 58502-0616
PO BOX 617, BISMARCK, ND 58502-0617
PO BOX 618, BISMARCK, ND 58502-0618
PO BOX 619, BISMARCK, ND 58502-0619
PO BOX 620, BISMARCK, ND 58502-0620
PO BOX 621, BISMARCK, ND 58502-0621
PO BOX 622, BISMARCK, ND 58502-0622
PO BOX 623, BISMARCK, ND 58502-0623
PO BOX 624, BISMARCK, ND 58502-0624
PO BOX 625, BISMARCK, ND 58502-0625
PO BOX 626, BISMARCK, ND 58502-0626
PO BOX 627, BISMARCK, ND 58502-0627
PO BOX 628, BISMARCK, ND 58502-0628
PO BOX 629, BISMARCK, ND 58502-0629
PO BOX 630, BISMARCK, ND 58502-0630
PO BOX 631, BISMARCK, ND 58502-0631
PO BOX 632, BISMARCK, ND 58502-0632
PO BOX 633, BISMARCK, ND 58502-0633
PO BOX 634, BISMARCK, ND 58502-0634
PO BOX 635, BISMARCK, ND 58502-0635
PO BOX 636, BISMARCK, ND 58502-0636
PO BOX 637, BISMARCK, ND 58502-0637
PO BOX 638, BISMARCK, ND 58502-0638
PO BOX 639, BISMARCK, ND 58502-0639
PO BOX 640, BISMARCK, ND 58502-0640
PO BOX 641, BISMARCK, ND 58502-0641
PO BOX 642, BISMARCK, ND 58502-0642
PO BOX 643, BISMARCK, ND 58502-0643
PO BOX 644, BISMARCK, ND 58502-0644
PO BOX 645, BISMARCK, ND 58502-0645
PO BOX 646, BISMARCK, ND 58502-0646
PO BOX 647, BISMARCK, ND 58502-0647
PO BOX 648, BISMARCK, ND 58502-0648
PO BOX 649, BISMARCK, ND 58502-0649
PO BOX 650, BISMARCK, ND 58502-0650
PO BOX 651, BISMARCK, ND 58502-0651
PO BOX 652, BISMARCK, ND 58502-0652
PO BOX 653, BISMARCK, ND 58502-0653
PO BOX 654, BISMARCK, ND 58502-0654
PO BOX 655, BISMARCK, ND 58502-0655
PO BOX 656, BISMARCK, ND 58502-0656
PO BOX 657, BISMARCK, ND 58502-0657
PO BOX 658, BISMARCK, ND 58502-0658
PO BOX 659, BISMARCK, ND 58502-0659
PO BOX 660, BISMARCK, ND 58502-0660
PO BOX 661, BISMARCK, ND 58502-0661
PO BOX 662, BISMARCK, ND 58502-0662
PO BOX 663, BISMARCK, ND 58502-0663
PO BOX 664, BISMARCK, ND 58502-0664
PO BOX 665, BISMARCK, ND 58502-0665
PO BOX 666, BISMARCK, ND 58502-0666
PO BOX 667, BISMARCK, ND 58502-0667
PO BOX 668, BISMARCK, ND 58502-0668
PO BOX 669, BISMARCK, ND 58502-0669
PO BOX 670, BISMARCK, ND 58502-0670
PO BOX 671, BISMARCK, ND 58502-0671
PO BOX 672, BISMARCK, ND 58502-0672
PO BOX 673, BISMARCK, ND 58502-0673
PO BOX 674, BISMARCK, ND 58502-0674
PO BOX 675, BISMARCK, ND 58502-0675
PO BOX 676, BISMARCK, ND 58502-0676
PO BOX 677, BISMARCK, ND 58502-0677
PO BOX 678, BISMARCK, ND 58502-0678
PO BOX 679, BISMARCK, ND 58502-0679
PO BOX 680, BISMARCK, ND 58502-0680
PO BOX 681, BISMARCK, ND 58502-0681
PO BOX 682, BISMARCK, ND 58502-0682
PO BOX 683, BISMARCK, ND 58502-0683
PO BOX 684, BISMARCK, ND 58502-0684
PO BOX 685, BISMARCK, ND 58502-0685
PO BOX 686, BISMARCK, ND 58502-0686
PO BOX 687, BISMARCK, ND 58502-0687
PO BOX 688, BISMARCK, ND 58502-0688
PO BOX 689, BISMARCK, ND 58502-0689
PO BOX 690, BISMARCK, ND 58502-0690
PO BOX 691, BISMARCK, ND 58502-0691
PO BOX 692, BISMARCK, ND 58502-0692
PO BOX 693, BISMARCK, ND 58502-0693
PO BOX 694, BISMARCK, ND 58502-0694
PO BOX 695, BISMARCK, ND 58502-0695
PO BOX 696, BISMARCK, ND 58502-0696
PO BOX 697, BISMARCK, ND 58502-0697
PO BOX 698, BISMARCK, ND 58502-0698
PO BOX 699, BISMARCK, ND 58502-0699
PO BOX 700, BISMARCK, ND 58502-0700
PO BOX 701, BISMARCK, ND 58502-0701
PO BOX 702, BISMARCK, ND 58502-0702
PO BOX 703, BISMARCK, ND 58502-0703
PO BOX 704, BISMARCK, ND 58502-0704
PO BOX 705, BISMARCK, ND 58502-0705
PO BOX 706, BISMARCK, ND 58502-0706
PO BOX 707, BISMARCK, ND 58502-0707
PO BOX 708, BISMARCK, ND 58502-0708
PO BOX 709, BISMARCK, ND 58502-0709
PO BOX 710, BISMARCK, ND 58502-0710
PO BOX 711, BISMARCK, ND 58502-0711
PO BOX 712, BISMARCK, ND 58502-0712
PO BOX 713, BISMARCK, ND 58502-0713
PO BOX 714, BISMARCK, ND 58502-0714
PO BOX 715, BISMARCK, ND 58502-0715
PO BOX 716, BISMARCK, ND 58502-0716
PO BOX 717, BISMARCK, ND 58502-0717
PO BOX 718, BISMARCK, ND 58502-0718
PO BOX 719, BISMARCK, ND 58502-0719
PO BOX 720, BISMARCK, ND 58502-0720
PO BOX 721, BISMARCK, ND 58502-0721
PO BOX 722, BISMARCK, ND 58502-0722
PO BOX 723, BISMARCK, ND 58502-0723
PO BOX 724, BISMARCK, ND 58502-0724
PO BOX 725, BISMARCK, ND 58502-0725
PO BOX 726, BISMARCK, ND 58502-0726
PO BOX 727, BISMARCK, ND 58502-0727
PO BOX 728, BISMARCK, ND 58502-0728
PO BOX 729, BISMARCK, ND 58502-0729
PO BOX 730, BISMARCK, ND 58502-0730
PO BOX 731, BISMARCK, ND 58502-0731
PO BOX 732, BISMARCK, ND 58502-0732
PO BOX 733, BISMARCK, ND 58502-0733
PO BOX 734, BISMARCK, ND 58502-0734
PO BOX 735, BISMARCK, ND 58502-0735
PO BOX 736, BISMARCK, ND 58502-0736
PO BOX 737, BISMARCK, ND 58502-0737
PO BOX 738, BISMARCK, ND 58502-0738
PO BOX 739, BISMARCK, ND 58502-0739
PO BOX 740, BISMARCK, ND 58502-0740
PO BOX 741, BISMARCK, ND 58502-0741
PO BOX 742, BISMARCK, ND 58502-0742
PO BOX 743, BISMARCK, ND 58502-0743
PO BOX 744, BISMARCK, ND 58502-0744
PO BOX 745, BISMARCK, ND 58502-0745
PO BOX 746, BISMARCK, ND 58502-0746
PO BOX 747, BISMARCK, ND 58502-0747
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