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, SALEM, OR 97308-0601
PO BOX 602, SALEM, OR 97308-0602
PO BOX 603, SALEM, OR 97308-0603
PO BOX 604, SALEM, OR 97308-0604
PO BOX 605, SALEM, OR 97308-0605
PO BOX 606, SALEM, OR 97308-0606
PO BOX 607, SALEM, OR 97308-0607
PO BOX 608, SALEM, OR 97308-0608
PO BOX 609, SALEM, OR 97308-0609
PO BOX 610, SALEM, OR 97308-0610
PO BOX 611, SALEM, OR 97308-0611
PO BOX 612, SALEM, OR 97308-0612
PO BOX 613, SALEM, OR 97308-0613
PO BOX 614, SALEM, OR 97308-0614
PO BOX 615, SALEM, OR 97308-0615
PO BOX 616, SALEM, OR 97308-0616
PO BOX 617, SALEM, OR 97308-0617
PO BOX 618, SALEM, OR 97308-0618
PO BOX 619, SALEM, OR 97308-0619
PO BOX 620, SALEM, OR 97308-0620
PO BOX 621, SALEM, OR 97308-0621
PO BOX 622, SALEM, OR 97308-0622
PO BOX 623, SALEM, OR 97308-0623
PO BOX 624, SALEM, OR 97308-0624
PO BOX 625, SALEM, OR 97308-0625
PO BOX 626, SALEM, OR 97308-0626
PO BOX 627, SALEM, OR 97308-0627
PO BOX 628, SALEM, OR 97308-0628
PO BOX 629, SALEM, OR 97308-0629
PO BOX 630, SALEM, OR 97308-0630
PO BOX 631, SALEM, OR 97308-0631
PO BOX 632, SALEM, OR 97308-0632
PO BOX 633, SALEM, OR 97308-0633
PO BOX 634, SALEM, OR 97308-0634
PO BOX 635, SALEM, OR 97308-0635
PO BOX 636, SALEM, OR 97308-0636
PO BOX 637, SALEM, OR 97308-0637
PO BOX 638, SALEM, OR 97308-0638
PO BOX 639, SALEM, OR 97308-0639
PO BOX 640, SALEM, OR 97308-0640
PO BOX 641, SALEM, OR 97308-0641
PO BOX 642, SALEM, OR 97308-0642
PO BOX 643, SALEM, OR 97308-0643
PO BOX 644, SALEM, OR 97308-0644
PO BOX 645, SALEM, OR 97308-0645
PO BOX 646, SALEM, OR 97308-0646
PO BOX 647, SALEM, OR 97308-0647
PO BOX 648, SALEM, OR 97308-0648
PO BOX 649, SALEM, OR 97308-0649
PO BOX 650, SALEM, OR 97308-0650
PO BOX 651, SALEM, OR 97308-0651
PO BOX 652, SALEM, OR 97308-0652
PO BOX 653, SALEM, OR 97308-0653
PO BOX 654, SALEM, OR 97308-0654
PO BOX 655, SALEM, OR 97308-0655
PO BOX 656, SALEM, OR 97308-0656
PO BOX 657, SALEM, OR 97308-0657
PO BOX 658, SALEM, OR 97308-0658
PO BOX 659, SALEM, OR 97308-0659
PO BOX 660, SALEM, OR 97308-0660
PO BOX 661, SALEM, OR 97308-0661
PO BOX 662, SALEM, OR 97308-0662
PO BOX 663, SALEM, OR 97308-0663
PO BOX 664, SALEM, OR 97308-0664
PO BOX 665, SALEM, OR 97308-0665
PO BOX 666, SALEM, OR 97308-0666
PO BOX 667, SALEM, OR 97308-0667
PO BOX 668, SALEM, OR 97308-0668
PO BOX 669, SALEM, OR 97308-0669
PO BOX 670, SALEM, OR 97308-0670
PO BOX 671, SALEM, OR 97308-0671
PO BOX 672, SALEM, OR 97308-0672
PO BOX 673, SALEM, OR 97308-0673
PO BOX 674, SALEM, OR 97308-0674
PO BOX 675, SALEM, OR 97308-0675
PO BOX 676, SALEM, OR 97308-0676
PO BOX 677, SALEM, OR 97308-0677
PO BOX 678, SALEM, OR 97308-0678
PO BOX 679, SALEM, OR 97308-0679
PO BOX 680, SALEM, OR 97308-0680
PO BOX 681, SALEM, OR 97308-0681
PO BOX 682, SALEM, OR 97308-0682
PO BOX 683, SALEM, OR 97308-0683
PO BOX 684, SALEM, OR 97308-0684
PO BOX 685, SALEM, OR 97308-0685
PO BOX 686, SALEM, OR 97308-0686
PO BOX 687, SALEM, OR 97308-0687
PO BOX 688, SALEM, OR 97308-0688
PO BOX 689, SALEM, OR 97308-0689
PO BOX 690, SALEM, OR 97308-0690
PO BOX 691, SALEM, OR 97308-0691
PO BOX 692, SALEM, OR 97308-0692
PO BOX 693, SALEM, OR 97308-0693
PO BOX 694, SALEM, OR 97308-0694
PO BOX 695, SALEM, OR 97308-0695
PO BOX 696, SALEM, OR 97308-0696
PO BOX 697, SALEM, OR 97308-0697
PO BOX 698, SALEM, OR 97308-0698
PO BOX 699, SALEM, OR 97308-0699
PO BOX 700, SALEM, OR 97308-0700
PO BOX 701, SALEM, OR 97308-0701
PO BOX 702, SALEM, OR 97308-0702
PO BOX 703, SALEM, OR 97308-0703
PO BOX 704, SALEM, OR 97308-0704
PO BOX 705, SALEM, OR 97308-0705
PO BOX 706, SALEM, OR 97308-0706
PO BOX 707, SALEM, OR 97308-0707
PO BOX 708, SALEM, OR 97308-0708
PO BOX 709, SALEM, OR 97308-0709
PO BOX 710, SALEM, OR 97308-0710
PO BOX 711, SALEM, OR 97308-0711
PO BOX 712, SALEM, OR 97308-0712
PO BOX 713, SALEM, OR 97308-0713
PO BOX 714, SALEM, OR 97308-0714
PO BOX 715, SALEM, OR 97308-0715
PO BOX 716, SALEM, OR 97308-0716
PO BOX 717, SALEM, OR 97308-0717
PO BOX 718, SALEM, OR 97308-0718
PO BOX 719, SALEM, OR 97308-0719
PO BOX 720, SALEM, OR 97308-0720
PO BOX 721, SALEM, OR 97308-0721
PO BOX 722, SALEM, OR 97308-0722
PO BOX 723, SALEM, OR 97308-0723
PO BOX 724, SALEM, OR 97308-0724
PO BOX 725, SALEM, OR 97308-0725
PO BOX 726, SALEM, OR 97308-0726
PO BOX 727, SALEM, OR 97308-0727
PO BOX 728, SALEM, OR 97308-0728
PO BOX 729, SALEM, OR 97308-0729
PO BOX 730, SALEM, OR 97308-0730
PO BOX 731, SALEM, OR 97308-0731
PO BOX 732, SALEM, OR 97308-0732
PO BOX 733, SALEM, OR 97308-0733
PO BOX 734, SALEM, OR 97308-0734
PO BOX 735, SALEM, OR 97308-0735
PO BOX 736, SALEM, OR 97308-0736
PO BOX 737, SALEM, OR 97308-0737
PO BOX 738, SALEM, OR 97308-0738
PO BOX 739, SALEM, OR 97308-0739
PO BOX 740, SALEM, OR 97308-0740
PO BOX 741, SALEM, OR 97308-0741
PO BOX 742, SALEM, OR 97308-0742
PO BOX 743, SALEM, OR 97308-0743
PO BOX 744, SALEM, OR 97308-0744
PO BOX 745, SALEM, OR 97308-0745
PO BOX 746, SALEM, OR 97308-0746
PO BOX 747, SALEM, OR 97308-0747
PO BOX 748, SALEM, OR 97308-0748
PO BOX 749, SALEM, OR 97308-0749
PO BOX 750, SALEM, OR 97308-0750
PO BOX 751, SALEM, OR 97308-0751
PO BOX 752, SALEM, OR 97308-0752
PO BOX 753, SALEM, OR 97308-0753
PO BOX 754, SALEM, OR 97308-0754
PO BOX 755, SALEM, OR 97308-0755
PO BOX 756, SALEM, OR 97308-0756
PO BOX 757, SALEM, OR 97308-0757
PO BOX 758, SALEM, OR 97308-0758
PO BOX 759, SALEM, OR 97308-0759
PO BOX 760, SALEM, OR 97308-0760
PO BOX 761, SALEM, OR 97308-0761
PO BOX 762, SALEM, OR 97308-0762
PO BOX 763, SALEM, OR 97308-0763
PO BOX 764, SALEM, OR 97308-0764
PO BOX 765, SALEM, OR 97308-0765
PO BOX 766, SALEM, OR 97308-0766
PO BOX 767, SALEM, OR 97308-0767
PO BOX 768, SALEM, OR 97308-0768
PO BOX 769, SALEM, OR 97308-0769
PO BOX 770, SALEM, OR 97308-0770
PO BOX 771, SALEM, OR 97308-0771
PO BOX 772, SALEM, OR 97308-0772
PO BOX 773, SALEM, OR 97308-0773
PO BOX 774, SALEM, OR 97308-0774
PO BOX 775, SALEM, OR 97308-0775
PO BOX 776, SALEM, OR 97308-0776
PO BOX 777, SALEM, OR 97308-0777
PO BOX 778, SALEM, OR 97308-0778
PO BOX 779, SALEM, OR 97308-0779
PO BOX 780, SALEM, OR 97308-0780
PO BOX 781, SALEM, OR 97308-0781
PO BOX 782, SALEM, OR 97308-0782
PO BOX 783, SALEM, OR 97308-0783
PO BOX 784, SALEM, OR 97308-0784
PO BOX 785, SALEM, OR 97308-0785
PO BOX 786, SALEM, OR 97308-0786
PO BOX 787, SALEM, OR 97308-0787
PO BOX 788, SALEM, OR 97308-0788
PO BOX 789, SALEM, OR 97308-0789
PO BOX 790, SALEM, OR 97308-0790
PO BOX 791, SALEM, OR 97308-0791
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