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 651, SAN FRANCISCO, CA 94104-0651
PO BOX 652, SAN FRANCISCO, CA 94104-0652
PO BOX 653, SAN FRANCISCO, CA 94104-0653
PO BOX 654, SAN FRANCISCO, CA 94104-0654
PO BOX 655, SAN FRANCISCO, CA 94104-0655
PO BOX 656, SAN FRANCISCO, CA 94104-0656
PO BOX 657, SAN FRANCISCO, CA 94104-0657
PO BOX 658, SAN FRANCISCO, CA 94104-0658
PO BOX 659, SAN FRANCISCO, CA 94104-0659
PO BOX 660, SAN FRANCISCO, CA 94104-0660
PO BOX 661, SAN FRANCISCO, CA 94104-0661
PO BOX 662, SAN FRANCISCO, CA 94104-0662
PO BOX 663, SAN FRANCISCO, CA 94104-0663
PO BOX 664, SAN FRANCISCO, CA 94104-0664
PO BOX 665, SAN FRANCISCO, CA 94104-0665
PO BOX 666, SAN FRANCISCO, CA 94104-0666
PO BOX 667, SAN FRANCISCO, CA 94104-0667
PO BOX 668, SAN FRANCISCO, CA 94104-0668
PO BOX 669, SAN FRANCISCO, CA 94104-0669
PO BOX 670, SAN FRANCISCO, CA 94104-0670
PO BOX 671, SAN FRANCISCO, CA 94104-0671
PO BOX 672, SAN FRANCISCO, CA 94104-0672
PO BOX 673, SAN FRANCISCO, CA 94104-0673
PO BOX 674, SAN FRANCISCO, CA 94104-0674
PO BOX 675, SAN FRANCISCO, CA 94104-0675
PO BOX 676, SAN FRANCISCO, CA 94104-0676
PO BOX 677, SAN FRANCISCO, CA 94104-0677
PO BOX 678, SAN FRANCISCO, CA 94104-0678
PO BOX 679, SAN FRANCISCO, CA 94104-0679
PO BOX 680, SAN FRANCISCO, CA 94104-0680
PO BOX 681, SAN FRANCISCO, CA 94104-0681
PO BOX 682, SAN FRANCISCO, CA 94104-0682
PO BOX 683, SAN FRANCISCO, CA 94104-0683
PO BOX 684, SAN FRANCISCO, CA 94104-0684
PO BOX 685, SAN FRANCISCO, CA 94104-0685
PO BOX 686, SAN FRANCISCO, CA 94104-0686
PO BOX 687, SAN FRANCISCO, CA 94104-0687
PO BOX 688, SAN FRANCISCO, CA 94104-0688
PO BOX 689, SAN FRANCISCO, CA 94104-0689
PO BOX 690, SAN FRANCISCO, CA 94104-0690
PO BOX 691, SAN FRANCISCO, CA 94104-0691
PO BOX 692, SAN FRANCISCO, CA 94104-0692
PO BOX 693, SAN FRANCISCO, CA 94104-0693
PO BOX 694, SAN FRANCISCO, CA 94104-0694
PO BOX 695, SAN FRANCISCO, CA 94104-0695
PO BOX 696, SAN FRANCISCO, CA 94104-0696
PO BOX 697, SAN FRANCISCO, CA 94104-0697
PO BOX 698, SAN FRANCISCO, CA 94104-0698
PO BOX 699, SAN FRANCISCO, CA 94104-0699
PO BOX 700, SAN FRANCISCO, CA 94104-0700
PO BOX 701, SAN FRANCISCO, CA 94104-0701
PO BOX 702, SAN FRANCISCO, CA 94104-0702
PO BOX 703, SAN FRANCISCO, CA 94104-0703
PO BOX 704, SAN FRANCISCO, CA 94104-0704
PO BOX 705, SAN FRANCISCO, CA 94104-0705
PO BOX 706, SAN FRANCISCO, CA 94104-0706
PO BOX 707, SAN FRANCISCO, CA 94104-0707
PO BOX 708, SAN FRANCISCO, CA 94104-0708
PO BOX 709, SAN FRANCISCO, CA 94104-0709
PO BOX 710, SAN FRANCISCO, CA 94104-0710
PO BOX 711, SAN FRANCISCO, CA 94104-0711
PO BOX 712, SAN FRANCISCO, CA 94104-0712
PO BOX 713, SAN FRANCISCO, CA 94104-0713
PO BOX 714, SAN FRANCISCO, CA 94104-0714
PO BOX 715, SAN FRANCISCO, CA 94104-0715
PO BOX 716, SAN FRANCISCO, CA 94104-0716
PO BOX 717, SAN FRANCISCO, CA 94104-0717
PO BOX 718, SAN FRANCISCO, CA 94104-0718
PO BOX 719, SAN FRANCISCO, CA 94104-0719
PO BOX 720, SAN FRANCISCO, CA 94104-0720
PO BOX 721, SAN FRANCISCO, CA 94104-0721
PO BOX 722, SAN FRANCISCO, CA 94104-0722
PO BOX 723, SAN FRANCISCO, CA 94104-0723
PO BOX 724, SAN FRANCISCO, CA 94104-0724
PO BOX 725, SAN FRANCISCO, CA 94104-0725
PO BOX 726, SAN FRANCISCO, CA 94104-0726
PO BOX 727, SAN FRANCISCO, CA 94104-0727
PO BOX 728, SAN FRANCISCO, CA 94104-0728
PO BOX 729, SAN FRANCISCO, CA 94104-0729
PO BOX 730, SAN FRANCISCO, CA 94104-0730
PO BOX 731, SAN FRANCISCO, CA 94104-0731
PO BOX 732, SAN FRANCISCO, CA 94104-0732
PO BOX 733, SAN FRANCISCO, CA 94104-0733
PO BOX 734, SAN FRANCISCO, CA 94104-0734
PO BOX 735, SAN FRANCISCO, CA 94104-0735
PO BOX 736, SAN FRANCISCO, CA 94104-0736
PO BOX 737, SAN FRANCISCO, CA 94104-0737
PO BOX 738, SAN FRANCISCO, CA 94104-0738
PO BOX 739, SAN FRANCISCO, CA 94104-0739
PO BOX 740, SAN FRANCISCO, CA 94104-0740
PO BOX 741, SAN FRANCISCO, CA 94104-0741
PO BOX 742, SAN FRANCISCO, CA 94104-0742
PO BOX 743, SAN FRANCISCO, CA 94104-0743
PO BOX 744, SAN FRANCISCO, CA 94104-0744
PO BOX 745, SAN FRANCISCO, CA 94104-0745
PO BOX 746, SAN FRANCISCO, CA 94104-0746
PO BOX 747, SAN FRANCISCO, CA 94104-0747
PO BOX 748, SAN FRANCISCO, CA 94104-0748
PO BOX 749, SAN FRANCISCO, CA 94104-0749
PO BOX 750, SAN FRANCISCO, CA 94104-0750
PO BOX 751, SAN FRANCISCO, CA 94104-0751
PO BOX 752, SAN FRANCISCO, CA 94104-0752
PO BOX 753, SAN FRANCISCO, CA 94104-0753
PO BOX 754, SAN FRANCISCO, CA 94104-0754
PO BOX 755, SAN FRANCISCO, CA 94104-0755
PO BOX 756, SAN FRANCISCO, CA 94104-0756
PO BOX 757, SAN FRANCISCO, CA 94104-0757
PO BOX 758, SAN FRANCISCO, CA 94104-0758
PO BOX 759, SAN FRANCISCO, CA 94104-0759
PO BOX 760, SAN FRANCISCO, CA 94104-0760
PO BOX 761, SAN FRANCISCO, CA 94104-0761
PO BOX 762, SAN FRANCISCO, CA 94104-0762
PO BOX 763, SAN FRANCISCO, CA 94104-0763
PO BOX 764, SAN FRANCISCO, CA 94104-0764
PO BOX 765, SAN FRANCISCO, CA 94104-0765
PO BOX 766, SAN FRANCISCO, CA 94104-0766
PO BOX 767, SAN FRANCISCO, CA 94104-0767
PO BOX 768, SAN FRANCISCO, CA 94104-0768
PO BOX 769, SAN FRANCISCO, CA 94104-0769
PO BOX 770, SAN FRANCISCO, CA 94104-0770
PO BOX 771, SAN FRANCISCO, CA 94104-0771
PO BOX 772, SAN FRANCISCO, CA 94104-0772
PO BOX 773, SAN FRANCISCO, CA 94104-0773
PO BOX 774, SAN FRANCISCO, CA 94104-0774
PO BOX 775, SAN FRANCISCO, CA 94104-0775
PO BOX 776, SAN FRANCISCO, CA 94104-0776
PO BOX 777, SAN FRANCISCO, CA 94104-0777
PO BOX 778, SAN FRANCISCO, CA 94104-0778
PO BOX 779, SAN FRANCISCO, CA 94104-0779
PO BOX 780, SAN FRANCISCO, CA 94104-0780
PO BOX 781, SAN FRANCISCO, CA 94104-0781
PO BOX 782, SAN FRANCISCO, CA 94104-0782
PO BOX 783, SAN FRANCISCO, CA 94104-0783
PO BOX 784, SAN FRANCISCO, CA 94104-0784
PO BOX 785, SAN FRANCISCO, CA 94104-0785
PO BOX 786, SAN FRANCISCO, CA 94104-0786
PO BOX 787, SAN FRANCISCO, CA 94104-0787
PO BOX 788, SAN FRANCISCO, CA 94104-0788
PO BOX 789, SAN FRANCISCO, CA 94104-0789
PO BOX 790, SAN FRANCISCO, CA 94104-0790
PO BOX 791, SAN FRANCISCO, CA 94104-0791
PO BOX 792, SAN FRANCISCO, CA 94104-0792
PO BOX 793, SAN FRANCISCO, CA 94104-0793
PO BOX 794, SAN FRANCISCO, CA 94104-0794
PO BOX 795, SAN FRANCISCO, CA 94104-0795
PO BOX 796, SAN FRANCISCO, CA 94104-0796
PO BOX 797, SAN FRANCISCO, CA 94104-0797
PO BOX 798, SAN FRANCISCO, CA 94104-0798
PO BOX 799, SAN FRANCISCO, CA 94104-0799
PO BOX 800, SAN FRANCISCO, CA 94104-0800
PO BOX 801, SAN FRANCISCO, CA 94104-0801
PO BOX 802, SAN FRANCISCO, CA 94104-0802
PO BOX 803, SAN FRANCISCO, CA 94104-0803
PO BOX 804, SAN FRANCISCO, CA 94104-0804
PO BOX 805, SAN FRANCISCO, CA 94104-0805
PO BOX 806, SAN FRANCISCO, CA 94104-0806
PO BOX 807, SAN FRANCISCO, CA 94104-0807
PO BOX 808, SAN FRANCISCO, CA 94104-0808
PO BOX 809, SAN FRANCISCO, CA 94104-0809
PO BOX 810, SAN FRANCISCO, CA 94104-0810
PO BOX 811, SAN FRANCISCO, CA 94104-0811
PO BOX 812, SAN FRANCISCO, CA 94104-0812
PO BOX 813, SAN FRANCISCO, CA 94104-0813
PO BOX 814, SAN FRANCISCO, CA 94104-0814
PO BOX 815, SAN FRANCISCO, CA 94104-0815
PO BOX 816, SAN FRANCISCO, CA 94104-0816
PO BOX 817, SAN FRANCISCO, CA 94104-0817
PO BOX 818, SAN FRANCISCO, CA 94104-0818
PO BOX 819, SAN FRANCISCO, CA 94104-0819
PO BOX 820, SAN FRANCISCO, CA 94104-0820
PO BOX 821, SAN FRANCISCO, CA 94104-0821
PO BOX 822, SAN FRANCISCO, CA 94104-0822
PO BOX 823, SAN FRANCISCO, CA 94104-0823
PO BOX 824, SAN FRANCISCO, CA 94104-0824
PO BOX 825, SAN FRANCISCO, CA 94104-0825
PO BOX 826, SAN FRANCISCO, CA 94104-0826
PO BOX 827, SAN FRANCISCO, CA 94104-0827
PO BOX 828, SAN FRANCISCO, CA 94104-0828
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