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 721, SOUTH SAN FRANCISCO, CA 94083-0721
PO BOX 722, SOUTH SAN FRANCISCO, CA 94083-0722
PO BOX 723, SOUTH SAN FRANCISCO, CA 94083-0723
PO BOX 724, SOUTH SAN FRANCISCO, CA 94083-0724
PO BOX 725, SOUTH SAN FRANCISCO, CA 94083-0725
PO BOX 726, SOUTH SAN FRANCISCO, CA 94083-0726
PO BOX 727, SOUTH SAN FRANCISCO, CA 94083-0727
PO BOX 728, SOUTH SAN FRANCISCO, CA 94083-0728
PO BOX 729, SOUTH SAN FRANCISCO, CA 94083-0729
PO BOX 730, SOUTH SAN FRANCISCO, CA 94083-0730
PO BOX 731, SOUTH SAN FRANCISCO, CA 94083-0731
PO BOX 732, SOUTH SAN FRANCISCO, CA 94083-0732
PO BOX 733, SOUTH SAN FRANCISCO, CA 94083-0733
PO BOX 734, SOUTH SAN FRANCISCO, CA 94083-0734
PO BOX 735, SOUTH SAN FRANCISCO, CA 94083-0735
PO BOX 736, SOUTH SAN FRANCISCO, CA 94083-0736
PO BOX 737, SOUTH SAN FRANCISCO, CA 94083-0737
PO BOX 738, SOUTH SAN FRANCISCO, CA 94083-0738
PO BOX 739, SOUTH SAN FRANCISCO, CA 94083-0739
PO BOX 740, SOUTH SAN FRANCISCO, CA 94083-0740
PO BOX 741, SOUTH SAN FRANCISCO, CA 94083-0741
PO BOX 742, SOUTH SAN FRANCISCO, CA 94083-0742
PO BOX 743, SOUTH SAN FRANCISCO, CA 94083-0743
PO BOX 744, SOUTH SAN FRANCISCO, CA 94083-0744
PO BOX 745, SOUTH SAN FRANCISCO, CA 94083-0745
PO BOX 746, SOUTH SAN FRANCISCO, CA 94083-0746
PO BOX 747, SOUTH SAN FRANCISCO, CA 94083-0747
PO BOX 748, SOUTH SAN FRANCISCO, CA 94083-0748
PO BOX 749, SOUTH SAN FRANCISCO, CA 94083-0749
PO BOX 750, SOUTH SAN FRANCISCO, CA 94083-0750
PO BOX 751, SOUTH SAN FRANCISCO, CA 94083-0751
PO BOX 752, SOUTH SAN FRANCISCO, CA 94083-0752
PO BOX 753, SOUTH SAN FRANCISCO, CA 94083-0753
PO BOX 754, SOUTH SAN FRANCISCO, CA 94083-0754
PO BOX 755, SOUTH SAN FRANCISCO, CA 94083-0755
PO BOX 756, SOUTH SAN FRANCISCO, CA 94083-0756
PO BOX 757, SOUTH SAN FRANCISCO, CA 94083-0757
PO BOX 758, SOUTH SAN FRANCISCO, CA 94083-0758
PO BOX 759, SOUTH SAN FRANCISCO, CA 94083-0759
PO BOX 760, SOUTH SAN FRANCISCO, CA 94083-0760
PO BOX 761, SOUTH SAN FRANCISCO, CA 94083-0761
PO BOX 762, SOUTH SAN FRANCISCO, CA 94083-0762
PO BOX 763, SOUTH SAN FRANCISCO, CA 94083-0763
PO BOX 764, SOUTH SAN FRANCISCO, CA 94083-0764
PO BOX 765, SOUTH SAN FRANCISCO, CA 94083-0765
PO BOX 766, SOUTH SAN FRANCISCO, CA 94083-0766
PO BOX 767, SOUTH SAN FRANCISCO, CA 94083-0767
PO BOX 768, SOUTH SAN FRANCISCO, CA 94083-0768
PO BOX 769, SOUTH SAN FRANCISCO, CA 94083-0769
PO BOX 770, SOUTH SAN FRANCISCO, CA 94083-0770
PO BOX 771, SOUTH SAN FRANCISCO, CA 94083-0771
PO BOX 772, SOUTH SAN FRANCISCO, CA 94083-0772
PO BOX 773, SOUTH SAN FRANCISCO, CA 94083-0773
PO BOX 774, SOUTH SAN FRANCISCO, CA 94083-0774
PO BOX 775, SOUTH SAN FRANCISCO, CA 94083-0775
PO BOX 776, SOUTH SAN FRANCISCO, CA 94083-0776
PO BOX 777, SOUTH SAN FRANCISCO, CA 94083-0777
PO BOX 778, SOUTH SAN FRANCISCO, CA 94083-0778
PO BOX 779, SOUTH SAN FRANCISCO, CA 94083-0779
PO BOX 780, SOUTH SAN FRANCISCO, CA 94083-0780
PO BOX 781, SOUTH SAN FRANCISCO, CA 94083-0781
PO BOX 782, SOUTH SAN FRANCISCO, CA 94083-0782
PO BOX 783, SOUTH SAN FRANCISCO, CA 94083-0783
PO BOX 784, SOUTH SAN FRANCISCO, CA 94083-0784
PO BOX 785, SOUTH SAN FRANCISCO, CA 94083-0785
PO BOX 786, SOUTH SAN FRANCISCO, CA 94083-0786
PO BOX 787, SOUTH SAN FRANCISCO, CA 94083-0787
PO BOX 788, SOUTH SAN FRANCISCO, CA 94083-0788
PO BOX 789, SOUTH SAN FRANCISCO, CA 94083-0789
PO BOX 790, SOUTH SAN FRANCISCO, CA 94083-0790
PO BOX 791, SOUTH SAN FRANCISCO, CA 94083-0791
PO BOX 792, SOUTH SAN FRANCISCO, CA 94083-0792
PO BOX 793, SOUTH SAN FRANCISCO, CA 94083-0793
PO BOX 794, SOUTH SAN FRANCISCO, CA 94083-0794
PO BOX 795, SOUTH SAN FRANCISCO, CA 94083-0795
PO BOX 796, SOUTH SAN FRANCISCO, CA 94083-0796
PO BOX 797, SOUTH SAN FRANCISCO, CA 94083-0797
PO BOX 798, SOUTH SAN FRANCISCO, CA 94083-0798
PO BOX 799, SOUTH SAN FRANCISCO, CA 94083-0799
PO BOX 800, SOUTH SAN FRANCISCO, CA 94083-0800
PO BOX 801, SOUTH SAN FRANCISCO, CA 94083-0801
PO BOX 802, SOUTH SAN FRANCISCO, CA 94083-0802
PO BOX 803, SOUTH SAN FRANCISCO, CA 94083-0803
PO BOX 804, SOUTH SAN FRANCISCO, CA 94083-0804
PO BOX 805, SOUTH SAN FRANCISCO, CA 94083-0805
PO BOX 806, SOUTH SAN FRANCISCO, CA 94083-0806
PO BOX 807, SOUTH SAN FRANCISCO, CA 94083-0807
PO BOX 808, SOUTH SAN FRANCISCO, CA 94083-0808
PO BOX 809, SOUTH SAN FRANCISCO, CA 94083-0809
PO BOX 810, SOUTH SAN FRANCISCO, CA 94083-0810
PO BOX 811, SOUTH SAN FRANCISCO, CA 94083-0811
PO BOX 812, SOUTH SAN FRANCISCO, CA 94083-0812
PO BOX 813, SOUTH SAN FRANCISCO, CA 94083-0813
PO BOX 814, SOUTH SAN FRANCISCO, CA 94083-0814
PO BOX 815, SOUTH SAN FRANCISCO, CA 94083-0815
PO BOX 816, SOUTH SAN FRANCISCO, CA 94083-0816
PO BOX 817, SOUTH SAN FRANCISCO, CA 94083-0817
PO BOX 818, SOUTH SAN FRANCISCO, CA 94083-0818
PO BOX 819, SOUTH SAN FRANCISCO, CA 94083-0819
PO BOX 820, SOUTH SAN FRANCISCO, CA 94083-0820
PO BOX 821, SOUTH SAN FRANCISCO, CA 94083-0821
PO BOX 822, SOUTH SAN FRANCISCO, CA 94083-0822
PO BOX 823, SOUTH SAN FRANCISCO, CA 94083-0823
PO BOX 824, SOUTH SAN FRANCISCO, CA 94083-0824
PO BOX 825, SOUTH SAN FRANCISCO, CA 94083-0825
PO BOX 826, SOUTH SAN FRANCISCO, CA 94083-0826
PO BOX 827, SOUTH SAN FRANCISCO, CA 94083-0827
PO BOX 828, SOUTH SAN FRANCISCO, CA 94083-0828
PO BOX 829, SOUTH SAN FRANCISCO, CA 94083-0829
PO BOX 830, SOUTH SAN FRANCISCO, CA 94083-0830
PO BOX 831, SOUTH SAN FRANCISCO, CA 94083-0831
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