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 751, PORTSMOUTH, VA 23705-0751
PO BOX 752, PORTSMOUTH, VA 23705-0752
PO BOX 753, PORTSMOUTH, VA 23705-0753
PO BOX 754, PORTSMOUTH, VA 23705-0754
PO BOX 755, PORTSMOUTH, VA 23705-0755
PO BOX 756, PORTSMOUTH, VA 23705-0756
PO BOX 757, PORTSMOUTH, VA 23705-0757
PO BOX 758, PORTSMOUTH, VA 23705-0758
PO BOX 759, PORTSMOUTH, VA 23705-0759
PO BOX 760, PORTSMOUTH, VA 23705-0760
PO BOX 761, PORTSMOUTH, VA 23705-0761
PO BOX 762, PORTSMOUTH, VA 23705-0762
PO BOX 763, PORTSMOUTH, VA 23705-0763
PO BOX 764, PORTSMOUTH, VA 23705-0764
PO BOX 765, PORTSMOUTH, VA 23705-0765
PO BOX 766, PORTSMOUTH, VA 23705-0766
PO BOX 767, PORTSMOUTH, VA 23705-0767
PO BOX 768, PORTSMOUTH, VA 23705-0768
PO BOX 769, PORTSMOUTH, VA 23705-0769
PO BOX 770, PORTSMOUTH, VA 23705-0770
PO BOX 771, PORTSMOUTH, VA 23705-0771
PO BOX 772, PORTSMOUTH, VA 23705-0772
PO BOX 773, PORTSMOUTH, VA 23705-0773
PO BOX 774, PORTSMOUTH, VA 23705-0774
PO BOX 775, PORTSMOUTH, VA 23705-0775
PO BOX 776, PORTSMOUTH, VA 23705-0776
PO BOX 777, PORTSMOUTH, VA 23705-0777
PO BOX 778, PORTSMOUTH, VA 23705-0778
PO BOX 779, PORTSMOUTH, VA 23705-0779
PO BOX 780, PORTSMOUTH, VA 23705-0780
PO BOX 781, PORTSMOUTH, VA 23705-0781
PO BOX 782, PORTSMOUTH, VA 23705-0782
PO BOX 783, PORTSMOUTH, VA 23705-0783
PO BOX 784, PORTSMOUTH, VA 23705-0784
PO BOX 785, PORTSMOUTH, VA 23705-0785
PO BOX 786, PORTSMOUTH, VA 23705-0786
PO BOX 787, PORTSMOUTH, VA 23705-0787
PO BOX 788, PORTSMOUTH, VA 23705-0788
PO BOX 789, PORTSMOUTH, VA 23705-0789
PO BOX 790, PORTSMOUTH, VA 23705-0790
PO BOX 791, PORTSMOUTH, VA 23705-0791
PO BOX 792, PORTSMOUTH, VA 23705-0792
PO BOX 793, PORTSMOUTH, VA 23705-0793
PO BOX 794, PORTSMOUTH, VA 23705-0794
PO BOX 795, PORTSMOUTH, VA 23705-0795
PO BOX 796, PORTSMOUTH, VA 23705-0796
PO BOX 797, PORTSMOUTH, VA 23705-0797
PO BOX 798, PORTSMOUTH, VA 23705-0798
PO BOX 799, PORTSMOUTH, VA 23705-0799
PO BOX 800, PORTSMOUTH, VA 23705-0800
PO BOX 801, PORTSMOUTH, VA 23705-0801
PO BOX 802, PORTSMOUTH, VA 23705-0802
PO BOX 803, PORTSMOUTH, VA 23705-0803
PO BOX 804, PORTSMOUTH, VA 23705-0804
PO BOX 805, PORTSMOUTH, VA 23705-0805
PO BOX 806, PORTSMOUTH, VA 23705-0806
PO BOX 807, PORTSMOUTH, VA 23705-0807
PO BOX 808, PORTSMOUTH, VA 23705-0808
PO BOX 809, PORTSMOUTH, VA 23705-0809
PO BOX 810, PORTSMOUTH, VA 23705-0810
PO BOX 811, PORTSMOUTH, VA 23705-0811
PO BOX 812, PORTSMOUTH, VA 23705-0812
PO BOX 813, PORTSMOUTH, VA 23705-0813
PO BOX 814, PORTSMOUTH, VA 23705-0814
PO BOX 815, PORTSMOUTH, VA 23705-0815
PO BOX 816, PORTSMOUTH, VA 23705-0816
PO BOX 817, PORTSMOUTH, VA 23705-0817
PO BOX 818, PORTSMOUTH, VA 23705-0818
PO BOX 819, PORTSMOUTH, VA 23705-0819
PO BOX 820, PORTSMOUTH, VA 23705-0820
PO BOX 821, PORTSMOUTH, VA 23705-0821
PO BOX 822, PORTSMOUTH, VA 23705-0822
PO BOX 823, PORTSMOUTH, VA 23705-0823
PO BOX 824, PORTSMOUTH, VA 23705-0824
PO BOX 825, PORTSMOUTH, VA 23705-0825
PO BOX 826, PORTSMOUTH, VA 23705-0826
PO BOX 827, PORTSMOUTH, VA 23705-0827
PO BOX 828, PORTSMOUTH, VA 23705-0828
PO BOX 829, PORTSMOUTH, VA 23705-0829
PO BOX 830, PORTSMOUTH, VA 23705-0830
PO BOX 831, PORTSMOUTH, VA 23705-0831
PO BOX 832, PORTSMOUTH, VA 23705-0832
PO BOX 833, PORTSMOUTH, VA 23705-0833
PO BOX 834, PORTSMOUTH, VA 23705-0834
PO BOX 835, PORTSMOUTH, VA 23705-0835
PO BOX 836, PORTSMOUTH, VA 23705-0836
PO BOX 837, PORTSMOUTH, VA 23705-0837
PO BOX 838, PORTSMOUTH, VA 23705-0838
PO BOX 839, PORTSMOUTH, VA 23705-0839
PO BOX 840, PORTSMOUTH, VA 23705-0840
PO BOX 841, PORTSMOUTH, VA 23705-0841
PO BOX 842, PORTSMOUTH, VA 23705-0842
PO BOX 843, PORTSMOUTH, VA 23705-0843
PO BOX 844, PORTSMOUTH, VA 23705-0844
PO BOX 845, PORTSMOUTH, VA 23705-0845
PO BOX 846, PORTSMOUTH, VA 23705-0846
PO BOX 847, PORTSMOUTH, VA 23705-0847
PO BOX 848, PORTSMOUTH, VA 23705-0848
PO BOX 849, PORTSMOUTH, VA 23705-0849
PO BOX 850, PORTSMOUTH, VA 23705-0850
PO BOX 851, PORTSMOUTH, VA 23705-0851
PO BOX 852, PORTSMOUTH, VA 23705-0852
PO BOX 853, PORTSMOUTH, VA 23705-0853
PO BOX 854, PORTSMOUTH, VA 23705-0854
PO BOX 855, PORTSMOUTH, VA 23705-0855
PO BOX 856, PORTSMOUTH, VA 23705-0856
PO BOX 857, PORTSMOUTH, VA 23705-0857
PO BOX 858, PORTSMOUTH, VA 23705-0858
PO BOX 859, PORTSMOUTH, VA 23705-0859
PO BOX 860, PORTSMOUTH, VA 23705-0860
PO BOX 861, PORTSMOUTH, VA 23705-0861
PO BOX 862, PORTSMOUTH, VA 23705-0862
PO BOX 863, PORTSMOUTH, VA 23705-0863
PO BOX 864, PORTSMOUTH, VA 23705-0864
PO BOX 865, PORTSMOUTH, VA 23705-0865
PO BOX 866, PORTSMOUTH, VA 23705-0866
PO BOX 867, PORTSMOUTH, VA 23705-0867
PO BOX 868, PORTSMOUTH, VA 23705-0868
PO BOX 869, PORTSMOUTH, VA 23705-0869
PO BOX 870, PORTSMOUTH, VA 23705-0870
PO BOX 871, PORTSMOUTH, VA 23705-0871
PO BOX 872, PORTSMOUTH, VA 23705-0872
PO BOX 873, PORTSMOUTH, VA 23705-0873
PO BOX 874, PORTSMOUTH, VA 23705-0874
PO BOX 875, PORTSMOUTH, VA 23705-0875
PO BOX 876, PORTSMOUTH, VA 23705-0876
PO BOX 877, PORTSMOUTH, VA 23705-0877
PO BOX 878, PORTSMOUTH, VA 23705-0878
PO BOX 879, PORTSMOUTH, VA 23705-0879
PO BOX 880, PORTSMOUTH, VA 23705-0880
PO BOX 881, PORTSMOUTH, VA 23705-0881
PO BOX 882, PORTSMOUTH, VA 23705-0882
PO BOX 883, PORTSMOUTH, VA 23705-0883
PO BOX 884, PORTSMOUTH, VA 23705-0884
PO BOX 885, PORTSMOUTH, VA 23705-0885
PO BOX 886, PORTSMOUTH, VA 23705-0886
PO BOX 887, PORTSMOUTH, VA 23705-0887
PO BOX 888, PORTSMOUTH, VA 23705-0888
PO BOX 889, PORTSMOUTH, VA 23705-0889
PO BOX 890, PORTSMOUTH, VA 23705-0890
PO BOX 891, PORTSMOUTH, VA 23705-0891
PO BOX 892, PORTSMOUTH, VA 23705-0892
PO BOX 893, PORTSMOUTH, VA 23705-0893
PO BOX 894, PORTSMOUTH, VA 23705-0894
PO BOX 895, PORTSMOUTH, VA 23705-0895
PO BOX 896, PORTSMOUTH, VA 23705-0896
PO BOX 897, PORTSMOUTH, VA 23705-0897
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