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 731, SMITHFIELD, NC 27577-0731
PO BOX 732, SMITHFIELD, NC 27577-0732
PO BOX 733, SMITHFIELD, NC 27577-0733
PO BOX 734, SMITHFIELD, NC 27577-0734
PO BOX 735, SMITHFIELD, NC 27577-0735
PO BOX 736, SMITHFIELD, NC 27577-0736
PO BOX 737, SMITHFIELD, NC 27577-0737
PO BOX 738, SMITHFIELD, NC 27577-0738
PO BOX 739, SMITHFIELD, NC 27577-0739
PO BOX 740, SMITHFIELD, NC 27577-0740
PO BOX 741, SMITHFIELD, NC 27577-0741
PO BOX 742, SMITHFIELD, NC 27577-0742
PO BOX 743, SMITHFIELD, NC 27577-0743
PO BOX 744, SMITHFIELD, NC 27577-0744
PO BOX 745, SMITHFIELD, NC 27577-0745
PO BOX 746, SMITHFIELD, NC 27577-0746
PO BOX 747, SMITHFIELD, NC 27577-0747
PO BOX 748, SMITHFIELD, NC 27577-0748
PO BOX 749, SMITHFIELD, NC 27577-0749
PO BOX 750, SMITHFIELD, NC 27577-0750
PO BOX 751, SMITHFIELD, NC 27577-0751
PO BOX 752, SMITHFIELD, NC 27577-0752
PO BOX 753, SMITHFIELD, NC 27577-0753
PO BOX 754, SMITHFIELD, NC 27577-0754
PO BOX 755, SMITHFIELD, NC 27577-0755
PO BOX 756, SMITHFIELD, NC 27577-0756
PO BOX 757, SMITHFIELD, NC 27577-0757
PO BOX 758, SMITHFIELD, NC 27577-0758
PO BOX 759, SMITHFIELD, NC 27577-0759
PO BOX 760, SMITHFIELD, NC 27577-0760
PO BOX 761, SMITHFIELD, NC 27577-0761
PO BOX 762, SMITHFIELD, NC 27577-0762
PO BOX 763, SMITHFIELD, NC 27577-0763
PO BOX 764, SMITHFIELD, NC 27577-0764
PO BOX 765, SMITHFIELD, NC 27577-0765
PO BOX 766, SMITHFIELD, NC 27577-0766
PO BOX 767, SMITHFIELD, NC 27577-0767
PO BOX 768, SMITHFIELD, NC 27577-0768
PO BOX 769, SMITHFIELD, NC 27577-0769
PO BOX 770, SMITHFIELD, NC 27577-0770
PO BOX 771, SMITHFIELD, NC 27577-0771
PO BOX 772, SMITHFIELD, NC 27577-0772
PO BOX 773, SMITHFIELD, NC 27577-0773
PO BOX 774, SMITHFIELD, NC 27577-0774
PO BOX 775, SMITHFIELD, NC 27577-0775
PO BOX 776, SMITHFIELD, NC 27577-0776
PO BOX 777, SMITHFIELD, NC 27577-0777
PO BOX 778, SMITHFIELD, NC 27577-0778
PO BOX 779, SMITHFIELD, NC 27577-0779
PO BOX 780, SMITHFIELD, NC 27577-0780
PO BOX 781, SMITHFIELD, NC 27577-0781
PO BOX 782, SMITHFIELD, NC 27577-0782
PO BOX 783, SMITHFIELD, NC 27577-0783
PO BOX 784, SMITHFIELD, NC 27577-0784
PO BOX 785, SMITHFIELD, NC 27577-0785
PO BOX 786, SMITHFIELD, NC 27577-0786
PO BOX 787, SMITHFIELD, NC 27577-0787
PO BOX 788, SMITHFIELD, NC 27577-0788
PO BOX 789, SMITHFIELD, NC 27577-0789
PO BOX 790, SMITHFIELD, NC 27577-0790
PO BOX 791, SMITHFIELD, NC 27577-0791
PO BOX 792, SMITHFIELD, NC 27577-0792
PO BOX 793, SMITHFIELD, NC 27577-0793
PO BOX 794, SMITHFIELD, NC 27577-0794
PO BOX 795, SMITHFIELD, NC 27577-0795
PO BOX 796, SMITHFIELD, NC 27577-0796
PO BOX 797, SMITHFIELD, NC 27577-0797
PO BOX 798, SMITHFIELD, NC 27577-0798
PO BOX 799, SMITHFIELD, NC 27577-0799
PO BOX 800, SMITHFIELD, NC 27577-0800
PO BOX 801, SMITHFIELD, NC 27577-0801
PO BOX 802, SMITHFIELD, NC 27577-0802
PO BOX 803, SMITHFIELD, NC 27577-0803
PO BOX 804, SMITHFIELD, NC 27577-0804
PO BOX 805, SMITHFIELD, NC 27577-0805
PO BOX 806, SMITHFIELD, NC 27577-0806
PO BOX 807, SMITHFIELD, NC 27577-0807
PO BOX 808, SMITHFIELD, NC 27577-0808
PO BOX 809, SMITHFIELD, NC 27577-0809
PO BOX 810, SMITHFIELD, NC 27577-0810
PO BOX 811, SMITHFIELD, NC 27577-0811
PO BOX 812, SMITHFIELD, NC 27577-0812
PO BOX 813, SMITHFIELD, NC 27577-0813
PO BOX 814, SMITHFIELD, NC 27577-0814
PO BOX 815, SMITHFIELD, NC 27577-0815
PO BOX 816, SMITHFIELD, NC 27577-0816
PO BOX 817, SMITHFIELD, NC 27577-0817
PO BOX 818, SMITHFIELD, NC 27577-0818
PO BOX 819, SMITHFIELD, NC 27577-0819
PO BOX 820, SMITHFIELD, NC 27577-0820
PO BOX 821, SMITHFIELD, NC 27577-0821
PO BOX 822, SMITHFIELD, NC 27577-0822
PO BOX 823, SMITHFIELD, NC 27577-0823
PO BOX 824, SMITHFIELD, NC 27577-0824
PO BOX 825, SMITHFIELD, NC 27577-0825
PO BOX 826, SMITHFIELD, NC 27577-0826
PO BOX 827, SMITHFIELD, NC 27577-0827
PO BOX 828, SMITHFIELD, NC 27577-0828
PO BOX 829, SMITHFIELD, NC 27577-0829
PO BOX 830, SMITHFIELD, NC 27577-0830
PO BOX 831, SMITHFIELD, NC 27577-0831
PO BOX 832, SMITHFIELD, NC 27577-0832
PO BOX 833, SMITHFIELD, NC 27577-0833
PO BOX 834, SMITHFIELD, NC 27577-0834
PO BOX 835, SMITHFIELD, NC 27577-0835
PO BOX 836, SMITHFIELD, NC 27577-0836
PO BOX 837, SMITHFIELD, NC 27577-0837
PO BOX 838, SMITHFIELD, NC 27577-0838
PO BOX 839, SMITHFIELD, NC 27577-0839
PO BOX 840, SMITHFIELD, NC 27577-0840
PO BOX 841, SMITHFIELD, NC 27577-0841
PO BOX 842, SMITHFIELD, NC 27577-0842
PO BOX 843, SMITHFIELD, NC 27577-0843
PO BOX 844, SMITHFIELD, NC 27577-0844
PO BOX 845, SMITHFIELD, NC 27577-0845
PO BOX 846, SMITHFIELD, NC 27577-0846
PO BOX 847, SMITHFIELD, NC 27577-0847
PO BOX 848, SMITHFIELD, NC 27577-0848
PO BOX 849, SMITHFIELD, NC 27577-0849
PO BOX 850, SMITHFIELD, NC 27577-0850
PO BOX 851, SMITHFIELD, NC 27577-0851
PO BOX 852, SMITHFIELD, NC 27577-0852
PO BOX 853, SMITHFIELD, NC 27577-0853
PO BOX 854, SMITHFIELD, NC 27577-0854
PO BOX 855, SMITHFIELD, NC 27577-0855
PO BOX 856, SMITHFIELD, NC 27577-0856
PO BOX 857, SMITHFIELD, NC 27577-0857
PO BOX 858, SMITHFIELD, NC 27577-0858
PO BOX 859, SMITHFIELD, NC 27577-0859
PO BOX 860, SMITHFIELD, NC 27577-0860
PO BOX 861, SMITHFIELD, NC 27577-0861
PO BOX 862, SMITHFIELD, NC 27577-0862
PO BOX 863, SMITHFIELD, NC 27577-0863
PO BOX 864, SMITHFIELD, NC 27577-0864
PO BOX 865, SMITHFIELD, NC 27577-0865
PO BOX 866, SMITHFIELD, NC 27577-0866
PO BOX 867, SMITHFIELD, NC 27577-0867
PO BOX 868, SMITHFIELD, NC 27577-0868
PO BOX 869, SMITHFIELD, NC 27577-0869
PO BOX 870, SMITHFIELD, NC 27577-0870
PO BOX 871, SMITHFIELD, NC 27577-0871
PO BOX 872, SMITHFIELD, NC 27577-0872
PO BOX 873, SMITHFIELD, NC 27577-0873
PO BOX 874, SMITHFIELD, NC 27577-0874
PO BOX 875, SMITHFIELD, NC 27577-0875
PO BOX 876, SMITHFIELD, NC 27577-0876
PO BOX 877, SMITHFIELD, NC 27577-0877
PO BOX 878, SMITHFIELD, NC 27577-0878
PO BOX 879, SMITHFIELD, NC 27577-0879
PO BOX 880, SMITHFIELD, NC 27577-0880
PO BOX 881, SMITHFIELD, NC 27577-0881
PO BOX 882, SMITHFIELD, NC 27577-0882
PO BOX 883, SMITHFIELD, NC 27577-0883
PO BOX 884, SMITHFIELD, NC 27577-0884
PO BOX 885, SMITHFIELD, NC 27577-0885
PO BOX 886, SMITHFIELD, NC 27577-0886
PO BOX 887, SMITHFIELD, NC 27577-0887
PO BOX 888, SMITHFIELD, NC 27577-0888
PO BOX 889, SMITHFIELD, NC 27577-0889
PO BOX 890, SMITHFIELD, NC 27577-0890
PO BOX 891, SMITHFIELD, NC 27577-0891
PO BOX 892, SMITHFIELD, NC 27577-0892
PO BOX 893, SMITHFIELD, NC 27577-0893
PO BOX 894, SMITHFIELD, NC 27577-0894
PO BOX 895, SMITHFIELD, NC 27577-0895
PO BOX 896, SMITHFIELD, NC 27577-0896
PO BOX 897, SMITHFIELD, NC 27577-0897
PO BOX 898, SMITHFIELD, NC 27577-0898
PO BOX 899, SMITHFIELD, NC 27577-0899
PO BOX 900, SMITHFIELD, NC 27577-0900
PO BOX 901, SMITHFIELD, NC 27577-0901
PO BOX 902, SMITHFIELD, NC 27577-0902
PO BOX 903, SMITHFIELD, NC 27577-0903
PO BOX 904, SMITHFIELD, NC 27577-0904
PO BOX 905, SMITHFIELD, NC 27577-0905
PO BOX 906, SMITHFIELD, NC 27577-0906
PO BOX 907, SMITHFIELD, NC 27577-0907
PO BOX 908, SMITHFIELD, NC 27577-0908
PO BOX 909, SMITHFIELD, NC 27577-0909
PO BOX 910, SMITHFIELD, NC 27577-0910
PO BOX 911, SMITHFIELD, NC 27577-0911
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