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, DUNN, NC 28335-0721
PO BOX 722, DUNN, NC 28335-0722
PO BOX 723, DUNN, NC 28335-0723
PO BOX 724, DUNN, NC 28335-0724
PO BOX 725, DUNN, NC 28335-0725
PO BOX 726, DUNN, NC 28335-0726
PO BOX 727, DUNN, NC 28335-0727
PO BOX 728, DUNN, NC 28335-0728
PO BOX 729, DUNN, NC 28335-0729
PO BOX 730, DUNN, NC 28335-0730
PO BOX 731, DUNN, NC 28335-0731
PO BOX 732, DUNN, NC 28335-0732
PO BOX 733, DUNN, NC 28335-0733
PO BOX 734, DUNN, NC 28335-0734
PO BOX 735, DUNN, NC 28335-0735
PO BOX 736, DUNN, NC 28335-0736
PO BOX 737, DUNN, NC 28335-0737
PO BOX 738, DUNN, NC 28335-0738
PO BOX 739, DUNN, NC 28335-0739
PO BOX 740, DUNN, NC 28335-0740
PO BOX 741, DUNN, NC 28335-0741
PO BOX 742, DUNN, NC 28335-0742
PO BOX 743, DUNN, NC 28335-0743
PO BOX 744, DUNN, NC 28335-0744
PO BOX 745, DUNN, NC 28335-0745
PO BOX 746, DUNN, NC 28335-0746
PO BOX 747, DUNN, NC 28335-0747
PO BOX 748, DUNN, NC 28335-0748
PO BOX 749, DUNN, NC 28335-0749
PO BOX 750, DUNN, NC 28335-0750
PO BOX 751, DUNN, NC 28335-0751
PO BOX 752, DUNN, NC 28335-0752
PO BOX 753, DUNN, NC 28335-0753
PO BOX 754, DUNN, NC 28335-0754
PO BOX 755, DUNN, NC 28335-0755
PO BOX 756, DUNN, NC 28335-0756
PO BOX 757, DUNN, NC 28335-0757
PO BOX 758, DUNN, NC 28335-0758
PO BOX 759, DUNN, NC 28335-0759
PO BOX 760, DUNN, NC 28335-0760
PO BOX 761, DUNN, NC 28335-0761
PO BOX 762, DUNN, NC 28335-0762
PO BOX 763, DUNN, NC 28335-0763
PO BOX 764, DUNN, NC 28335-0764
PO BOX 765, DUNN, NC 28335-0765
PO BOX 766, DUNN, NC 28335-0766
PO BOX 767, DUNN, NC 28335-0767
PO BOX 768, DUNN, NC 28335-0768
PO BOX 769, DUNN, NC 28335-0769
PO BOX 770, DUNN, NC 28335-0770
PO BOX 771, DUNN, NC 28335-0771
PO BOX 772, DUNN, NC 28335-0772
PO BOX 773, DUNN, NC 28335-0773
PO BOX 774, DUNN, NC 28335-0774
PO BOX 775, DUNN, NC 28335-0775
PO BOX 776, DUNN, NC 28335-0776
PO BOX 777, DUNN, NC 28335-0777
PO BOX 778, DUNN, NC 28335-0778
PO BOX 779, DUNN, NC 28335-0779
PO BOX 780, DUNN, NC 28335-0780
PO BOX 781, DUNN, NC 28335-0781
PO BOX 782, DUNN, NC 28335-0782
PO BOX 783, DUNN, NC 28335-0783
PO BOX 784, DUNN, NC 28335-0784
PO BOX 785, DUNN, NC 28335-0785
PO BOX 786, DUNN, NC 28335-0786
PO BOX 787, DUNN, NC 28335-0787
PO BOX 788, DUNN, NC 28335-0788
PO BOX 789, DUNN, NC 28335-0789
PO BOX 790, DUNN, NC 28335-0790
PO BOX 791, DUNN, NC 28335-0791
PO BOX 792, DUNN, NC 28335-0792
PO BOX 793, DUNN, NC 28335-0793
PO BOX 794, DUNN, NC 28335-0794
PO BOX 795, DUNN, NC 28335-0795
PO BOX 796, DUNN, NC 28335-0796
PO BOX 797, DUNN, NC 28335-0797
PO BOX 798, DUNN, NC 28335-0798
PO BOX 799, DUNN, NC 28335-0799
PO BOX 800, DUNN, NC 28335-0800
PO BOX 801, DUNN, NC 28335-0801
PO BOX 802, DUNN, NC 28335-0802
PO BOX 803, DUNN, NC 28335-0803
PO BOX 804, DUNN, NC 28335-0804
PO BOX 805, DUNN, NC 28335-0805
PO BOX 806, DUNN, NC 28335-0806
PO BOX 807, DUNN, NC 28335-0807
PO BOX 808, DUNN, NC 28335-0808
PO BOX 809, DUNN, NC 28335-0809
PO BOX 810, DUNN, NC 28335-0810
PO BOX 811, DUNN, NC 28335-0811
PO BOX 812, DUNN, NC 28335-0812
PO BOX 813, DUNN, NC 28335-0813
PO BOX 814, DUNN, NC 28335-0814
PO BOX 815, DUNN, NC 28335-0815
PO BOX 816, DUNN, NC 28335-0816
PO BOX 817, DUNN, NC 28335-0817
PO BOX 818, DUNN, NC 28335-0818
PO BOX 819, DUNN, NC 28335-0819
PO BOX 820, DUNN, NC 28335-0820
PO BOX 821, DUNN, NC 28335-0821
PO BOX 822, DUNN, NC 28335-0822
PO BOX 823, DUNN, NC 28335-0823
PO BOX 824, DUNN, NC 28335-0824
PO BOX 825, DUNN, NC 28335-0825
PO BOX 826, DUNN, NC 28335-0826
PO BOX 827, DUNN, NC 28335-0827
PO BOX 828, DUNN, NC 28335-0828
PO BOX 829, DUNN, NC 28335-0829
PO BOX 830, DUNN, NC 28335-0830
PO BOX 831, DUNN, NC 28335-0831
PO BOX 832, DUNN, NC 28335-0832
PO BOX 833, DUNN, NC 28335-0833
PO BOX 834, DUNN, NC 28335-0834
PO BOX 835, DUNN, NC 28335-0835
PO BOX 836, DUNN, NC 28335-0836
PO BOX 837, DUNN, NC 28335-0837
PO BOX 838, DUNN, NC 28335-0838
PO BOX 839, DUNN, NC 28335-0839
PO BOX 840, DUNN, NC 28335-0840
PO BOX 841, DUNN, NC 28335-0841
PO BOX 842, DUNN, NC 28335-0842
PO BOX 843, DUNN, NC 28335-0843
PO BOX 844, DUNN, NC 28335-0844
PO BOX 845, DUNN, NC 28335-0845
PO BOX 846, DUNN, NC 28335-0846
PO BOX 847, DUNN, NC 28335-0847
PO BOX 848, DUNN, NC 28335-0848
PO BOX 849, DUNN, NC 28335-0849
PO BOX 850, DUNN, NC 28335-0850
PO BOX 851, DUNN, NC 28335-0851
PO BOX 852, DUNN, NC 28335-0852
PO BOX 853, DUNN, NC 28335-0853
PO BOX 854, DUNN, NC 28335-0854
PO BOX 855, DUNN, NC 28335-0855
PO BOX 856, DUNN, NC 28335-0856
PO BOX 857, DUNN, NC 28335-0857
PO BOX 858, DUNN, NC 28335-0858
PO BOX 859, DUNN, NC 28335-0859
PO BOX 860, DUNN, NC 28335-0860
PO BOX 861, DUNN, NC 28335-0861
PO BOX 862, DUNN, NC 28335-0862
PO BOX 863, DUNN, NC 28335-0863
PO BOX 864, DUNN, NC 28335-0864
PO BOX 865, DUNN, NC 28335-0865
PO BOX 866, DUNN, NC 28335-0866
PO BOX 867, DUNN, NC 28335-0867
PO BOX 868, DUNN, NC 28335-0868
PO BOX 869, DUNN, NC 28335-0869
PO BOX 870, DUNN, NC 28335-0870
PO BOX 871, DUNN, NC 28335-0871
PO BOX 872, DUNN, NC 28335-0872
PO BOX 873, DUNN, NC 28335-0873
PO BOX 874, DUNN, NC 28335-0874
PO BOX 875, DUNN, NC 28335-0875
PO BOX 876, DUNN, NC 28335-0876
PO BOX 877, DUNN, NC 28335-0877
PO BOX 878, DUNN, NC 28335-0878
PO BOX 879, DUNN, NC 28335-0879
PO BOX 880, DUNN, NC 28335-0880
PO BOX 881, DUNN, NC 28335-0881
PO BOX 882, DUNN, NC 28335-0882
PO BOX 883, DUNN, NC 28335-0883
PO BOX 884, DUNN, NC 28335-0884
PO BOX 885, DUNN, NC 28335-0885
PO BOX 886, DUNN, NC 28335-0886
PO BOX 887, DUNN, NC 28335-0887
PO BOX 888, DUNN, NC 28335-0888
PO BOX 889, DUNN, NC 28335-0889
PO BOX 890, DUNN, NC 28335-0890
PO BOX 891, DUNN, NC 28335-0891
PO BOX 892, DUNN, NC 28335-0892
PO BOX 893, DUNN, NC 28335-0893
PO BOX 894, DUNN, NC 28335-0894
PO BOX 895, DUNN, NC 28335-0895
PO BOX 896, DUNN, NC 28335-0896
PO BOX 897, DUNN, NC 28335-0897
PO BOX 898, DUNN, NC 28335-0898
PO BOX 899, DUNN, NC 28335-0899
PO BOX 900, DUNN, NC 28335-0900
PO BOX 901, DUNN, NC 28335-0901
PO BOX 902, DUNN, NC 28335-0902
PO BOX 903, DUNN, NC 28335-0903
PO BOX 904, DUNN, NC 28335-0904
PO BOX 905, DUNN, NC 28335-0905
PO BOX 906, DUNN, NC 28335-0906
PO BOX 907, DUNN, NC 28335-0907
PO BOX 908, DUNN, NC 28335-0908
PO BOX 909, DUNN, NC 28335-0909
PO BOX 910, DUNN, NC 28335-0910
PO BOX 911, DUNN, NC 28335-0911
PO BOX 912, DUNN, NC 28335-0912
PO BOX 913, DUNN, NC 28335-0913
PO BOX 914, DUNN, NC 28335-0914
PO BOX 915, DUNN, NC 28335-0915
PO BOX 916, DUNN, NC 28335-0916
PO BOX 917, DUNN, NC 28335-0917
PO BOX 918, DUNN, NC 28335-0918
PO BOX 919, DUNN, NC 28335-0919
PO BOX 920, DUNN, NC 28335-0920
PO BOX 921, DUNN, NC 28335-0921
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