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 34700, ALEXANDRIA, VA 22334-0700
PO BOX 34701, ALEXANDRIA, VA 22334-0701
PO BOX 34702, ALEXANDRIA, VA 22334-0702
PO BOX 34703, ALEXANDRIA, VA 22334-0703
PO BOX 34704, ALEXANDRIA, VA 22334-0704
PO BOX 34705, ALEXANDRIA, VA 22334-0705
PO BOX 34706, ALEXANDRIA, VA 22334-0706
PO BOX 34707, ALEXANDRIA, VA 22334-0707
PO BOX 34708, ALEXANDRIA, VA 22334-0708
PO BOX 34709, ALEXANDRIA, VA 22334-0709
PO BOX 34710, ALEXANDRIA, VA 22334-0710
PO BOX 34711, ALEXANDRIA, VA 22334-0711
PO BOX 34712, ALEXANDRIA, VA 22334-0712
PO BOX 34713, ALEXANDRIA, VA 22334-0713
PO BOX 34714, ALEXANDRIA, VA 22334-0714
PO BOX 34715, ALEXANDRIA, VA 22334-0715
PO BOX 34716, ALEXANDRIA, VA 22334-0716
PO BOX 34717, ALEXANDRIA, VA 22334-0717
PO BOX 34718, ALEXANDRIA, VA 22334-0718
PO BOX 34719, ALEXANDRIA, VA 22334-0719
PO BOX 34720, ALEXANDRIA, VA 22334-0720
PO BOX 34721, ALEXANDRIA, VA 22334-0721
PO BOX 34722, ALEXANDRIA, VA 22334-0722
PO BOX 34723, ALEXANDRIA, VA 22334-0723
PO BOX 34724, ALEXANDRIA, VA 22334-0724
PO BOX 34725, ALEXANDRIA, VA 22334-0725
PO BOX 34726, ALEXANDRIA, VA 22334-0726
PO BOX 34727, ALEXANDRIA, VA 22334-0727
PO BOX 34728, ALEXANDRIA, VA 22334-0728
PO BOX 34729, ALEXANDRIA, VA 22334-0729
PO BOX 34730, ALEXANDRIA, VA 22334-0730
PO BOX 34731, ALEXANDRIA, VA 22334-0731
PO BOX 34732, ALEXANDRIA, VA 22334-0732
PO BOX 34733, ALEXANDRIA, VA 22334-0733
PO BOX 34734, ALEXANDRIA, VA 22334-0734
PO BOX 34735, ALEXANDRIA, VA 22334-0735
PO BOX 34736, ALEXANDRIA, VA 22334-0736
PO BOX 34737, ALEXANDRIA, VA 22334-0737
PO BOX 34738, ALEXANDRIA, VA 22334-0738
PO BOX 34739, ALEXANDRIA, VA 22334-0739
PO BOX 34740, ALEXANDRIA, VA 22334-0740
PO BOX 34741, ALEXANDRIA, VA 22334-0741
PO BOX 34742, ALEXANDRIA, VA 22334-0742
PO BOX 34743, ALEXANDRIA, VA 22334-0743
PO BOX 34744, ALEXANDRIA, VA 22334-0744
PO BOX 34745, ALEXANDRIA, VA 22334-0745
PO BOX 34746, ALEXANDRIA, VA 22334-0746
PO BOX 34747, ALEXANDRIA, VA 22334-0747
PO BOX 34748, ALEXANDRIA, VA 22334-0748
PO BOX 34749, ALEXANDRIA, VA 22334-0749
PO BOX 34750, ALEXANDRIA, VA 22334-0750
PO BOX 34751, ALEXANDRIA, VA 22334-0751
PO BOX 34752, ALEXANDRIA, VA 22334-0752
PO BOX 34753, ALEXANDRIA, VA 22334-0753
PO BOX 34754, ALEXANDRIA, VA 22334-0754
PO BOX 34755, ALEXANDRIA, VA 22334-0755
PO BOX 34756, ALEXANDRIA, VA 22334-0756
PO BOX 34757, ALEXANDRIA, VA 22334-0757
PO BOX 34758, ALEXANDRIA, VA 22334-0758
PO BOX 34759, ALEXANDRIA, VA 22334-0759
PO BOX 34760, ALEXANDRIA, VA 22334-0760
PO BOX 34761, ALEXANDRIA, VA 22334-0761
PO BOX 34762, ALEXANDRIA, VA 22334-0762
PO BOX 34763, ALEXANDRIA, VA 22334-0763
PO BOX 34764, ALEXANDRIA, VA 22334-0764
PO BOX 34765, ALEXANDRIA, VA 22334-0765
PO BOX 34766, ALEXANDRIA, VA 22334-0766
PO BOX 34767, ALEXANDRIA, VA 22334-0767
PO BOX 34768, ALEXANDRIA, VA 22334-0768
PO BOX 34769, ALEXANDRIA, VA 22334-0769
PO BOX 34770, ALEXANDRIA, VA 22334-0770
PO BOX 34771, ALEXANDRIA, VA 22334-0771
PO BOX 34772, ALEXANDRIA, VA 22334-0772
PO BOX 34773, ALEXANDRIA, VA 22334-0773
PO BOX 34774, ALEXANDRIA, VA 22334-0774
PO BOX 34775, ALEXANDRIA, VA 22334-0775
PO BOX 34776, ALEXANDRIA, VA 22334-0776
PO BOX 34777, ALEXANDRIA, VA 22334-0777
PO BOX 34778, ALEXANDRIA, VA 22334-0778
PO BOX 34779, ALEXANDRIA, VA 22334-0779
PO BOX 34780, ALEXANDRIA, VA 22334-0780
PO BOX 34781, ALEXANDRIA, VA 22334-0781
PO BOX 34782, ALEXANDRIA, VA 22334-0782
PO BOX 34783, ALEXANDRIA, VA 22334-0783
PO BOX 34784, ALEXANDRIA, VA 22334-0784
PO BOX 34785, ALEXANDRIA, VA 22334-0785
PO BOX 34786, ALEXANDRIA, VA 22334-0786
PO BOX 34787, ALEXANDRIA, VA 22334-0787
PO BOX 34788, ALEXANDRIA, VA 22334-0788
PO BOX 34789, ALEXANDRIA, VA 22334-0789
PO BOX 34790, ALEXANDRIA, VA 22334-0790
PO BOX 34791, ALEXANDRIA, VA 22334-0791
PO BOX 34792, ALEXANDRIA, VA 22334-0792
PO BOX 34793, ALEXANDRIA, VA 22334-0793
PO BOX 34794, ALEXANDRIA, VA 22334-0794
PO BOX 34795, ALEXANDRIA, VA 22334-0795
PO BOX 34796, ALEXANDRIA, VA 22334-0796
PO BOX 34797, ALEXANDRIA, VA 22334-0797
PO BOX 34798, ALEXANDRIA, VA 22334-0798
PO BOX 34799, ALEXANDRIA, VA 22334-0799
PO BOX 34800, ALEXANDRIA, VA 22334-0800
PO BOX 34801, ALEXANDRIA, VA 22334-0801
PO BOX 34802, ALEXANDRIA, VA 22334-0802
PO BOX 34803, ALEXANDRIA, VA 22334-0803
PO BOX 34804, ALEXANDRIA, VA 22334-0804
PO BOX 34805, ALEXANDRIA, VA 22334-0805
PO BOX 34806, ALEXANDRIA, VA 22334-0806
PO BOX 34807, ALEXANDRIA, VA 22334-0807
PO BOX 34808, ALEXANDRIA, VA 22334-0808
PO BOX 34809, ALEXANDRIA, VA 22334-0809
PO BOX 34810, ALEXANDRIA, VA 22334-0810
PO BOX 34811, ALEXANDRIA, VA 22334-0811
PO BOX 34812, ALEXANDRIA, VA 22334-0812
PO BOX 34813, ALEXANDRIA, VA 22334-0813
PO BOX 34814, ALEXANDRIA, VA 22334-0814
PO BOX 34815, ALEXANDRIA, VA 22334-0815
PO BOX 34816, ALEXANDRIA, VA 22334-0816
PO BOX 34817, ALEXANDRIA, VA 22334-0817
PO BOX 34818, ALEXANDRIA, VA 22334-0818
PO BOX 34819, ALEXANDRIA, VA 22334-0819
PO BOX 34820, ALEXANDRIA, VA 22334-0820
PO BOX 34821, ALEXANDRIA, VA 22334-0821
PO BOX 34822, ALEXANDRIA, VA 22334-0822
PO BOX 34823, ALEXANDRIA, VA 22334-0823
PO BOX 34824, ALEXANDRIA, VA 22334-0824
PO BOX 34825, ALEXANDRIA, VA 22334-0825
PO BOX 34826, ALEXANDRIA, VA 22334-0826
PO BOX 34827, ALEXANDRIA, VA 22334-0827
PO BOX 34828, ALEXANDRIA, VA 22334-0828
PO BOX 34829, ALEXANDRIA, VA 22334-0829
PO BOX 34830, ALEXANDRIA, VA 22334-0830
PO BOX 34831, ALEXANDRIA, VA 22334-0831
PO BOX 34832, ALEXANDRIA, VA 22334-0832
PO BOX 34833, ALEXANDRIA, VA 22334-0833
PO BOX 34834, ALEXANDRIA, VA 22334-0834
PO BOX 34835, ALEXANDRIA, VA 22334-0835
PO BOX 34836, ALEXANDRIA, VA 22334-0836
PO BOX 34837, ALEXANDRIA, VA 22334-0837
PO BOX 34838, ALEXANDRIA, VA 22334-0838
PO BOX 34839, ALEXANDRIA, VA 22334-0839
PO BOX 34840, ALEXANDRIA, VA 22334-0840
PO BOX 34841, ALEXANDRIA, VA 22334-0841
PO BOX 34842, ALEXANDRIA, VA 22334-0842
PO BOX 34843, ALEXANDRIA, VA 22334-0843
PO BOX 34844, ALEXANDRIA, VA 22334-0844
PO BOX 34845, ALEXANDRIA, VA 22334-0845
PO BOX 34846, ALEXANDRIA, VA 22334-0846
PO BOX 34847, ALEXANDRIA, VA 22334-0847
PO BOX 34848, ALEXANDRIA, VA 22334-0848
PO BOX 34849, ALEXANDRIA, VA 22334-0849
PO BOX 34850, ALEXANDRIA, VA 22334-0850
PO BOX 34851, ALEXANDRIA, VA 22334-0851
PO BOX 34852, ALEXANDRIA, VA 22334-0852
PO BOX 34853, ALEXANDRIA, VA 22334-0853
PO BOX 34854, ALEXANDRIA, VA 22334-0854
PO BOX 34855, ALEXANDRIA, VA 22334-0855
PO BOX 34856, ALEXANDRIA, VA 22334-0856
PO BOX 34857, ALEXANDRIA, VA 22334-0857
PO BOX 34858, ALEXANDRIA, VA 22334-0858
PO BOX 34859, ALEXANDRIA, VA 22334-0859
PO BOX 34860, ALEXANDRIA, VA 22334-0860
PO BOX 34861, ALEXANDRIA, VA 22334-0861
PO BOX 34862, ALEXANDRIA, VA 22334-0862
PO BOX 34863, ALEXANDRIA, VA 22334-0863
PO BOX 34864, ALEXANDRIA, VA 22334-0864
PO BOX 34865, ALEXANDRIA, VA 22334-0865
PO BOX 34866, ALEXANDRIA, VA 22334-0866
PO BOX 34867, ALEXANDRIA, VA 22334-0867
PO BOX 34868, ALEXANDRIA, VA 22334-0868
PO BOX 34869, ALEXANDRIA, VA 22334-0869
PO BOX 34870, ALEXANDRIA, VA 22334-0870
PO BOX 34871, ALEXANDRIA, VA 22334-0871
PO BOX 34872, ALEXANDRIA, VA 22334-0872
PO BOX 34873, ALEXANDRIA, VA 22334-0873
PO BOX 34874, ALEXANDRIA, VA 22334-0874
PO BOX 34875, ALEXANDRIA, VA 22334-0875
PO BOX 34876, ALEXANDRIA, VA 22334-0876
PO BOX 34877, ALEXANDRIA, VA 22334-0877
PO BOX 34878, ALEXANDRIA, VA 22334-0878
PO BOX 34879, ALEXANDRIA, VA 22334-0879
PO BOX 34880, ALEXANDRIA, VA 22334-0880
PO BOX 34881, ALEXANDRIA, VA 22334-0881
PO BOX 34882, ALEXANDRIA, VA 22334-0882
PO BOX 34883, ALEXANDRIA, VA 22334-0883
PO BOX 34884, ALEXANDRIA, VA 22334-0884
PO BOX 34885, ALEXANDRIA, VA 22334-0885
PO BOX 34886, ALEXANDRIA, VA 22334-0886
PO BOX 34887, ALEXANDRIA, VA 22334-0887
PO BOX 34888, ALEXANDRIA, VA 22334-0888
PO BOX 34889, ALEXANDRIA, VA 22334-0889
PO BOX 34890, ALEXANDRIA, VA 22334-0890
PO BOX 34891, ALEXANDRIA, VA 22334-0891
PO BOX 34892, ALEXANDRIA, VA 22334-0892
PO BOX 34893, ALEXANDRIA, VA 22334-0893
PO BOX 34894, ALEXANDRIA, VA 22334-0894
PO BOX 34895, ALEXANDRIA, VA 22334-0895
PO BOX 34896, ALEXANDRIA, VA 22334-0896
PO BOX 34897, ALEXANDRIA, VA 22334-0897
PO BOX 34898, ALEXANDRIA, VA 22334-0898
PO BOX 34899, ALEXANDRIA, VA 22334-0899
PO BOX 34900, ALEXANDRIA, VA 22334-0900
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