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 100712, HOUSTON, TX 77212-0712
PO BOX 100713, HOUSTON, TX 77212-0713
PO BOX 100714, HOUSTON, TX 77212-0714
PO BOX 100715, HOUSTON, TX 77212-0715
PO BOX 100716, HOUSTON, TX 77212-0716
PO BOX 100717, HOUSTON, TX 77212-0717
PO BOX 100718, HOUSTON, TX 77212-0718
PO BOX 100719, HOUSTON, TX 77212-0719
PO BOX 100720, HOUSTON, TX 77212-0720
PO BOX 100721, HOUSTON, TX 77212-0721
PO BOX 100722, HOUSTON, TX 77212-0722
PO BOX 100723, HOUSTON, TX 77212-0723
PO BOX 100724, HOUSTON, TX 77212-0724
PO BOX 100725, HOUSTON, TX 77212-0725
PO BOX 100726, HOUSTON, TX 77212-0726
PO BOX 100727, HOUSTON, TX 77212-0727
PO BOX 100728, HOUSTON, TX 77212-0728
PO BOX 100729, HOUSTON, TX 77212-0729
PO BOX 100730, HOUSTON, TX 77212-0730
PO BOX 100731, HOUSTON, TX 77212-0731
PO BOX 100732, HOUSTON, TX 77212-0732
PO BOX 100733, HOUSTON, TX 77212-0733
PO BOX 100734, HOUSTON, TX 77212-0734
PO BOX 100735, HOUSTON, TX 77212-0735
PO BOX 100736, HOUSTON, TX 77212-0736
PO BOX 100737, HOUSTON, TX 77212-0737
PO BOX 100738, HOUSTON, TX 77212-0738
PO BOX 100739, HOUSTON, TX 77212-0739
PO BOX 100740, HOUSTON, TX 77212-0740
PO BOX 100741, HOUSTON, TX 77212-0741
PO BOX 100742, HOUSTON, TX 77212-0742
PO BOX 100743, HOUSTON, TX 77212-0743
PO BOX 100744, HOUSTON, TX 77212-0744
PO BOX 100745, HOUSTON, TX 77212-0745
PO BOX 100746, HOUSTON, TX 77212-0746
PO BOX 100747, HOUSTON, TX 77212-0747
PO BOX 100748, HOUSTON, TX 77212-0748
PO BOX 100749, HOUSTON, TX 77212-0749
PO BOX 100750, HOUSTON, TX 77212-0750
PO BOX 100751, HOUSTON, TX 77212-0751
PO BOX 100752, HOUSTON, TX 77212-0752
PO BOX 100753, HOUSTON, TX 77212-0753
PO BOX 100754, HOUSTON, TX 77212-0754
PO BOX 100755, HOUSTON, TX 77212-0755
PO BOX 100756, HOUSTON, TX 77212-0756
PO BOX 100757, HOUSTON, TX 77212-0757
PO BOX 100758, HOUSTON, TX 77212-0758
PO BOX 100759, HOUSTON, TX 77212-0759
PO BOX 100760, HOUSTON, TX 77212-0760
PO BOX 100761, HOUSTON, TX 77212-0761
PO BOX 100762, HOUSTON, TX 77212-0762
PO BOX 100763, HOUSTON, TX 77212-0763
PO BOX 100764, HOUSTON, TX 77212-0764
PO BOX 100765, HOUSTON, TX 77212-0765
PO BOX 100766, HOUSTON, TX 77212-0766
PO BOX 100767, HOUSTON, TX 77212-0767
PO BOX 100768, HOUSTON, TX 77212-0768
PO BOX 100769, HOUSTON, TX 77212-0769
PO BOX 100770, HOUSTON, TX 77212-0770
PO BOX 100771, HOUSTON, TX 77212-0771
PO BOX 100772, HOUSTON, TX 77212-0772
PO BOX 100773, HOUSTON, TX 77212-0773
PO BOX 100774, HOUSTON, TX 77212-0774
PO BOX 100775, HOUSTON, TX 77212-0775
PO BOX 100776, HOUSTON, TX 77212-0776
PO BOX 100777, HOUSTON, TX 77212-0777
PO BOX 100778, HOUSTON, TX 77212-0778
PO BOX 100779, HOUSTON, TX 77212-0779
PO BOX 100780, HOUSTON, TX 77212-0780
PO BOX 100781, HOUSTON, TX 77212-0781
PO BOX 100782, HOUSTON, TX 77212-0782
PO BOX 100783, HOUSTON, TX 77212-0783
PO BOX 100784, HOUSTON, TX 77212-0784
PO BOX 100785, HOUSTON, TX 77212-0785
PO BOX 100786, HOUSTON, TX 77212-0786
PO BOX 100787, HOUSTON, TX 77212-0787
PO BOX 100788, HOUSTON, TX 77212-0788
PO BOX 100789, HOUSTON, TX 77212-0789
PO BOX 100790, HOUSTON, TX 77212-0790
PO BOX 100791, HOUSTON, TX 77212-0791
PO BOX 100792, HOUSTON, TX 77212-0792
PO BOX 100793, HOUSTON, TX 77212-0793
PO BOX 100794, HOUSTON, TX 77212-0794
PO BOX 100795, HOUSTON, TX 77212-0795
PO BOX 100796, HOUSTON, TX 77212-0796
PO BOX 100797, HOUSTON, TX 77212-0797
PO BOX 100798, HOUSTON, TX 77212-0798
PO BOX 100799, HOUSTON, TX 77212-0799
PO BOX 100800, HOUSTON, TX 77212-0800
PO BOX 100801, HOUSTON, TX 77212-0801
PO BOX 100802, HOUSTON, TX 77212-0802
PO BOX 100803, HOUSTON, TX 77212-0803
PO BOX 100804, HOUSTON, TX 77212-0804
PO BOX 100805, HOUSTON, TX 77212-0805
PO BOX 100806, HOUSTON, TX 77212-0806
PO BOX 100807, HOUSTON, TX 77212-0807
PO BOX 100808, HOUSTON, TX 77212-0808
PO BOX 100809, HOUSTON, TX 77212-0809
PO BOX 100810, HOUSTON, TX 77212-0810
PO BOX 100811, HOUSTON, TX 77212-0811
PO BOX 100812, HOUSTON, TX 77212-0812
PO BOX 100813, HOUSTON, TX 77212-0813
PO BOX 100814, HOUSTON, TX 77212-0814
PO BOX 100815, HOUSTON, TX 77212-0815
PO BOX 100816, HOUSTON, TX 77212-0816
PO BOX 100817, HOUSTON, TX 77212-0817
PO BOX 100818, HOUSTON, TX 77212-0818
PO BOX 100819, HOUSTON, TX 77212-0819
PO BOX 100820, HOUSTON, TX 77212-0820
PO BOX 100821, HOUSTON, TX 77212-0821
PO BOX 100822, HOUSTON, TX 77212-0822
PO BOX 100823, HOUSTON, TX 77212-0823
PO BOX 100824, HOUSTON, TX 77212-0824
PO BOX 100825, HOUSTON, TX 77212-0825
PO BOX 100826, HOUSTON, TX 77212-0826
PO BOX 100827, HOUSTON, TX 77212-0827
PO BOX 100828, HOUSTON, TX 77212-0828
PO BOX 100829, HOUSTON, TX 77212-0829
PO BOX 100830, HOUSTON, TX 77212-0830
PO BOX 100831, HOUSTON, TX 77212-0831
PO BOX 100832, HOUSTON, TX 77212-0832
PO BOX 100833, HOUSTON, TX 77212-0833
PO BOX 100834, HOUSTON, TX 77212-0834
PO BOX 100835, HOUSTON, TX 77212-0835
PO BOX 100836, HOUSTON, TX 77212-0836
PO BOX 100837, HOUSTON, TX 77212-0837
PO BOX 100838, HOUSTON, TX 77212-0838
PO BOX 100839, HOUSTON, TX 77212-0839
PO BOX 100840, HOUSTON, TX 77212-0840
PO BOX 100841, HOUSTON, TX 77212-0841
PO BOX 100842, HOUSTON, TX 77212-0842
PO BOX 100843, HOUSTON, TX 77212-0843
PO BOX 100844, HOUSTON, TX 77212-0844
PO BOX 100845, HOUSTON, TX 77212-0845
PO BOX 100846, HOUSTON, TX 77212-0846
PO BOX 100847, HOUSTON, TX 77212-0847
PO BOX 100848, HOUSTON, TX 77212-0848
PO BOX 100849, HOUSTON, TX 77212-0849
PO BOX 100850, HOUSTON, TX 77212-0850
PO BOX 100851, HOUSTON, TX 77212-0851
PO BOX 100852, HOUSTON, TX 77212-0852
PO BOX 100853, HOUSTON, TX 77212-0853
PO BOX 100854, HOUSTON, TX 77212-0854
PO BOX 100855, HOUSTON, TX 77212-0855
PO BOX 100856, HOUSTON, TX 77212-0856
PO BOX 100857, HOUSTON, TX 77212-0857
PO BOX 100858, HOUSTON, TX 77212-0858
PO BOX 100859, HOUSTON, TX 77212-0859
PO BOX 100860, HOUSTON, TX 77212-0860
PO BOX 100861, HOUSTON, TX 77212-0861
PO BOX 100862, HOUSTON, TX 77212-0862
PO BOX 100863, HOUSTON, TX 77212-0863
PO BOX 100864, HOUSTON, TX 77212-0864
PO BOX 100865, HOUSTON, TX 77212-0865
PO BOX 100866, HOUSTON, TX 77212-0866
PO BOX 100867, HOUSTON, TX 77212-0867
PO BOX 100868, HOUSTON, TX 77212-0868
PO BOX 100869, HOUSTON, TX 77212-0869
PO BOX 100870, HOUSTON, TX 77212-0870
PO BOX 100871, HOUSTON, TX 77212-0871
PO BOX 100872, HOUSTON, TX 77212-0872
PO BOX 100873, HOUSTON, TX 77212-0873
PO BOX 100874, HOUSTON, TX 77212-0874
PO BOX 100875, HOUSTON, TX 77212-0875
PO BOX 100876, HOUSTON, TX 77212-0876
PO BOX 100877, HOUSTON, TX 77212-0877
PO BOX 100878, HOUSTON, TX 77212-0878
PO BOX 100879, HOUSTON, TX 77212-0879
PO BOX 100880, HOUSTON, TX 77212-0880
PO BOX 100881, HOUSTON, TX 77212-0881
PO BOX 100882, HOUSTON, TX 77212-0882
PO BOX 100883, HOUSTON, TX 77212-0883
PO BOX 100884, HOUSTON, TX 77212-0884
PO BOX 100885, HOUSTON, TX 77212-0885
PO BOX 100886, HOUSTON, TX 77212-0886
PO BOX 100887, HOUSTON, TX 77212-0887
PO BOX 100888, HOUSTON, TX 77212-0888
PO BOX 100889, HOUSTON, TX 77212-0889
PO BOX 100890, HOUSTON, TX 77212-0890
PO BOX 100891, HOUSTON, TX 77212-0891
PO BOX 100892, HOUSTON, TX 77212-0892
PO BOX 100893, HOUSTON, TX 77212-0893
PO BOX 100894, HOUSTON, TX 77212-0894
PO BOX 100895, HOUSTON, TX 77212-0895
PO BOX 100896, HOUSTON, TX 77212-0896
PO BOX 100897, HOUSTON, TX 77212-0897
PO BOX 100898, HOUSTON, TX 77212-0898
PO BOX 100899, HOUSTON, TX 77212-0899
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