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 830656, BIRMINGHAM, AL 35283-0656
PO BOX 830657, BIRMINGHAM, AL 35283-0657
PO BOX 830658, BIRMINGHAM, AL 35283-0658
PO BOX 830659, BIRMINGHAM, AL 35283-0659
PO BOX 830660, BIRMINGHAM, AL 35283-0660
PO BOX 830661, BIRMINGHAM, AL 35283-0661
PO BOX 830662, BIRMINGHAM, AL 35283-0662
PO BOX 830663, BIRMINGHAM, AL 35283-0663
PO BOX 830664, BIRMINGHAM, AL 35283-0664
PO BOX 830665, BIRMINGHAM, AL 35283-0665
PO BOX 830666, BIRMINGHAM, AL 35283-0666
PO BOX 830667, BIRMINGHAM, AL 35283-0667
PO BOX 830668, BIRMINGHAM, AL 35283-0668
PO BOX 830669, BIRMINGHAM, AL 35283-0669
PO BOX 830670, BIRMINGHAM, AL 35283-0670
PO BOX 830671, BIRMINGHAM, AL 35283-0671
PO BOX 830672, BIRMINGHAM, AL 35283-0672
PO BOX 830673, BIRMINGHAM, AL 35283-0673
PO BOX 830674, BIRMINGHAM, AL 35283-0674
PO BOX 830675, BIRMINGHAM, AL 35283-0675
PO BOX 830676, BIRMINGHAM, AL 35283-0676
PO BOX 830677, BIRMINGHAM, AL 35283-0677
PO BOX 830678, BIRMINGHAM, AL 35283-0678
PO BOX 830679, BIRMINGHAM, AL 35283-0679
PO BOX 830680, BIRMINGHAM, AL 35283-0680
PO BOX 830681, BIRMINGHAM, AL 35283-0681
PO BOX 830682, BIRMINGHAM, AL 35283-0682
PO BOX 830683, BIRMINGHAM, AL 35283-0683
PO BOX 830684, BIRMINGHAM, AL 35283-0684
PO BOX 830685, BIRMINGHAM, AL 35283-0685
PO BOX 830686, BIRMINGHAM, AL 35283-0686
PO BOX 830687, BIRMINGHAM, AL 35283-0687
PO BOX 830688, BIRMINGHAM, AL 35283-0688
PO BOX 830689, BIRMINGHAM, AL 35283-0689
PO BOX 830690, BIRMINGHAM, AL 35283-0690
PO BOX 830691, BIRMINGHAM, AL 35283-0691
PO BOX 830692, BIRMINGHAM, AL 35283-0692
PO BOX 830693, BIRMINGHAM, AL 35283-0693
PO BOX 830694, BIRMINGHAM, AL 35283-0694
PO BOX 830695, BIRMINGHAM, AL 35283-0695
PO BOX 830696, BIRMINGHAM, AL 35283-0696
PO BOX 830697, BIRMINGHAM, AL 35283-0697
PO BOX 830698, BIRMINGHAM, AL 35283-0698
PO BOX 830699, BIRMINGHAM, AL 35283-0699
PO BOX 830700, BIRMINGHAM, AL 35283-0700
PO BOX 830701, BIRMINGHAM, AL 35283-0701
PO BOX 830702, BIRMINGHAM, AL 35283-0702
PO BOX 830703, BIRMINGHAM, AL 35283-0703
PO BOX 830704, BIRMINGHAM, AL 35283-0704
PO BOX 830705, BIRMINGHAM, AL 35283-0705
PO BOX 830706, BIRMINGHAM, AL 35283-0706
PO BOX 830707, BIRMINGHAM, AL 35283-0707
PO BOX 830708, BIRMINGHAM, AL 35283-0708
PO BOX 830709, BIRMINGHAM, AL 35283-0709
PO BOX 830710, BIRMINGHAM, AL 35283-0710
PO BOX 830711, BIRMINGHAM, AL 35283-0711
PO BOX 830712, BIRMINGHAM, AL 35283-0712
PO BOX 830713, BIRMINGHAM, AL 35283-0713
PO BOX 830714, BIRMINGHAM, AL 35283-0714
PO BOX 830715, BIRMINGHAM, AL 35283-0715
PO BOX 830716, BIRMINGHAM, AL 35283-0716
PO BOX 830717, BIRMINGHAM, AL 35283-0717
PO BOX 830718, BIRMINGHAM, AL 35283-0718
PO BOX 830719, BIRMINGHAM, AL 35283-0719
PO BOX 830720, BIRMINGHAM, AL 35283-0720
PO BOX 830721, BIRMINGHAM, AL 35283-0721
PO BOX 830722, BIRMINGHAM, AL 35283-0722
PO BOX 830723, BIRMINGHAM, AL 35283-0723
PO BOX 830724, BIRMINGHAM, AL 35283-0724
PO BOX 830725, BIRMINGHAM, AL 35283-0725
PO BOX 830726, BIRMINGHAM, AL 35283-0726
PO BOX 830727, BIRMINGHAM, AL 35283-0727
PO BOX 830728, BIRMINGHAM, AL 35283-0728
PO BOX 830729, BIRMINGHAM, AL 35283-0729
PO BOX 830730, BIRMINGHAM, AL 35283-0730
PO BOX 830731, BIRMINGHAM, AL 35283-0731
PO BOX 830732, BIRMINGHAM, AL 35283-0732
PO BOX 830733, BIRMINGHAM, AL 35283-0733
PO BOX 830734, BIRMINGHAM, AL 35283-0734
PO BOX 830735, BIRMINGHAM, AL 35283-0735
PO BOX 830736, BIRMINGHAM, AL 35283-0736
PO BOX 830737, BIRMINGHAM, AL 35283-0737
PO BOX 830738, BIRMINGHAM, AL 35283-0738
PO BOX 830739, BIRMINGHAM, AL 35283-0739
PO BOX 830740, BIRMINGHAM, AL 35283-0740
PO BOX 830741, BIRMINGHAM, AL 35283-0741
PO BOX 830742, BIRMINGHAM, AL 35283-0742
PO BOX 830743, BIRMINGHAM, AL 35283-0743
PO BOX 830744, BIRMINGHAM, AL 35283-0744
PO BOX 830745, BIRMINGHAM, AL 35283-0745
PO BOX 830746, BIRMINGHAM, AL 35283-0746
PO BOX 830747, BIRMINGHAM, AL 35283-0747
PO BOX 830748, BIRMINGHAM, AL 35283-0748
PO BOX 830749, BIRMINGHAM, AL 35283-0749
PO BOX 830750, BIRMINGHAM, AL 35283-0750
PO BOX 830751, BIRMINGHAM, AL 35283-0751
PO BOX 830752, BIRMINGHAM, AL 35283-0752
PO BOX 830753, BIRMINGHAM, AL 35283-0753
PO BOX 830754, BIRMINGHAM, AL 35283-0754
PO BOX 830755, BIRMINGHAM, AL 35283-0755
PO BOX 830756, BIRMINGHAM, AL 35283-0756
PO BOX 830757, BIRMINGHAM, AL 35283-0757
PO BOX 830758, BIRMINGHAM, AL 35283-0758
PO BOX 830759, BIRMINGHAM, AL 35283-0759
PO BOX 830760, BIRMINGHAM, AL 35283-0760
PO BOX 830761, BIRMINGHAM, AL 35283-0761
PO BOX 830762, BIRMINGHAM, AL 35283-0762
PO BOX 830763, BIRMINGHAM, AL 35283-0763
PO BOX 830764, BIRMINGHAM, AL 35283-0764
PO BOX 830765, BIRMINGHAM, AL 35283-0765
PO BOX 830766, BIRMINGHAM, AL 35283-0766
PO BOX 830767, BIRMINGHAM, AL 35283-0767
PO BOX 830768, BIRMINGHAM, AL 35283-0768
PO BOX 830769, BIRMINGHAM, AL 35283-0769
PO BOX 830770, BIRMINGHAM, AL 35283-0770
PO BOX 830771, BIRMINGHAM, AL 35283-0771
PO BOX 830772, BIRMINGHAM, AL 35283-0772
PO BOX 830773, BIRMINGHAM, AL 35283-0773
PO BOX 830774, BIRMINGHAM, AL 35283-0774
PO BOX 830775, BIRMINGHAM, AL 35283-0775
PO BOX 830776, BIRMINGHAM, AL 35283-0776
PO BOX 830777, BIRMINGHAM, AL 35283-0777
PO BOX 830778, BIRMINGHAM, AL 35283-0778
PO BOX 830779, BIRMINGHAM, AL 35283-0779
PO BOX 830780, BIRMINGHAM, AL 35283-0780
PO BOX 830781, BIRMINGHAM, AL 35283-0781
PO BOX 830782, BIRMINGHAM, AL 35283-0782
PO BOX 830783, BIRMINGHAM, AL 35283-0783
PO BOX 830784, BIRMINGHAM, AL 35283-0784
PO BOX 830785, BIRMINGHAM, AL 35283-0785
PO BOX 830786, BIRMINGHAM, AL 35283-0786
PO BOX 830787, BIRMINGHAM, AL 35283-0787
PO BOX 830788, BIRMINGHAM, AL 35283-0788
PO BOX 830789, BIRMINGHAM, AL 35283-0789
PO BOX 830790, BIRMINGHAM, AL 35283-0790
PO BOX 830791, BIRMINGHAM, AL 35283-0791
PO BOX 830792, BIRMINGHAM, AL 35283-0792
PO BOX 830793, BIRMINGHAM, AL 35283-0793
PO BOX 830794, BIRMINGHAM, AL 35283-0794
PO BOX 830795, BIRMINGHAM, AL 35283-0795
PO BOX 830796, BIRMINGHAM, AL 35283-0796
PO BOX 830797, BIRMINGHAM, AL 35283-0797
PO BOX 830798, BIRMINGHAM, AL 35283-0798
PO BOX 830799, BIRMINGHAM, AL 35283-0799
PO BOX 830800, BIRMINGHAM, AL 35283-0800
PO BOX 830801, BIRMINGHAM, AL 35283-0801
PO BOX 830802, BIRMINGHAM, AL 35283-0802
PO BOX 830803, BIRMINGHAM, AL 35283-0803
PO BOX 830804, BIRMINGHAM, AL 35283-0804
PO BOX 830805, BIRMINGHAM, AL 35283-0805
PO BOX 830806, BIRMINGHAM, AL 35283-0806
PO BOX 830807, BIRMINGHAM, AL 35283-0807
PO BOX 830808, BIRMINGHAM, AL 35283-0808
PO BOX 830809, BIRMINGHAM, AL 35283-0809
PO BOX 830810, BIRMINGHAM, AL 35283-0810
PO BOX 830811, BIRMINGHAM, AL 35283-0811
PO BOX 830812, BIRMINGHAM, AL 35283-0812
PO BOX 830813, BIRMINGHAM, AL 35283-0813
PO BOX 830814, BIRMINGHAM, AL 35283-0814
PO BOX 830815, BIRMINGHAM, AL 35283-0815
PO BOX 830816, BIRMINGHAM, AL 35283-0816
PO BOX 830817, BIRMINGHAM, AL 35283-0817
PO BOX 830818, BIRMINGHAM, AL 35283-0818
PO BOX 830819, BIRMINGHAM, AL 35283-0819
PO BOX 830820, BIRMINGHAM, AL 35283-0820
PO BOX 830821, BIRMINGHAM, AL 35283-0821
PO BOX 830822, BIRMINGHAM, AL 35283-0822
PO BOX 830823, BIRMINGHAM, AL 35283-0823
PO BOX 830824, BIRMINGHAM, AL 35283-0824
PO BOX 830825, BIRMINGHAM, AL 35283-0825
PO BOX 830826, BIRMINGHAM, AL 35283-0826
PO BOX 830827, BIRMINGHAM, AL 35283-0827
PO BOX 830828, BIRMINGHAM, AL 35283-0828
PO BOX 830829, BIRMINGHAM, AL 35283-0829
PO BOX 830830, BIRMINGHAM, AL 35283-0830
PO BOX 830831, BIRMINGHAM, AL 35283-0831
PO BOX 830832, BIRMINGHAM, AL 35283-0832
PO BOX 830833, BIRMINGHAM, AL 35283-0833
PO BOX 830834, BIRMINGHAM, AL 35283-0834
PO BOX 830835, BIRMINGHAM, AL 35283-0835
PO BOX 830836, BIRMINGHAM, AL 35283-0836
PO BOX 830837, BIRMINGHAM, AL 35283-0837
PO BOX 830838, BIRMINGHAM, AL 35283-0838
PO BOX 830839, BIRMINGHAM, AL 35283-0839
PO BOX 830840, BIRMINGHAM, AL 35283-0840
PO BOX 830841, BIRMINGHAM, AL 35283-0841
PO BOX 830842, BIRMINGHAM, AL 35283-0842
PO BOX 830843, BIRMINGHAM, AL 35283-0843
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