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 28601, SAN DIEGO, CA 92198-0601
PO BOX 28602, SAN DIEGO, CA 92198-0602
PO BOX 28603, SAN DIEGO, CA 92198-0603
PO BOX 28604, SAN DIEGO, CA 92198-0604
PO BOX 28605, SAN DIEGO, CA 92198-0605
PO BOX 28606, SAN DIEGO, CA 92198-0606
PO BOX 28607, SAN DIEGO, CA 92198-0607
PO BOX 28608, SAN DIEGO, CA 92198-0608
PO BOX 28609, SAN DIEGO, CA 92198-0609
PO BOX 28610, SAN DIEGO, CA 92198-0610
PO BOX 28611, SAN DIEGO, CA 92198-0611
PO BOX 28612, SAN DIEGO, CA 92198-0612
PO BOX 28613, SAN DIEGO, CA 92198-0613
PO BOX 28614, SAN DIEGO, CA 92198-0614
PO BOX 28615, SAN DIEGO, CA 92198-0615
PO BOX 28616, SAN DIEGO, CA 92198-0616
PO BOX 28617, SAN DIEGO, CA 92198-0617
PO BOX 28618, SAN DIEGO, CA 92198-0618
PO BOX 28619, SAN DIEGO, CA 92198-0619
PO BOX 28620, SAN DIEGO, CA 92198-0620
PO BOX 28621, SAN DIEGO, CA 92198-0621
PO BOX 28622, SAN DIEGO, CA 92198-0622
PO BOX 28623, SAN DIEGO, CA 92198-0623
PO BOX 28624, SAN DIEGO, CA 92198-0624
PO BOX 28625, SAN DIEGO, CA 92198-0625
PO BOX 28626, SAN DIEGO, CA 92198-0626
PO BOX 28627, SAN DIEGO, CA 92198-0627
PO BOX 28628, SAN DIEGO, CA 92198-0628
PO BOX 28629, SAN DIEGO, CA 92198-0629
PO BOX 28630, SAN DIEGO, CA 92198-0630
PO BOX 28631, SAN DIEGO, CA 92198-0631
PO BOX 28632, SAN DIEGO, CA 92198-0632
PO BOX 28633, SAN DIEGO, CA 92198-0633
PO BOX 28634, SAN DIEGO, CA 92198-0634
PO BOX 28635, SAN DIEGO, CA 92198-0635
PO BOX 28636, SAN DIEGO, CA 92198-0636
PO BOX 28637, SAN DIEGO, CA 92198-0637
PO BOX 28638, SAN DIEGO, CA 92198-0638
PO BOX 28639, SAN DIEGO, CA 92198-0639
PO BOX 28640, SAN DIEGO, CA 92198-0640
PO BOX 28641, SAN DIEGO, CA 92198-0641
PO BOX 28642, SAN DIEGO, CA 92198-0642
PO BOX 28643, SAN DIEGO, CA 92198-0643
PO BOX 28644, SAN DIEGO, CA 92198-0644
PO BOX 28645, SAN DIEGO, CA 92198-0645
PO BOX 28646, SAN DIEGO, CA 92198-0646
PO BOX 28647, SAN DIEGO, CA 92198-0647
PO BOX 28648, SAN DIEGO, CA 92198-0648
PO BOX 28649, SAN DIEGO, CA 92198-0649
PO BOX 28650, SAN DIEGO, CA 92198-0650
PO BOX 28651, SAN DIEGO, CA 92198-0651
PO BOX 28652, SAN DIEGO, CA 92198-0652
PO BOX 28653, SAN DIEGO, CA 92198-0653
PO BOX 28654, SAN DIEGO, CA 92198-0654
PO BOX 28655, SAN DIEGO, CA 92198-0655
PO BOX 28656, SAN DIEGO, CA 92198-0656
PO BOX 28657, SAN DIEGO, CA 92198-0657
PO BOX 28658, SAN DIEGO, CA 92198-0658
PO BOX 28659, SAN DIEGO, CA 92198-0659
PO BOX 28660, SAN DIEGO, CA 92198-0660
PO BOX 28661, SAN DIEGO, CA 92198-0661
PO BOX 28662, SAN DIEGO, CA 92198-0662
PO BOX 28663, SAN DIEGO, CA 92198-0663
PO BOX 28664, SAN DIEGO, CA 92198-0664
PO BOX 28665, SAN DIEGO, CA 92198-0665
PO BOX 28666, SAN DIEGO, CA 92198-0666
PO BOX 28667, SAN DIEGO, CA 92198-0667
PO BOX 28668, SAN DIEGO, CA 92198-0668
PO BOX 28669, SAN DIEGO, CA 92198-0669
PO BOX 28670, SAN DIEGO, CA 92198-0670
PO BOX 28671, SAN DIEGO, CA 92198-0671
PO BOX 28672, SAN DIEGO, CA 92198-0672
PO BOX 28673, SAN DIEGO, CA 92198-0673
PO BOX 28674, SAN DIEGO, CA 92198-0674
PO BOX 28675, SAN DIEGO, CA 92198-0675
PO BOX 28676, SAN DIEGO, CA 92198-0676
PO BOX 28677, SAN DIEGO, CA 92198-0677
PO BOX 28678, SAN DIEGO, CA 92198-0678
PO BOX 28679, SAN DIEGO, CA 92198-0679
PO BOX 28680, SAN DIEGO, CA 92198-0680
PO BOX 28681, SAN DIEGO, CA 92198-0681
PO BOX 28682, SAN DIEGO, CA 92198-0682
PO BOX 28683, SAN DIEGO, CA 92198-0683
PO BOX 28684, SAN DIEGO, CA 92198-0684
PO BOX 28685, SAN DIEGO, CA 92198-0685
PO BOX 28686, SAN DIEGO, CA 92198-0686
PO BOX 28687, SAN DIEGO, CA 92198-0687
PO BOX 28688, SAN DIEGO, CA 92198-0688
PO BOX 28689, SAN DIEGO, CA 92198-0689
PO BOX 28690, SAN DIEGO, CA 92198-0690
PO BOX 28691, SAN DIEGO, CA 92198-0691
PO BOX 28692, SAN DIEGO, CA 92198-0692
PO BOX 28693, SAN DIEGO, CA 92198-0693
PO BOX 28694, SAN DIEGO, CA 92198-0694
PO BOX 28695, SAN DIEGO, CA 92198-0695
PO BOX 28696, SAN DIEGO, CA 92198-0696
PO BOX 28697, SAN DIEGO, CA 92198-0697
PO BOX 28698, SAN DIEGO, CA 92198-0698
PO BOX 28699, SAN DIEGO, CA 92198-0699
PO BOX 28700, SAN DIEGO, CA 92198-0700
PO BOX 28701, SAN DIEGO, CA 92198-0701
PO BOX 28702, SAN DIEGO, CA 92198-0702
PO BOX 28703, SAN DIEGO, CA 92198-0703
PO BOX 28704, SAN DIEGO, CA 92198-0704
PO BOX 28705, SAN DIEGO, CA 92198-0705
PO BOX 28706, SAN DIEGO, CA 92198-0706
PO BOX 28707, SAN DIEGO, CA 92198-0707
PO BOX 28708, SAN DIEGO, CA 92198-0708
PO BOX 28709, SAN DIEGO, CA 92198-0709
PO BOX 28710, SAN DIEGO, CA 92198-0710
PO BOX 28711, SAN DIEGO, CA 92198-0711
PO BOX 28712, SAN DIEGO, CA 92198-0712
PO BOX 28713, SAN DIEGO, CA 92198-0713
PO BOX 28714, SAN DIEGO, CA 92198-0714
PO BOX 28715, SAN DIEGO, CA 92198-0715
PO BOX 28716, SAN DIEGO, CA 92198-0716
PO BOX 28717, SAN DIEGO, CA 92198-0717
PO BOX 28718, SAN DIEGO, CA 92198-0718
PO BOX 28719, SAN DIEGO, CA 92198-0719
PO BOX 28720, SAN DIEGO, CA 92198-0720
PO BOX 28721, SAN DIEGO, CA 92198-0721
PO BOX 28722, SAN DIEGO, CA 92198-0722
PO BOX 28723, SAN DIEGO, CA 92198-0723
PO BOX 28724, SAN DIEGO, CA 92198-0724
PO BOX 28725, SAN DIEGO, CA 92198-0725
PO BOX 28726, SAN DIEGO, CA 92198-0726
PO BOX 28727, SAN DIEGO, CA 92198-0727
PO BOX 28728, SAN DIEGO, CA 92198-0728
PO BOX 28729, SAN DIEGO, CA 92198-0729
PO BOX 28730, SAN DIEGO, CA 92198-0730
PO BOX 28731, SAN DIEGO, CA 92198-0731
PO BOX 28732, SAN DIEGO, CA 92198-0732
PO BOX 28733, SAN DIEGO, CA 92198-0733
PO BOX 28734, SAN DIEGO, CA 92198-0734
PO BOX 28735, SAN DIEGO, CA 92198-0735
PO BOX 28736, SAN DIEGO, CA 92198-0736
PO BOX 28737, SAN DIEGO, CA 92198-0737
PO BOX 28738, SAN DIEGO, CA 92198-0738
PO BOX 28739, SAN DIEGO, CA 92198-0739
PO BOX 28740, SAN DIEGO, CA 92198-0740
PO BOX 28741, SAN DIEGO, CA 92198-0741
PO BOX 28742, SAN DIEGO, CA 92198-0742
PO BOX 28743, SAN DIEGO, CA 92198-0743
PO BOX 28744, SAN DIEGO, CA 92198-0744
PO BOX 28745, SAN DIEGO, CA 92198-0745
PO BOX 28746, SAN DIEGO, CA 92198-0746
PO BOX 28747, SAN DIEGO, CA 92198-0747
PO BOX 28748, SAN DIEGO, CA 92198-0748
PO BOX 28749, SAN DIEGO, CA 92198-0749
PO BOX 28750, SAN DIEGO, CA 92198-0750
PO BOX 28751, SAN DIEGO, CA 92198-0751
PO BOX 28752, SAN DIEGO, CA 92198-0752
PO BOX 28753, SAN DIEGO, CA 92198-0753
PO BOX 28754, SAN DIEGO, CA 92198-0754
PO BOX 28755, SAN DIEGO, CA 92198-0755
PO BOX 28756, SAN DIEGO, CA 92198-0756
PO BOX 28757, SAN DIEGO, CA 92198-0757
PO BOX 28758, SAN DIEGO, CA 92198-0758
PO BOX 28759, SAN DIEGO, CA 92198-0759
PO BOX 28760, SAN DIEGO, CA 92198-0760
PO BOX 28761, SAN DIEGO, CA 92198-0761
PO BOX 28762, SAN DIEGO, CA 92198-0762
PO BOX 28763, SAN DIEGO, CA 92198-0763
PO BOX 28764, SAN DIEGO, CA 92198-0764
PO BOX 28765, SAN DIEGO, CA 92198-0765
PO BOX 28766, SAN DIEGO, CA 92198-0766
PO BOX 28767, SAN DIEGO, CA 92198-0767
PO BOX 28768, SAN DIEGO, CA 92198-0768
PO BOX 28769, SAN DIEGO, CA 92198-0769
PO BOX 28770, SAN DIEGO, CA 92198-0770
PO BOX 28771, SAN DIEGO, CA 92198-0771
PO BOX 28772, SAN DIEGO, CA 92198-0772
PO BOX 28773, SAN DIEGO, CA 92198-0773
PO BOX 28774, SAN DIEGO, CA 92198-0774
PO BOX 28775, SAN DIEGO, CA 92198-0775
PO BOX 28776, SAN DIEGO, CA 92198-0776
PO BOX 28777, SAN DIEGO, CA 92198-0777
PO BOX 28778, SAN DIEGO, CA 92198-0778
PO BOX 28779, SAN DIEGO, CA 92198-0779
PO BOX 28780, SAN DIEGO, CA 92198-0780
PO BOX 28781, SAN DIEGO, CA 92198-0781
PO BOX 28782, SAN DIEGO, CA 92198-0782
PO BOX 28783, SAN DIEGO, CA 92198-0783
PO BOX 28784, SAN DIEGO, CA 92198-0784
PO BOX 28785, SAN DIEGO, CA 92198-0785
PO BOX 28786, SAN DIEGO, CA 92198-0786
PO BOX 28787, SAN DIEGO, CA 92198-0787
PO BOX 28788, SAN DIEGO, CA 92198-0788
PO BOX 28789, SAN DIEGO, CA 92198-0789
PO BOX 28790, SAN DIEGO, CA 92198-0790
PO BOX 28791, SAN DIEGO, CA 92198-0791
PO BOX 28792, SAN DIEGO, CA 92198-0792
PO BOX 28793, SAN DIEGO, CA 92198-0793
PO BOX 28794, SAN DIEGO, CA 92198-0794
PO BOX 28795, SAN DIEGO, CA 92198-0795
PO BOX 28796, SAN DIEGO, CA 92198-0796
PO BOX 28797, SAN DIEGO, CA 92198-0797
PO BOX 28798, SAN DIEGO, CA 92198-0798
PO BOX 28799, SAN DIEGO, CA 92198-0799
PO BOX 28800, SAN DIEGO, CA 92198-0800
PO BOX 28801, SAN DIEGO, CA 92198-0801
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