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 910601, SAN DIEGO, CA 92191-0601
PO BOX 910602, SAN DIEGO, CA 92191-0602
PO BOX 910603, SAN DIEGO, CA 92191-0603
PO BOX 910604, SAN DIEGO, CA 92191-0604
PO BOX 910605, SAN DIEGO, CA 92191-0605
PO BOX 910606, SAN DIEGO, CA 92191-0606
PO BOX 910607, SAN DIEGO, CA 92191-0607
PO BOX 910608, SAN DIEGO, CA 92191-0608
PO BOX 910609, SAN DIEGO, CA 92191-0609
PO BOX 910610, SAN DIEGO, CA 92191-0610
PO BOX 910611, SAN DIEGO, CA 92191-0611
PO BOX 910612, SAN DIEGO, CA 92191-0612
PO BOX 910613, SAN DIEGO, CA 92191-0613
PO BOX 910614, SAN DIEGO, CA 92191-0614
PO BOX 910615, SAN DIEGO, CA 92191-0615
PO BOX 910616, SAN DIEGO, CA 92191-0616
PO BOX 910617, SAN DIEGO, CA 92191-0617
PO BOX 910618, SAN DIEGO, CA 92191-0618
PO BOX 910619, SAN DIEGO, CA 92191-0619
PO BOX 910620, SAN DIEGO, CA 92191-0620
PO BOX 910621, SAN DIEGO, CA 92191-0621
PO BOX 910622, SAN DIEGO, CA 92191-0622
PO BOX 910623, SAN DIEGO, CA 92191-0623
PO BOX 910624, SAN DIEGO, CA 92191-0624
PO BOX 910625, SAN DIEGO, CA 92191-0625
PO BOX 910626, SAN DIEGO, CA 92191-0626
PO BOX 910627, SAN DIEGO, CA 92191-0627
PO BOX 910628, SAN DIEGO, CA 92191-0628
PO BOX 910629, SAN DIEGO, CA 92191-0629
PO BOX 910630, SAN DIEGO, CA 92191-0630
PO BOX 910631, SAN DIEGO, CA 92191-0631
PO BOX 910632, SAN DIEGO, CA 92191-0632
PO BOX 910633, SAN DIEGO, CA 92191-0633
PO BOX 910634, SAN DIEGO, CA 92191-0634
PO BOX 910635, SAN DIEGO, CA 92191-0635
PO BOX 910636, SAN DIEGO, CA 92191-0636
PO BOX 910637, SAN DIEGO, CA 92191-0637
PO BOX 910638, SAN DIEGO, CA 92191-0638
PO BOX 910639, SAN DIEGO, CA 92191-0639
PO BOX 910640, SAN DIEGO, CA 92191-0640
PO BOX 910641, SAN DIEGO, CA 92191-0641
PO BOX 910642, SAN DIEGO, CA 92191-0642
PO BOX 910643, SAN DIEGO, CA 92191-0643
PO BOX 910644, SAN DIEGO, CA 92191-0644
PO BOX 910645, SAN DIEGO, CA 92191-0645
PO BOX 910646, SAN DIEGO, CA 92191-0646
PO BOX 910647, SAN DIEGO, CA 92191-0647
PO BOX 910648, SAN DIEGO, CA 92191-0648
PO BOX 910649, SAN DIEGO, CA 92191-0649
PO BOX 910650, SAN DIEGO, CA 92191-0650
PO BOX 910651, SAN DIEGO, CA 92191-0651
PO BOX 910652, SAN DIEGO, CA 92191-0652
PO BOX 910653, SAN DIEGO, CA 92191-0653
PO BOX 910654, SAN DIEGO, CA 92191-0654
PO BOX 910655, SAN DIEGO, CA 92191-0655
PO BOX 910656, SAN DIEGO, CA 92191-0656
PO BOX 910657, SAN DIEGO, CA 92191-0657
PO BOX 910658, SAN DIEGO, CA 92191-0658
PO BOX 910659, SAN DIEGO, CA 92191-0659
PO BOX 910660, SAN DIEGO, CA 92191-0660
PO BOX 910661, SAN DIEGO, CA 92191-0661
PO BOX 910662, SAN DIEGO, CA 92191-0662
PO BOX 910663, SAN DIEGO, CA 92191-0663
PO BOX 910664, SAN DIEGO, CA 92191-0664
PO BOX 910665, SAN DIEGO, CA 92191-0665
PO BOX 910666, SAN DIEGO, CA 92191-0666
PO BOX 910667, SAN DIEGO, CA 92191-0667
PO BOX 910668, SAN DIEGO, CA 92191-0668
PO BOX 910669, SAN DIEGO, CA 92191-0669
PO BOX 910670, SAN DIEGO, CA 92191-0670
PO BOX 910671, SAN DIEGO, CA 92191-0671
PO BOX 910672, SAN DIEGO, CA 92191-0672
PO BOX 910673, SAN DIEGO, CA 92191-0673
PO BOX 910674, SAN DIEGO, CA 92191-0674
PO BOX 910675, SAN DIEGO, CA 92191-0675
PO BOX 910676, SAN DIEGO, CA 92191-0676
PO BOX 910677, SAN DIEGO, CA 92191-0677
PO BOX 910678, SAN DIEGO, CA 92191-0678
PO BOX 910679, SAN DIEGO, CA 92191-0679
PO BOX 910680, SAN DIEGO, CA 92191-0680
PO BOX 910681, SAN DIEGO, CA 92191-0681
PO BOX 910682, SAN DIEGO, CA 92191-0682
PO BOX 910683, SAN DIEGO, CA 92191-0683
PO BOX 910684, SAN DIEGO, CA 92191-0684
PO BOX 910685, SAN DIEGO, CA 92191-0685
PO BOX 910686, SAN DIEGO, CA 92191-0686
PO BOX 910687, SAN DIEGO, CA 92191-0687
PO BOX 910688, SAN DIEGO, CA 92191-0688
PO BOX 910689, SAN DIEGO, CA 92191-0689
PO BOX 910690, SAN DIEGO, CA 92191-0690
PO BOX 910691, SAN DIEGO, CA 92191-0691
PO BOX 910692, SAN DIEGO, CA 92191-0692
PO BOX 910693, SAN DIEGO, CA 92191-0693
PO BOX 910694, SAN DIEGO, CA 92191-0694
PO BOX 910695, SAN DIEGO, CA 92191-0695
PO BOX 910696, SAN DIEGO, CA 92191-0696
PO BOX 910697, SAN DIEGO, CA 92191-0697
PO BOX 910698, SAN DIEGO, CA 92191-0698
PO BOX 910699, SAN DIEGO, CA 92191-0699
PO BOX 910700, SAN DIEGO, CA 92191-0700
PO BOX 910701, SAN DIEGO, CA 92191-0701
PO BOX 910702, SAN DIEGO, CA 92191-0702
PO BOX 910703, SAN DIEGO, CA 92191-0703
PO BOX 910704, SAN DIEGO, CA 92191-0704
PO BOX 910705, SAN DIEGO, CA 92191-0705
PO BOX 910706, SAN DIEGO, CA 92191-0706
PO BOX 910707, SAN DIEGO, CA 92191-0707
PO BOX 910708, SAN DIEGO, CA 92191-0708
PO BOX 910709, SAN DIEGO, CA 92191-0709
PO BOX 910710, SAN DIEGO, CA 92191-0710
PO BOX 910711, SAN DIEGO, CA 92191-0711
PO BOX 910712, SAN DIEGO, CA 92191-0712
PO BOX 910713, SAN DIEGO, CA 92191-0713
PO BOX 910714, SAN DIEGO, CA 92191-0714
PO BOX 910715, SAN DIEGO, CA 92191-0715
PO BOX 910716, SAN DIEGO, CA 92191-0716
PO BOX 910717, SAN DIEGO, CA 92191-0717
PO BOX 910718, SAN DIEGO, CA 92191-0718
PO BOX 910719, SAN DIEGO, CA 92191-0719
PO BOX 910720, SAN DIEGO, CA 92191-0720
PO BOX 910721, SAN DIEGO, CA 92191-0721
PO BOX 910722, SAN DIEGO, CA 92191-0722
PO BOX 910723, SAN DIEGO, CA 92191-0723
PO BOX 910724, SAN DIEGO, CA 92191-0724
PO BOX 910725, SAN DIEGO, CA 92191-0725
PO BOX 910726, SAN DIEGO, CA 92191-0726
PO BOX 910727, SAN DIEGO, CA 92191-0727
PO BOX 910728, SAN DIEGO, CA 92191-0728
PO BOX 910729, SAN DIEGO, CA 92191-0729
PO BOX 910730, SAN DIEGO, CA 92191-0730
PO BOX 910731, SAN DIEGO, CA 92191-0731
PO BOX 910732, SAN DIEGO, CA 92191-0732
PO BOX 910733, SAN DIEGO, CA 92191-0733
PO BOX 910734, SAN DIEGO, CA 92191-0734
PO BOX 910735, SAN DIEGO, CA 92191-0735
PO BOX 910736, SAN DIEGO, CA 92191-0736
PO BOX 910737, SAN DIEGO, CA 92191-0737
PO BOX 910738, SAN DIEGO, CA 92191-0738
PO BOX 910739, SAN DIEGO, CA 92191-0739
PO BOX 910740, SAN DIEGO, CA 92191-0740
PO BOX 910741, SAN DIEGO, CA 92191-0741
PO BOX 910742, SAN DIEGO, CA 92191-0742
PO BOX 910743, SAN DIEGO, CA 92191-0743
PO BOX 910744, SAN DIEGO, CA 92191-0744
PO BOX 910745, SAN DIEGO, CA 92191-0745
PO BOX 910746, SAN DIEGO, CA 92191-0746
PO BOX 910747, SAN DIEGO, CA 92191-0747
PO BOX 910748, SAN DIEGO, CA 92191-0748
PO BOX 910749, SAN DIEGO, CA 92191-0749
PO BOX 910750, SAN DIEGO, CA 92191-0750
PO BOX 910751, SAN DIEGO, CA 92191-0751
PO BOX 910752, SAN DIEGO, CA 92191-0752
PO BOX 910753, SAN DIEGO, CA 92191-0753
PO BOX 910754, SAN DIEGO, CA 92191-0754
PO BOX 910755, SAN DIEGO, CA 92191-0755
PO BOX 910756, SAN DIEGO, CA 92191-0756
PO BOX 910757, SAN DIEGO, CA 92191-0757
PO BOX 910758, SAN DIEGO, CA 92191-0758
PO BOX 910759, SAN DIEGO, CA 92191-0759
PO BOX 910760, SAN DIEGO, CA 92191-0760
PO BOX 910761, SAN DIEGO, CA 92191-0761
PO BOX 910762, SAN DIEGO, CA 92191-0762
PO BOX 910763, SAN DIEGO, CA 92191-0763
PO BOX 910764, SAN DIEGO, CA 92191-0764
PO BOX 910765, SAN DIEGO, CA 92191-0765
PO BOX 910766, SAN DIEGO, CA 92191-0766
PO BOX 910767, SAN DIEGO, CA 92191-0767
PO BOX 910768, SAN DIEGO, CA 92191-0768
PO BOX 910769, SAN DIEGO, CA 92191-0769
PO BOX 910770, SAN DIEGO, CA 92191-0770
PO BOX 910771, SAN DIEGO, CA 92191-0771
PO BOX 910772, SAN DIEGO, CA 92191-0772
PO BOX 910773, SAN DIEGO, CA 92191-0773
PO BOX 910774, SAN DIEGO, CA 92191-0774
PO BOX 910775, SAN DIEGO, CA 92191-0775
PO BOX 910776, SAN DIEGO, CA 92191-0776
PO BOX 910777, SAN DIEGO, CA 92191-0777
PO BOX 910778, SAN DIEGO, CA 92191-0778
PO BOX 910779, SAN DIEGO, CA 92191-0779
PO BOX 910780, SAN DIEGO, CA 92191-0780
PO BOX 910781, SAN DIEGO, CA 92191-0781
PO BOX 910782, SAN DIEGO, CA 92191-0782
PO BOX 910783, SAN DIEGO, CA 92191-0783
PO BOX 910784, SAN DIEGO, CA 92191-0784
PO BOX 910785, SAN DIEGO, CA 92191-0785
PO BOX 910786, SAN DIEGO, CA 92191-0786
PO BOX 910787, SAN DIEGO, CA 92191-0787
PO BOX 910788, SAN DIEGO, CA 92191-0788
PO BOX 910789, SAN DIEGO, CA 92191-0789
PO BOX 910790, SAN DIEGO, CA 92191-0790
PO BOX 910791, SAN DIEGO, CA 92191-0791
PO BOX 910792, SAN DIEGO, CA 92191-0792
PO BOX 910793, SAN DIEGO, CA 92191-0793
PO BOX 910794, SAN DIEGO, CA 92191-0794
PO BOX 910795, SAN DIEGO, CA 92191-0795
PO BOX 910796, SAN DIEGO, CA 92191-0796
PO BOX 910797, SAN DIEGO, CA 92191-0797
PO BOX 910798, SAN DIEGO, CA 92191-0798
PO BOX 910799, SAN DIEGO, CA 92191-0799
PO BOX 910800, SAN DIEGO, CA 92191-0800
PO BOX 910801, SAN DIEGO, CA 92191-0801
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