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 430600, SAN YSIDRO, CA 92143-0600
PO BOX 430601, SAN YSIDRO, CA 92143-0601
PO BOX 430602, SAN YSIDRO, CA 92143-0602
PO BOX 430603, SAN YSIDRO, CA 92143-0603
PO BOX 430604, SAN YSIDRO, CA 92143-0604
PO BOX 430605, SAN YSIDRO, CA 92143-0605
PO BOX 430606, SAN YSIDRO, CA 92143-0606
PO BOX 430607, SAN YSIDRO, CA 92143-0607
PO BOX 430608, SAN YSIDRO, CA 92143-0608
PO BOX 430609, SAN YSIDRO, CA 92143-0609
PO BOX 430610, SAN YSIDRO, CA 92143-0610
PO BOX 430611, SAN YSIDRO, CA 92143-0611
PO BOX 430612, SAN YSIDRO, CA 92143-0612
PO BOX 430613, SAN YSIDRO, CA 92143-0613
PO BOX 430614, SAN YSIDRO, CA 92143-0614
PO BOX 430615, SAN YSIDRO, CA 92143-0615
PO BOX 430616, SAN YSIDRO, CA 92143-0616
PO BOX 430617, SAN YSIDRO, CA 92143-0617
PO BOX 430618, SAN YSIDRO, CA 92143-0618
PO BOX 430619, SAN YSIDRO, CA 92143-0619
PO BOX 430620, SAN YSIDRO, CA 92143-0620
PO BOX 430621, SAN YSIDRO, CA 92143-0621
PO BOX 430622, SAN YSIDRO, CA 92143-0622
PO BOX 430623, SAN YSIDRO, CA 92143-0623
PO BOX 430624, SAN YSIDRO, CA 92143-0624
PO BOX 430625, SAN YSIDRO, CA 92143-0625
PO BOX 430626, SAN YSIDRO, CA 92143-0626
PO BOX 430627, SAN YSIDRO, CA 92143-0627
PO BOX 430628, SAN YSIDRO, CA 92143-0628
PO BOX 430629, SAN YSIDRO, CA 92143-0629
PO BOX 430630, SAN YSIDRO, CA 92143-0630
PO BOX 430631, SAN YSIDRO, CA 92143-0631
PO BOX 430632, SAN YSIDRO, CA 92143-0632
PO BOX 430633, SAN YSIDRO, CA 92143-0633
PO BOX 430634, SAN YSIDRO, CA 92143-0634
PO BOX 430635, SAN YSIDRO, CA 92143-0635
PO BOX 430636, SAN YSIDRO, CA 92143-0636
PO BOX 430637, SAN YSIDRO, CA 92143-0637
PO BOX 430638, SAN YSIDRO, CA 92143-0638
PO BOX 430639, SAN YSIDRO, CA 92143-0639
PO BOX 430640, SAN YSIDRO, CA 92143-0640
PO BOX 430641, SAN YSIDRO, CA 92143-0641
PO BOX 430642, SAN YSIDRO, CA 92143-0642
PO BOX 430643, SAN YSIDRO, CA 92143-0643
PO BOX 430644, SAN YSIDRO, CA 92143-0644
PO BOX 430645, SAN YSIDRO, CA 92143-0645
PO BOX 430646, SAN YSIDRO, CA 92143-0646
PO BOX 430647, SAN YSIDRO, CA 92143-0647
PO BOX 430648, SAN YSIDRO, CA 92143-0648
PO BOX 430649, SAN YSIDRO, CA 92143-0649
PO BOX 430650, SAN YSIDRO, CA 92143-0650
PO BOX 430651, SAN YSIDRO, CA 92143-0651
PO BOX 430652, SAN YSIDRO, CA 92143-0652
PO BOX 430653, SAN YSIDRO, CA 92143-0653
PO BOX 430654, SAN YSIDRO, CA 92143-0654
PO BOX 430655, SAN YSIDRO, CA 92143-0655
PO BOX 430656, SAN YSIDRO, CA 92143-0656
PO BOX 430657, SAN YSIDRO, CA 92143-0657
PO BOX 430658, SAN YSIDRO, CA 92143-0658
PO BOX 430659, SAN YSIDRO, CA 92143-0659
PO BOX 430660, SAN YSIDRO, CA 92143-0660
PO BOX 430661, SAN YSIDRO, CA 92143-0661
PO BOX 430662, SAN YSIDRO, CA 92143-0662
PO BOX 430663, SAN YSIDRO, CA 92143-0663
PO BOX 430664, SAN YSIDRO, CA 92143-0664
PO BOX 430665, SAN YSIDRO, CA 92143-0665
PO BOX 430666, SAN YSIDRO, CA 92143-0666
PO BOX 430667, SAN YSIDRO, CA 92143-0667
PO BOX 430668, SAN YSIDRO, CA 92143-0668
PO BOX 430669, SAN YSIDRO, CA 92143-0669
PO BOX 430670, SAN YSIDRO, CA 92143-0670
PO BOX 430671, SAN YSIDRO, CA 92143-0671
PO BOX 430672, SAN YSIDRO, CA 92143-0672
PO BOX 430673, SAN YSIDRO, CA 92143-0673
PO BOX 430674, SAN YSIDRO, CA 92143-0674
PO BOX 430675, SAN YSIDRO, CA 92143-0675
PO BOX 430676, SAN YSIDRO, CA 92143-0676
PO BOX 430677, SAN YSIDRO, CA 92143-0677
PO BOX 430678, SAN YSIDRO, CA 92143-0678
PO BOX 430679, SAN YSIDRO, CA 92143-0679
PO BOX 430680, SAN YSIDRO, CA 92143-0680
PO BOX 430681, SAN YSIDRO, CA 92143-0681
PO BOX 430682, SAN YSIDRO, CA 92143-0682
PO BOX 430683, SAN YSIDRO, CA 92143-0683
PO BOX 430684, SAN YSIDRO, CA 92143-0684
PO BOX 430685, SAN YSIDRO, CA 92143-0685
PO BOX 430686, SAN YSIDRO, CA 92143-0686
PO BOX 430687, SAN YSIDRO, CA 92143-0687
PO BOX 430688, SAN YSIDRO, CA 92143-0688
PO BOX 430689, SAN YSIDRO, CA 92143-0689
PO BOX 430690, SAN YSIDRO, CA 92143-0690
PO BOX 430691, SAN YSIDRO, CA 92143-0691
PO BOX 430692, SAN YSIDRO, CA 92143-0692
PO BOX 430693, SAN YSIDRO, CA 92143-0693
PO BOX 430694, SAN YSIDRO, CA 92143-0694
PO BOX 430695, SAN YSIDRO, CA 92143-0695
PO BOX 430696, SAN YSIDRO, CA 92143-0696
PO BOX 430697, SAN YSIDRO, CA 92143-0697
PO BOX 430698, SAN YSIDRO, CA 92143-0698
PO BOX 430699, SAN YSIDRO, CA 92143-0699
PO BOX 430700, SAN YSIDRO, CA 92143-0700
PO BOX 430701, SAN YSIDRO, CA 92143-0701
PO BOX 430702, SAN YSIDRO, CA 92143-0702
PO BOX 430703, SAN YSIDRO, CA 92143-0703
PO BOX 430704, SAN YSIDRO, CA 92143-0704
PO BOX 430705, SAN YSIDRO, CA 92143-0705
PO BOX 430706, SAN YSIDRO, CA 92143-0706
PO BOX 430707, SAN YSIDRO, CA 92143-0707
PO BOX 430708, SAN YSIDRO, CA 92143-0708
PO BOX 430709, SAN YSIDRO, CA 92143-0709
PO BOX 430710, SAN YSIDRO, CA 92143-0710
PO BOX 430711, SAN YSIDRO, CA 92143-0711
PO BOX 430712, SAN YSIDRO, CA 92143-0712
PO BOX 430713, SAN YSIDRO, CA 92143-0713
PO BOX 430714, SAN YSIDRO, CA 92143-0714
PO BOX 430715, SAN YSIDRO, CA 92143-0715
PO BOX 430716, SAN YSIDRO, CA 92143-0716
PO BOX 430717, SAN YSIDRO, CA 92143-0717
PO BOX 430718, SAN YSIDRO, CA 92143-0718
PO BOX 430719, SAN YSIDRO, CA 92143-0719
PO BOX 430720, SAN YSIDRO, CA 92143-0720
PO BOX 430721, SAN YSIDRO, CA 92143-0721
PO BOX 430722, SAN YSIDRO, CA 92143-0722
PO BOX 430723, SAN YSIDRO, CA 92143-0723
PO BOX 430724, SAN YSIDRO, CA 92143-0724
PO BOX 430725, SAN YSIDRO, CA 92143-0725
PO BOX 430726, SAN YSIDRO, CA 92143-0726
PO BOX 430727, SAN YSIDRO, CA 92143-0727
PO BOX 430728, SAN YSIDRO, CA 92143-0728
PO BOX 430729, SAN YSIDRO, CA 92143-0729
PO BOX 430730, SAN YSIDRO, CA 92143-0730
PO BOX 430731, SAN YSIDRO, CA 92143-0731
PO BOX 430732, SAN YSIDRO, CA 92143-0732
PO BOX 430733, SAN YSIDRO, CA 92143-0733
PO BOX 430734, SAN YSIDRO, CA 92143-0734
PO BOX 430735, SAN YSIDRO, CA 92143-0735
PO BOX 430736, SAN YSIDRO, CA 92143-0736
PO BOX 430737, SAN YSIDRO, CA 92143-0737
PO BOX 430738, SAN YSIDRO, CA 92143-0738
PO BOX 430739, SAN YSIDRO, CA 92143-0739
PO BOX 430740, SAN YSIDRO, CA 92143-0740
PO BOX 430741, SAN YSIDRO, CA 92143-0741
PO BOX 430742, SAN YSIDRO, CA 92143-0742
PO BOX 430743, SAN YSIDRO, CA 92143-0743
PO BOX 430744, SAN YSIDRO, CA 92143-0744
PO BOX 430745, SAN YSIDRO, CA 92143-0745
PO BOX 430746, SAN YSIDRO, CA 92143-0746
PO BOX 430747, SAN YSIDRO, CA 92143-0747
PO BOX 430748, SAN YSIDRO, CA 92143-0748
PO BOX 430749, SAN YSIDRO, CA 92143-0749
PO BOX 430750, SAN YSIDRO, CA 92143-0750
PO BOX 430751, SAN YSIDRO, CA 92143-0751
PO BOX 430752, SAN YSIDRO, CA 92143-0752
PO BOX 430753, SAN YSIDRO, CA 92143-0753
PO BOX 430754, SAN YSIDRO, CA 92143-0754
PO BOX 430755, SAN YSIDRO, CA 92143-0755
PO BOX 430756, SAN YSIDRO, CA 92143-0756
PO BOX 430757, SAN YSIDRO, CA 92143-0757
PO BOX 430758, SAN YSIDRO, CA 92143-0758
PO BOX 430759, SAN YSIDRO, CA 92143-0759
PO BOX 430760, SAN YSIDRO, CA 92143-0760
PO BOX 430761, SAN YSIDRO, CA 92143-0761
PO BOX 430762, SAN YSIDRO, CA 92143-0762
PO BOX 430763, SAN YSIDRO, CA 92143-0763
PO BOX 430764, SAN YSIDRO, CA 92143-0764
PO BOX 430765, SAN YSIDRO, CA 92143-0765
PO BOX 430766, SAN YSIDRO, CA 92143-0766
PO BOX 430767, SAN YSIDRO, CA 92143-0767
PO BOX 430768, SAN YSIDRO, CA 92143-0768
PO BOX 430769, SAN YSIDRO, CA 92143-0769
PO BOX 430770, SAN YSIDRO, CA 92143-0770
PO BOX 430771, SAN YSIDRO, CA 92143-0771
PO BOX 430772, SAN YSIDRO, CA 92143-0772
PO BOX 430773, SAN YSIDRO, CA 92143-0773
PO BOX 430774, SAN YSIDRO, CA 92143-0774
PO BOX 430775, SAN YSIDRO, CA 92143-0775
PO BOX 430776, SAN YSIDRO, CA 92143-0776
PO BOX 430777, SAN YSIDRO, CA 92143-0777
PO BOX 430778, SAN YSIDRO, CA 92143-0778
PO BOX 430779, SAN YSIDRO, CA 92143-0779
PO BOX 430780, SAN YSIDRO, CA 92143-0780
PO BOX 430781, SAN YSIDRO, CA 92143-0781
PO BOX 430782, SAN YSIDRO, CA 92143-0782
PO BOX 430783, SAN YSIDRO, CA 92143-0783
PO BOX 430784, SAN YSIDRO, CA 92143-0784
PO BOX 430785, SAN YSIDRO, CA 92143-0785
PO BOX 430786, SAN YSIDRO, CA 92143-0786
PO BOX 430787, SAN YSIDRO, CA 92143-0787
PO BOX 430788, SAN YSIDRO, CA 92143-0788
PO BOX 430789, SAN YSIDRO, CA 92143-0789
PO BOX 430790, SAN YSIDRO, CA 92143-0790
PO BOX 430791, SAN YSIDRO, CA 92143-0791
PO BOX 430792, SAN YSIDRO, CA 92143-0792
PO BOX 430793, SAN YSIDRO, CA 92143-0793
PO BOX 430794, SAN YSIDRO, CA 92143-0794
PO BOX 430795, SAN YSIDRO, CA 92143-0795
PO BOX 430796, SAN YSIDRO, CA 92143-0796
PO BOX 430797, SAN YSIDRO, CA 92143-0797
PO BOX 430798, SAN YSIDRO, CA 92143-0798
PO BOX 430799, SAN YSIDRO, CA 92143-0799
PO BOX 430800, SAN YSIDRO, CA 92143-0800
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