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 60601, PALO ALTO, CA 94306-0601
PO BOX 60602, PALO ALTO, CA 94306-0602
PO BOX 60603, PALO ALTO, CA 94306-0603
PO BOX 60604, PALO ALTO, CA 94306-0604
PO BOX 60605, PALO ALTO, CA 94306-0605
PO BOX 60606, PALO ALTO, CA 94306-0606
PO BOX 60607, PALO ALTO, CA 94306-0607
PO BOX 60608, PALO ALTO, CA 94306-0608
PO BOX 60609, PALO ALTO, CA 94306-0609
PO BOX 60610, PALO ALTO, CA 94306-0610
PO BOX 60611, PALO ALTO, CA 94306-0611
PO BOX 60612, PALO ALTO, CA 94306-0612
PO BOX 60613, PALO ALTO, CA 94306-0613
PO BOX 60614, PALO ALTO, CA 94306-0614
PO BOX 60615, PALO ALTO, CA 94306-0615
PO BOX 60616, PALO ALTO, CA 94306-0616
PO BOX 60617, PALO ALTO, CA 94306-0617
PO BOX 60618, PALO ALTO, CA 94306-0618
PO BOX 60619, PALO ALTO, CA 94306-0619
PO BOX 60620, PALO ALTO, CA 94306-0620
PO BOX 60621, PALO ALTO, CA 94306-0621
PO BOX 60622, PALO ALTO, CA 94306-0622
PO BOX 60623, PALO ALTO, CA 94306-0623
PO BOX 60624, PALO ALTO, CA 94306-0624
PO BOX 60625, PALO ALTO, CA 94306-0625
PO BOX 60626, PALO ALTO, CA 94306-0626
PO BOX 60627, PALO ALTO, CA 94306-0627
PO BOX 60628, PALO ALTO, CA 94306-0628
PO BOX 60629, PALO ALTO, CA 94306-0629
PO BOX 60630, PALO ALTO, CA 94306-0630
PO BOX 60631, PALO ALTO, CA 94306-0631
PO BOX 60632, PALO ALTO, CA 94306-0632
PO BOX 60633, PALO ALTO, CA 94306-0633
PO BOX 60634, PALO ALTO, CA 94306-0634
PO BOX 60635, PALO ALTO, CA 94306-0635
PO BOX 60636, PALO ALTO, CA 94306-0636
PO BOX 60637, PALO ALTO, CA 94306-0637
PO BOX 60638, PALO ALTO, CA 94306-0638
PO BOX 60639, PALO ALTO, CA 94306-0639
PO BOX 60640, PALO ALTO, CA 94306-0640
PO BOX 60641, PALO ALTO, CA 94306-0641
PO BOX 60642, PALO ALTO, CA 94306-0642
PO BOX 60643, PALO ALTO, CA 94306-0643
PO BOX 60644, PALO ALTO, CA 94306-0644
PO BOX 60645, PALO ALTO, CA 94306-0645
PO BOX 60646, PALO ALTO, CA 94306-0646
PO BOX 60647, PALO ALTO, CA 94306-0647
PO BOX 60648, PALO ALTO, CA 94306-0648
PO BOX 60649, PALO ALTO, CA 94306-0649
PO BOX 60650, PALO ALTO, CA 94306-0650
PO BOX 60651, PALO ALTO, CA 94306-0651
PO BOX 60652, PALO ALTO, CA 94306-0652
PO BOX 60653, PALO ALTO, CA 94306-0653
PO BOX 60654, PALO ALTO, CA 94306-0654
PO BOX 60655, PALO ALTO, CA 94306-0655
PO BOX 60656, PALO ALTO, CA 94306-0656
PO BOX 60657, PALO ALTO, CA 94306-0657
PO BOX 60658, PALO ALTO, CA 94306-0658
PO BOX 60659, PALO ALTO, CA 94306-0659
PO BOX 60660, PALO ALTO, CA 94306-0660
PO BOX 60661, PALO ALTO, CA 94306-0661
PO BOX 60662, PALO ALTO, CA 94306-0662
PO BOX 60663, PALO ALTO, CA 94306-0663
PO BOX 60664, PALO ALTO, CA 94306-0664
PO BOX 60665, PALO ALTO, CA 94306-0665
PO BOX 60666, PALO ALTO, CA 94306-0666
PO BOX 60667, PALO ALTO, CA 94306-0667
PO BOX 60668, PALO ALTO, CA 94306-0668
PO BOX 60669, PALO ALTO, CA 94306-0669
PO BOX 60670, PALO ALTO, CA 94306-0670
PO BOX 60671, PALO ALTO, CA 94306-0671
PO BOX 60672, PALO ALTO, CA 94306-0672
PO BOX 60673, PALO ALTO, CA 94306-0673
PO BOX 60674, PALO ALTO, CA 94306-0674
PO BOX 60675, PALO ALTO, CA 94306-0675
PO BOX 60676, PALO ALTO, CA 94306-0676
PO BOX 60677, PALO ALTO, CA 94306-0677
PO BOX 60678, PALO ALTO, CA 94306-0678
PO BOX 60679, PALO ALTO, CA 94306-0679
PO BOX 60680, PALO ALTO, CA 94306-0680
PO BOX 60681, PALO ALTO, CA 94306-0681
PO BOX 60682, PALO ALTO, CA 94306-0682
PO BOX 60683, PALO ALTO, CA 94306-0683
PO BOX 60684, PALO ALTO, CA 94306-0684
PO BOX 60685, PALO ALTO, CA 94306-0685
PO BOX 60686, PALO ALTO, CA 94306-0686
PO BOX 60687, PALO ALTO, CA 94306-0687
PO BOX 60688, PALO ALTO, CA 94306-0688
PO BOX 60689, PALO ALTO, CA 94306-0689
PO BOX 60690, PALO ALTO, CA 94306-0690
PO BOX 60691, PALO ALTO, CA 94306-0691
PO BOX 60692, PALO ALTO, CA 94306-0692
PO BOX 60693, PALO ALTO, CA 94306-0693
PO BOX 60694, PALO ALTO, CA 94306-0694
PO BOX 60695, PALO ALTO, CA 94306-0695
PO BOX 60696, PALO ALTO, CA 94306-0696
PO BOX 60697, PALO ALTO, CA 94306-0697
PO BOX 60698, PALO ALTO, CA 94306-0698
PO BOX 60699, PALO ALTO, CA 94306-0699
PO BOX 60700, PALO ALTO, CA 94306-0700
PO BOX 60701, PALO ALTO, CA 94306-0701
PO BOX 60702, PALO ALTO, CA 94306-0702
PO BOX 60703, PALO ALTO, CA 94306-0703
PO BOX 60704, PALO ALTO, CA 94306-0704
PO BOX 60705, PALO ALTO, CA 94306-0705
PO BOX 60706, PALO ALTO, CA 94306-0706
PO BOX 60707, PALO ALTO, CA 94306-0707
PO BOX 60708, PALO ALTO, CA 94306-0708
PO BOX 60709, PALO ALTO, CA 94306-0709
PO BOX 60710, PALO ALTO, CA 94306-0710
PO BOX 60711, PALO ALTO, CA 94306-0711
PO BOX 60712, PALO ALTO, CA 94306-0712
PO BOX 60713, PALO ALTO, CA 94306-0713
PO BOX 60714, PALO ALTO, CA 94306-0714
PO BOX 60715, PALO ALTO, CA 94306-0715
PO BOX 60716, PALO ALTO, CA 94306-0716
PO BOX 60717, PALO ALTO, CA 94306-0717
PO BOX 60718, PALO ALTO, CA 94306-0718
PO BOX 60719, PALO ALTO, CA 94306-0719
PO BOX 60720, PALO ALTO, CA 94306-0720
PO BOX 60721, PALO ALTO, CA 94306-0721
PO BOX 60722, PALO ALTO, CA 94306-0722
PO BOX 60723, PALO ALTO, CA 94306-0723
PO BOX 60724, PALO ALTO, CA 94306-0724
PO BOX 60725, PALO ALTO, CA 94306-0725
PO BOX 60726, PALO ALTO, CA 94306-0726
PO BOX 60727, PALO ALTO, CA 94306-0727
PO BOX 60728, PALO ALTO, CA 94306-0728
PO BOX 60729, PALO ALTO, CA 94306-0729
PO BOX 60730, PALO ALTO, CA 94306-0730
PO BOX 60731, PALO ALTO, CA 94306-0731
PO BOX 60732, PALO ALTO, CA 94306-0732
PO BOX 60733, PALO ALTO, CA 94306-0733
PO BOX 60734, PALO ALTO, CA 94306-0734
PO BOX 60735, PALO ALTO, CA 94306-0735
PO BOX 60736, PALO ALTO, CA 94306-0736
PO BOX 60737, PALO ALTO, CA 94306-0737
PO BOX 60738, PALO ALTO, CA 94306-0738
PO BOX 60739, PALO ALTO, CA 94306-0739
PO BOX 60740, PALO ALTO, CA 94306-0740
PO BOX 60741, PALO ALTO, CA 94306-0741
PO BOX 60742, PALO ALTO, CA 94306-0742
PO BOX 60743, PALO ALTO, CA 94306-0743
PO BOX 60744, PALO ALTO, CA 94306-0744
PO BOX 60745, PALO ALTO, CA 94306-0745
PO BOX 60746, PALO ALTO, CA 94306-0746
PO BOX 60747, PALO ALTO, CA 94306-0747
PO BOX 60748, PALO ALTO, CA 94306-0748
PO BOX 60749, PALO ALTO, CA 94306-0749
PO BOX 60750, PALO ALTO, CA 94306-0750
PO BOX 60751, PALO ALTO, CA 94306-0751
PO BOX 60752, PALO ALTO, CA 94306-0752
PO BOX 60753, PALO ALTO, CA 94306-0753
PO BOX 60754, PALO ALTO, CA 94306-0754
PO BOX 60755, PALO ALTO, CA 94306-0755
PO BOX 60756, PALO ALTO, CA 94306-0756
PO BOX 60757, PALO ALTO, CA 94306-0757
PO BOX 60758, PALO ALTO, CA 94306-0758
PO BOX 60759, PALO ALTO, CA 94306-0759
PO BOX 60760, PALO ALTO, CA 94306-0760
PO BOX 60761, PALO ALTO, CA 94306-0761
PO BOX 60762, PALO ALTO, CA 94306-0762
PO BOX 60763, PALO ALTO, CA 94306-0763
PO BOX 60764, PALO ALTO, CA 94306-0764
PO BOX 60765, PALO ALTO, CA 94306-0765
PO BOX 60766, PALO ALTO, CA 94306-0766
PO BOX 60767, PALO ALTO, CA 94306-0767
PO BOX 60768, PALO ALTO, CA 94306-0768
PO BOX 60769, PALO ALTO, CA 94306-0769
PO BOX 60770, PALO ALTO, CA 94306-0770
PO BOX 60771, PALO ALTO, CA 94306-0771
PO BOX 60772, PALO ALTO, CA 94306-0772
PO BOX 60773, PALO ALTO, CA 94306-0773
PO BOX 60774, PALO ALTO, CA 94306-0774
PO BOX 60775, PALO ALTO, CA 94306-0775
PO BOX 60776, PALO ALTO, CA 94306-0776
PO BOX 60777, PALO ALTO, CA 94306-0777
PO BOX 60778, PALO ALTO, CA 94306-0778
PO BOX 60779, PALO ALTO, CA 94306-0779
PO BOX 60780, PALO ALTO, CA 94306-0780
PO BOX 60781, PALO ALTO, CA 94306-0781
PO BOX 60782, PALO ALTO, CA 94306-0782
PO BOX 60783, PALO ALTO, CA 94306-0783
PO BOX 60784, PALO ALTO, CA 94306-0784
PO BOX 60785, PALO ALTO, CA 94306-0785
PO BOX 60786, PALO ALTO, CA 94306-0786
PO BOX 60787, PALO ALTO, CA 94306-0787
PO BOX 60788, PALO ALTO, CA 94306-0788
PO BOX 60789, PALO ALTO, CA 94306-0789
PO BOX 60790, PALO ALTO, CA 94306-0790
PO BOX 60791, PALO ALTO, CA 94306-0791
PO BOX 60792, PALO ALTO, CA 94306-0792
PO BOX 60793, PALO ALTO, CA 94306-0793
PO BOX 60794, PALO ALTO, CA 94306-0794
PO BOX 60795, PALO ALTO, CA 94306-0795
PO BOX 60796, PALO ALTO, CA 94306-0796
PO BOX 60797, PALO ALTO, CA 94306-0797
PO BOX 60798, PALO ALTO, CA 94306-0798
PO BOX 60799, PALO ALTO, CA 94306-0799
PO BOX 60800, PALO ALTO, CA 94306-0800
PO BOX 60801, PALO ALTO, CA 94306-0801
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