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 13621, EDWARDSVILLE, KS 66113-0621
PO BOX 13622, EDWARDSVILLE, KS 66113-0622
PO BOX 13623, EDWARDSVILLE, KS 66113-0623
PO BOX 13624, EDWARDSVILLE, KS 66113-0624
PO BOX 13625, EDWARDSVILLE, KS 66113-0625
PO BOX 13626, EDWARDSVILLE, KS 66113-0626
PO BOX 13627, EDWARDSVILLE, KS 66113-0627
PO BOX 13628, EDWARDSVILLE, KS 66113-0628
PO BOX 13629, EDWARDSVILLE, KS 66113-0629
PO BOX 13630, EDWARDSVILLE, KS 66113-0630
PO BOX 13631, EDWARDSVILLE, KS 66113-0631
PO BOX 13632, EDWARDSVILLE, KS 66113-0632
PO BOX 13633, EDWARDSVILLE, KS 66113-0633
PO BOX 13634, EDWARDSVILLE, KS 66113-0634
PO BOX 13635, EDWARDSVILLE, KS 66113-0635
PO BOX 13636, EDWARDSVILLE, KS 66113-0636
PO BOX 13637, EDWARDSVILLE, KS 66113-0637
PO BOX 13638, EDWARDSVILLE, KS 66113-0638
PO BOX 13639, EDWARDSVILLE, KS 66113-0639
PO BOX 13640, EDWARDSVILLE, KS 66113-0640
PO BOX 13641, EDWARDSVILLE, KS 66113-0641
PO BOX 13642, EDWARDSVILLE, KS 66113-0642
PO BOX 13643, EDWARDSVILLE, KS 66113-0643
PO BOX 13644, EDWARDSVILLE, KS 66113-0644
PO BOX 13645, EDWARDSVILLE, KS 66113-0645
PO BOX 13646, EDWARDSVILLE, KS 66113-0646
PO BOX 13647, EDWARDSVILLE, KS 66113-0647
PO BOX 13648, EDWARDSVILLE, KS 66113-0648
PO BOX 13649, EDWARDSVILLE, KS 66113-0649
PO BOX 13650, EDWARDSVILLE, KS 66113-0650
PO BOX 13651, EDWARDSVILLE, KS 66113-0651
PO BOX 13652, EDWARDSVILLE, KS 66113-0652
PO BOX 13653, EDWARDSVILLE, KS 66113-0653
PO BOX 13654, EDWARDSVILLE, KS 66113-0654
PO BOX 13655, EDWARDSVILLE, KS 66113-0655
PO BOX 13656, EDWARDSVILLE, KS 66113-0656
PO BOX 13657, EDWARDSVILLE, KS 66113-0657
PO BOX 13658, EDWARDSVILLE, KS 66113-0658
PO BOX 13659, EDWARDSVILLE, KS 66113-0659
PO BOX 13660, EDWARDSVILLE, KS 66113-0660
PO BOX 13661, EDWARDSVILLE, KS 66113-0661
PO BOX 13662, EDWARDSVILLE, KS 66113-0662
PO BOX 13663, EDWARDSVILLE, KS 66113-0663
PO BOX 13664, EDWARDSVILLE, KS 66113-0664
PO BOX 13665, EDWARDSVILLE, KS 66113-0665
PO BOX 13666, EDWARDSVILLE, KS 66113-0666
PO BOX 13667, EDWARDSVILLE, KS 66113-0667
PO BOX 13668, EDWARDSVILLE, KS 66113-0668
PO BOX 13669, EDWARDSVILLE, KS 66113-0669
PO BOX 13670, EDWARDSVILLE, KS 66113-0670
PO BOX 13671, EDWARDSVILLE, KS 66113-0671
PO BOX 13672, EDWARDSVILLE, KS 66113-0672
PO BOX 13673, EDWARDSVILLE, KS 66113-0673
PO BOX 13674, EDWARDSVILLE, KS 66113-0674
PO BOX 13675, EDWARDSVILLE, KS 66113-0675
PO BOX 13676, EDWARDSVILLE, KS 66113-0676
PO BOX 13677, EDWARDSVILLE, KS 66113-0677
PO BOX 13678, EDWARDSVILLE, KS 66113-0678
PO BOX 13679, EDWARDSVILLE, KS 66113-0679
PO BOX 13680, EDWARDSVILLE, KS 66113-0680
PO BOX 13681, EDWARDSVILLE, KS 66113-0681
PO BOX 13682, EDWARDSVILLE, KS 66113-0682
PO BOX 13683, EDWARDSVILLE, KS 66113-0683
PO BOX 13684, EDWARDSVILLE, KS 66113-0684
PO BOX 13685, EDWARDSVILLE, KS 66113-0685
PO BOX 13686, EDWARDSVILLE, KS 66113-0686
PO BOX 13687, EDWARDSVILLE, KS 66113-0687
PO BOX 13688, EDWARDSVILLE, KS 66113-0688
PO BOX 13689, EDWARDSVILLE, KS 66113-0689
PO BOX 13690, EDWARDSVILLE, KS 66113-0690
PO BOX 13691, EDWARDSVILLE, KS 66113-0691
PO BOX 13692, EDWARDSVILLE, KS 66113-0692
PO BOX 13693, EDWARDSVILLE, KS 66113-0693
PO BOX 13694, EDWARDSVILLE, KS 66113-0694
PO BOX 13695, EDWARDSVILLE, KS 66113-0695
PO BOX 13696, EDWARDSVILLE, KS 66113-0696
PO BOX 13697, EDWARDSVILLE, KS 66113-0697
PO BOX 13698, EDWARDSVILLE, KS 66113-0698
PO BOX 13699, EDWARDSVILLE, KS 66113-0699
PO BOX 13700, EDWARDSVILLE, KS 66113-0700
PO BOX 13701, EDWARDSVILLE, KS 66113-0701
PO BOX 13702, EDWARDSVILLE, KS 66113-0702
PO BOX 13703, EDWARDSVILLE, KS 66113-0703
PO BOX 13704, EDWARDSVILLE, KS 66113-0704
PO BOX 13705, EDWARDSVILLE, KS 66113-0705
PO BOX 13706, EDWARDSVILLE, KS 66113-0706
PO BOX 13707, EDWARDSVILLE, KS 66113-0707
PO BOX 13708, EDWARDSVILLE, KS 66113-0708
PO BOX 13709, EDWARDSVILLE, KS 66113-0709
PO BOX 13710, EDWARDSVILLE, KS 66113-0710
PO BOX 13711, EDWARDSVILLE, KS 66113-0711
PO BOX 13712, EDWARDSVILLE, KS 66113-0712
PO BOX 13713, EDWARDSVILLE, KS 66113-0713
PO BOX 13714, EDWARDSVILLE, KS 66113-0714
PO BOX 13715, EDWARDSVILLE, KS 66113-0715
PO BOX 13716, EDWARDSVILLE, KS 66113-0716
PO BOX 13717, EDWARDSVILLE, KS 66113-0717
PO BOX 13718, EDWARDSVILLE, KS 66113-0718
PO BOX 13719, EDWARDSVILLE, KS 66113-0719
PO BOX 13720, EDWARDSVILLE, KS 66113-0720
PO BOX 13721, EDWARDSVILLE, KS 66113-0721
PO BOX 13722, EDWARDSVILLE, KS 66113-0722
PO BOX 13723, EDWARDSVILLE, KS 66113-0723
PO BOX 13724, EDWARDSVILLE, KS 66113-0724
PO BOX 13725, EDWARDSVILLE, KS 66113-0725
PO BOX 13726, EDWARDSVILLE, KS 66113-0726
PO BOX 13727, EDWARDSVILLE, KS 66113-0727
PO BOX 13728, EDWARDSVILLE, KS 66113-0728
PO BOX 13729, EDWARDSVILLE, KS 66113-0729
PO BOX 13730, EDWARDSVILLE, KS 66113-0730
PO BOX 13731, EDWARDSVILLE, KS 66113-0731
PO BOX 13732, EDWARDSVILLE, KS 66113-0732
PO BOX 13733, EDWARDSVILLE, KS 66113-0733
PO BOX 13734, EDWARDSVILLE, KS 66113-0734
PO BOX 13735, EDWARDSVILLE, KS 66113-0735
PO BOX 13736, EDWARDSVILLE, KS 66113-0736
PO BOX 13737, EDWARDSVILLE, KS 66113-0737
PO BOX 13738, EDWARDSVILLE, KS 66113-0738
PO BOX 13739, EDWARDSVILLE, KS 66113-0739
PO BOX 13740, EDWARDSVILLE, KS 66113-0740
PO BOX 13741, EDWARDSVILLE, KS 66113-0741
PO BOX 13742, EDWARDSVILLE, KS 66113-0742
PO BOX 13743, EDWARDSVILLE, KS 66113-0743
PO BOX 13744, EDWARDSVILLE, KS 66113-0744
PO BOX 13745, EDWARDSVILLE, KS 66113-0745
PO BOX 13746, EDWARDSVILLE, KS 66113-0746
PO BOX 13747, EDWARDSVILLE, KS 66113-0747
PO BOX 13748, EDWARDSVILLE, KS 66113-0748
PO BOX 13749, EDWARDSVILLE, KS 66113-0749
PO BOX 13750, EDWARDSVILLE, KS 66113-0750
PO BOX 13751, EDWARDSVILLE, KS 66113-0751
PO BOX 13752, EDWARDSVILLE, KS 66113-0752
PO BOX 13753, EDWARDSVILLE, KS 66113-0753
PO BOX 13754, EDWARDSVILLE, KS 66113-0754
PO BOX 13755, EDWARDSVILLE, KS 66113-0755
PO BOX 13756, EDWARDSVILLE, KS 66113-0756
PO BOX 13757, EDWARDSVILLE, KS 66113-0757
PO BOX 13758, EDWARDSVILLE, KS 66113-0758
PO BOX 13759, EDWARDSVILLE, KS 66113-0759
PO BOX 13760, EDWARDSVILLE, KS 66113-0760
PO BOX 13761, EDWARDSVILLE, KS 66113-0761
PO BOX 13762, EDWARDSVILLE, KS 66113-0762
PO BOX 13763, EDWARDSVILLE, KS 66113-0763
PO BOX 13764, EDWARDSVILLE, KS 66113-0764
PO BOX 13765, EDWARDSVILLE, KS 66113-0765
PO BOX 13766, EDWARDSVILLE, KS 66113-0766
PO BOX 13767, EDWARDSVILLE, KS 66113-0767
PO BOX 13768, EDWARDSVILLE, KS 66113-0768
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