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 10501, SPRINGFIELD, MO 65808-0501
PO BOX 10502, SPRINGFIELD, MO 65808-0502
PO BOX 10503, SPRINGFIELD, MO 65808-0503
PO BOX 10504, SPRINGFIELD, MO 65808-0504
PO BOX 10505, SPRINGFIELD, MO 65808-0505
PO BOX 10506, SPRINGFIELD, MO 65808-0506
PO BOX 10507, SPRINGFIELD, MO 65808-0507
PO BOX 10508, SPRINGFIELD, MO 65808-0508
PO BOX 10509, SPRINGFIELD, MO 65808-0509
PO BOX 10510, SPRINGFIELD, MO 65808-0510
PO BOX 10511, SPRINGFIELD, MO 65808-0511
PO BOX 10512, SPRINGFIELD, MO 65808-0512
PO BOX 10513, SPRINGFIELD, MO 65808-0513
PO BOX 10514, SPRINGFIELD, MO 65808-0514
PO BOX 10515, SPRINGFIELD, MO 65808-0515
PO BOX 10516, SPRINGFIELD, MO 65808-0516
PO BOX 10517, SPRINGFIELD, MO 65808-0517
PO BOX 10518, SPRINGFIELD, MO 65808-0518
PO BOX 10519, SPRINGFIELD, MO 65808-0519
PO BOX 10520, SPRINGFIELD, MO 65808-0520
PO BOX 10521, SPRINGFIELD, MO 65808-0521
PO BOX 10522, SPRINGFIELD, MO 65808-0522
PO BOX 10523, SPRINGFIELD, MO 65808-0523
PO BOX 10524, SPRINGFIELD, MO 65808-0524
PO BOX 10525, SPRINGFIELD, MO 65808-0525
PO BOX 10526, SPRINGFIELD, MO 65808-0526
PO BOX 10527, SPRINGFIELD, MO 65808-0527
PO BOX 10528, SPRINGFIELD, MO 65808-0528
PO BOX 10529, SPRINGFIELD, MO 65808-0529
PO BOX 10530, SPRINGFIELD, MO 65808-0530
PO BOX 10531, SPRINGFIELD, MO 65808-0531
PO BOX 10532, SPRINGFIELD, MO 65808-0532
PO BOX 10533, SPRINGFIELD, MO 65808-0533
PO BOX 10534, SPRINGFIELD, MO 65808-0534
PO BOX 10535, SPRINGFIELD, MO 65808-0535
PO BOX 10536, SPRINGFIELD, MO 65808-0536
PO BOX 10537, SPRINGFIELD, MO 65808-0537
PO BOX 10538, SPRINGFIELD, MO 65808-0538
PO BOX 10539, SPRINGFIELD, MO 65808-0539
PO BOX 10540, SPRINGFIELD, MO 65808-0540
PO BOX 10541, SPRINGFIELD, MO 65808-0541
PO BOX 10542, SPRINGFIELD, MO 65808-0542
PO BOX 10543, SPRINGFIELD, MO 65808-0543
PO BOX 10544, SPRINGFIELD, MO 65808-0544
PO BOX 10545, SPRINGFIELD, MO 65808-0545
PO BOX 10546, SPRINGFIELD, MO 65808-0546
PO BOX 10547, SPRINGFIELD, MO 65808-0547
PO BOX 10548, SPRINGFIELD, MO 65808-0548
PO BOX 10549, SPRINGFIELD, MO 65808-0549
PO BOX 10550, SPRINGFIELD, MO 65808-0550
PO BOX 10551, SPRINGFIELD, MO 65808-0551
PO BOX 10552, SPRINGFIELD, MO 65808-0552
PO BOX 10553, SPRINGFIELD, MO 65808-0553
PO BOX 10554, SPRINGFIELD, MO 65808-0554
PO BOX 10555, SPRINGFIELD, MO 65808-0555
PO BOX 10556, SPRINGFIELD, MO 65808-0556
PO BOX 10557, SPRINGFIELD, MO 65808-0557
PO BOX 10558, SPRINGFIELD, MO 65808-0558
PO BOX 10559, SPRINGFIELD, MO 65808-0559
PO BOX 10560, SPRINGFIELD, MO 65808-0560
PO BOX 10561, SPRINGFIELD, MO 65808-0561
PO BOX 10562, SPRINGFIELD, MO 65808-0562
PO BOX 10563, SPRINGFIELD, MO 65808-0563
PO BOX 10564, SPRINGFIELD, MO 65808-0564
PO BOX 10565, SPRINGFIELD, MO 65808-0565
PO BOX 10566, SPRINGFIELD, MO 65808-0566
PO BOX 10567, SPRINGFIELD, MO 65808-0567
PO BOX 10568, SPRINGFIELD, MO 65808-0568
PO BOX 10569, SPRINGFIELD, MO 65808-0569
PO BOX 10570, SPRINGFIELD, MO 65808-0570
PO BOX 10571, SPRINGFIELD, MO 65808-0571
PO BOX 10572, SPRINGFIELD, MO 65808-0572
PO BOX 10573, SPRINGFIELD, MO 65808-0573
PO BOX 10574, SPRINGFIELD, MO 65808-0574
PO BOX 10575, SPRINGFIELD, MO 65808-0575
PO BOX 10576, SPRINGFIELD, MO 65808-0576
PO BOX 10577, SPRINGFIELD, MO 65808-0577
PO BOX 10578, SPRINGFIELD, MO 65808-0578
PO BOX 10579, SPRINGFIELD, MO 65808-0579
PO BOX 10580, SPRINGFIELD, MO 65808-0580
PO BOX 10581, SPRINGFIELD, MO 65808-0581
PO BOX 10582, SPRINGFIELD, MO 65808-0582
PO BOX 10583, SPRINGFIELD, MO 65808-0583
PO BOX 10584, SPRINGFIELD, MO 65808-0584
PO BOX 10585, SPRINGFIELD, MO 65808-0585
PO BOX 10586, SPRINGFIELD, MO 65808-0586
PO BOX 10587, SPRINGFIELD, MO 65808-0587
PO BOX 10588, SPRINGFIELD, MO 65808-0588
PO BOX 10589, SPRINGFIELD, MO 65808-0589
PO BOX 10590, SPRINGFIELD, MO 65808-0590
PO BOX 10591, SPRINGFIELD, MO 65808-0591
PO BOX 10592, SPRINGFIELD, MO 65808-0592
PO BOX 10593, SPRINGFIELD, MO 65808-0593
PO BOX 10594, SPRINGFIELD, MO 65808-0594
PO BOX 10595, SPRINGFIELD, MO 65808-0595
PO BOX 10596, SPRINGFIELD, MO 65808-0596
PO BOX 10597, SPRINGFIELD, MO 65808-0597
PO BOX 10598, SPRINGFIELD, MO 65808-0598
PO BOX 10599, SPRINGFIELD, MO 65808-0599
PO BOX 10600, SPRINGFIELD, MO 65808-0600
PO BOX 10601, SPRINGFIELD, MO 65808-0601
PO BOX 10602, SPRINGFIELD, MO 65808-0602
PO BOX 10603, SPRINGFIELD, MO 65808-0603
PO BOX 10604, SPRINGFIELD, MO 65808-0604
PO BOX 10605, SPRINGFIELD, MO 65808-0605
PO BOX 10606, SPRINGFIELD, MO 65808-0606
PO BOX 10607, SPRINGFIELD, MO 65808-0607
PO BOX 10608, SPRINGFIELD, MO 65808-0608
PO BOX 10609, SPRINGFIELD, MO 65808-0609
PO BOX 10610, SPRINGFIELD, MO 65808-0610
PO BOX 10611, SPRINGFIELD, MO 65808-0611
PO BOX 10612, SPRINGFIELD, MO 65808-0612
PO BOX 10613, SPRINGFIELD, MO 65808-0613
PO BOX 10614, SPRINGFIELD, MO 65808-0614
PO BOX 10615, SPRINGFIELD, MO 65808-0615
PO BOX 10616, SPRINGFIELD, MO 65808-0616
PO BOX 10617, SPRINGFIELD, MO 65808-0617
PO BOX 10618, SPRINGFIELD, MO 65808-0618
PO BOX 10619, SPRINGFIELD, MO 65808-0619
PO BOX 10620, SPRINGFIELD, MO 65808-0620
PO BOX 10621, SPRINGFIELD, MO 65808-0621
PO BOX 10622, SPRINGFIELD, MO 65808-0622
PO BOX 10623, SPRINGFIELD, MO 65808-0623
PO BOX 10624, SPRINGFIELD, MO 65808-0624
PO BOX 10625, SPRINGFIELD, MO 65808-0625
PO BOX 10626, SPRINGFIELD, MO 65808-0626
PO BOX 10627, SPRINGFIELD, MO 65808-0627
PO BOX 10628, SPRINGFIELD, MO 65808-0628
PO BOX 10629, SPRINGFIELD, MO 65808-0629
PO BOX 10630, SPRINGFIELD, MO 65808-0630
PO BOX 10631, SPRINGFIELD, MO 65808-0631
PO BOX 10632, SPRINGFIELD, MO 65808-0632
PO BOX 10633, SPRINGFIELD, MO 65808-0633
PO BOX 10634, SPRINGFIELD, MO 65808-0634
PO BOX 10635, SPRINGFIELD, MO 65808-0635
PO BOX 10636, SPRINGFIELD, MO 65808-0636
PO BOX 10637, SPRINGFIELD, MO 65808-0637
PO BOX 10638, SPRINGFIELD, MO 65808-0638
PO BOX 10639, SPRINGFIELD, MO 65808-0639
PO BOX 10640, SPRINGFIELD, MO 65808-0640
PO BOX 10641, SPRINGFIELD, MO 65808-0641
PO BOX 10642, SPRINGFIELD, MO 65808-0642
PO BOX 10643, SPRINGFIELD, MO 65808-0643
PO BOX 10644, SPRINGFIELD, MO 65808-0644
PO BOX 10645, SPRINGFIELD, MO 65808-0645
PO BOX 10646, SPRINGFIELD, MO 65808-0646
PO BOX 10647, SPRINGFIELD, MO 65808-0647
PO BOX 10648, SPRINGFIELD, MO 65808-0648
PO BOX 10649, SPRINGFIELD, MO 65808-0649
PO BOX 10650, SPRINGFIELD, MO 65808-0650
PO BOX 10651, SPRINGFIELD, MO 65808-0651
PO BOX 10652, SPRINGFIELD, MO 65808-0652
PO BOX 10653, SPRINGFIELD, MO 65808-0653
PO BOX 10654, SPRINGFIELD, MO 65808-0654
PO BOX 10655, SPRINGFIELD, MO 65808-0655
PO BOX 10656, SPRINGFIELD, MO 65808-0656
PO BOX 10657, SPRINGFIELD, MO 65808-0657
PO BOX 10658, SPRINGFIELD, MO 65808-0658
PO BOX 10659, SPRINGFIELD, MO 65808-0659
PO BOX 10660, SPRINGFIELD, MO 65808-0660
PO BOX 10661, SPRINGFIELD, MO 65808-0661
PO BOX 10662, SPRINGFIELD, MO 65808-0662
PO BOX 10663, SPRINGFIELD, MO 65808-0663
PO BOX 10664, SPRINGFIELD, MO 65808-0664
PO BOX 10665, SPRINGFIELD, MO 65808-0665
PO BOX 10666, SPRINGFIELD, MO 65808-0666
PO BOX 10667, SPRINGFIELD, MO 65808-0667
PO BOX 10668, SPRINGFIELD, MO 65808-0668
PO BOX 10669, SPRINGFIELD, MO 65808-0669
PO BOX 10670, SPRINGFIELD, MO 65808-0670
PO BOX 10671, SPRINGFIELD, MO 65808-0671
PO BOX 10672, SPRINGFIELD, MO 65808-0672
PO BOX 10673, SPRINGFIELD, MO 65808-0673
PO BOX 10674, SPRINGFIELD, MO 65808-0674
PO BOX 10675, SPRINGFIELD, MO 65808-0675
PO BOX 10676, SPRINGFIELD, MO 65808-0676
PO BOX 10677, SPRINGFIELD, MO 65808-0677
PO BOX 10678, SPRINGFIELD, MO 65808-0678
PO BOX 10679, SPRINGFIELD, MO 65808-0679
PO BOX 10680, SPRINGFIELD, MO 65808-0680
PO BOX 10681, SPRINGFIELD, MO 65808-0681
PO BOX 10682, SPRINGFIELD, MO 65808-0682
PO BOX 10683, SPRINGFIELD, MO 65808-0683
PO BOX 10684, SPRINGFIELD, MO 65808-0684
PO BOX 10685, SPRINGFIELD, MO 65808-0685
PO BOX 10686, SPRINGFIELD, MO 65808-0686
PO BOX 10687, SPRINGFIELD, MO 65808-0687
PO BOX 10688, SPRINGFIELD, MO 65808-0688
PO BOX 10689, SPRINGFIELD, MO 65808-0689
PO BOX 10690, SPRINGFIELD, MO 65808-0690
PO BOX 10691, SPRINGFIELD, MO 65808-0691
PO BOX 10692, SPRINGFIELD, MO 65808-0692
PO BOX 10693, SPRINGFIELD, MO 65808-0693
PO BOX 10694, SPRINGFIELD, MO 65808-0694
PO BOX 10695, SPRINGFIELD, MO 65808-0695
PO BOX 10696, SPRINGFIELD, MO 65808-0696
PO BOX 10697, SPRINGFIELD, MO 65808-0697
PO BOX 10698, SPRINGFIELD, MO 65808-0698
PO BOX 10699, SPRINGFIELD, MO 65808-0699
PO BOX 10700, SPRINGFIELD, MO 65808-0700
PO BOX 10701, SPRINGFIELD, MO 65808-0701
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