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 10541, BLACKSBURG, VA 24062-0541
PO BOX 10542, BLACKSBURG, VA 24062-0542
PO BOX 10543, BLACKSBURG, VA 24062-0543
PO BOX 10544, BLACKSBURG, VA 24062-0544
PO BOX 10545, BLACKSBURG, VA 24062-0545
PO BOX 10546, BLACKSBURG, VA 24062-0546
PO BOX 10547, BLACKSBURG, VA 24062-0547
PO BOX 10548, BLACKSBURG, VA 24062-0548
PO BOX 10549, BLACKSBURG, VA 24062-0549
PO BOX 10550, BLACKSBURG, VA 24062-0550
PO BOX 10551, BLACKSBURG, VA 24062-0551
PO BOX 10552, BLACKSBURG, VA 24062-0552
PO BOX 10553, BLACKSBURG, VA 24062-0553
PO BOX 10554, BLACKSBURG, VA 24062-0554
PO BOX 10555, BLACKSBURG, VA 24062-0555
PO BOX 10556, BLACKSBURG, VA 24062-0556
PO BOX 10557, BLACKSBURG, VA 24062-0557
PO BOX 10558, BLACKSBURG, VA 24062-0558
PO BOX 10559, BLACKSBURG, VA 24062-0559
PO BOX 10560, BLACKSBURG, VA 24062-0560
PO BOX 10561, BLACKSBURG, VA 24062-0561
PO BOX 10562, BLACKSBURG, VA 24062-0562
PO BOX 10563, BLACKSBURG, VA 24062-0563
PO BOX 10564, BLACKSBURG, VA 24062-0564
PO BOX 10565, BLACKSBURG, VA 24062-0565
PO BOX 10566, BLACKSBURG, VA 24062-0566
PO BOX 10567, BLACKSBURG, VA 24062-0567
PO BOX 10568, BLACKSBURG, VA 24062-0568
PO BOX 10569, BLACKSBURG, VA 24062-0569
PO BOX 10570, BLACKSBURG, VA 24062-0570
PO BOX 10571, BLACKSBURG, VA 24062-0571
PO BOX 10572, BLACKSBURG, VA 24062-0572
PO BOX 10573, BLACKSBURG, VA 24062-0573
PO BOX 10574, BLACKSBURG, VA 24062-0574
PO BOX 10575, BLACKSBURG, VA 24062-0575
PO BOX 10576, BLACKSBURG, VA 24062-0576
PO BOX 10577, BLACKSBURG, VA 24062-0577
PO BOX 10578, BLACKSBURG, VA 24062-0578
PO BOX 10579, BLACKSBURG, VA 24062-0579
PO BOX 10580, BLACKSBURG, VA 24062-0580
PO BOX 10581, BLACKSBURG, VA 24062-0581
PO BOX 10582, BLACKSBURG, VA 24062-0582
PO BOX 10583, BLACKSBURG, VA 24062-0583
PO BOX 10584, BLACKSBURG, VA 24062-0584
PO BOX 10585, BLACKSBURG, VA 24062-0585
PO BOX 10586, BLACKSBURG, VA 24062-0586
PO BOX 10587, BLACKSBURG, VA 24062-0587
PO BOX 10588, BLACKSBURG, VA 24062-0588
PO BOX 10589, BLACKSBURG, VA 24062-0589
PO BOX 10590, BLACKSBURG, VA 24062-0590
PO BOX 10591, BLACKSBURG, VA 24062-0591
PO BOX 10592, BLACKSBURG, VA 24062-0592
PO BOX 10593, BLACKSBURG, VA 24062-0593
PO BOX 10594, BLACKSBURG, VA 24062-0594
PO BOX 10595, BLACKSBURG, VA 24062-0595
PO BOX 10596, BLACKSBURG, VA 24062-0596
PO BOX 10597, BLACKSBURG, VA 24062-0597
PO BOX 10598, BLACKSBURG, VA 24062-0598
PO BOX 10599, BLACKSBURG, VA 24062-0599
PO BOX 10600, BLACKSBURG, VA 24062-0600
PO BOX 10601, BLACKSBURG, VA 24062-0601
PO BOX 10602, BLACKSBURG, VA 24062-0602
PO BOX 10603, BLACKSBURG, VA 24062-0603
PO BOX 10604, BLACKSBURG, VA 24062-0604
PO BOX 10605, BLACKSBURG, VA 24062-0605
PO BOX 10606, BLACKSBURG, VA 24062-0606
PO BOX 10607, BLACKSBURG, VA 24062-0607
PO BOX 10608, BLACKSBURG, VA 24062-0608
PO BOX 10609, BLACKSBURG, VA 24062-0609
PO BOX 10610, BLACKSBURG, VA 24062-0610
PO BOX 10611, BLACKSBURG, VA 24062-0611
PO BOX 10612, BLACKSBURG, VA 24062-0612
PO BOX 10613, BLACKSBURG, VA 24062-0613
PO BOX 10614, BLACKSBURG, VA 24062-0614
PO BOX 10615, BLACKSBURG, VA 24062-0615
PO BOX 10616, BLACKSBURG, VA 24062-0616
PO BOX 10617, BLACKSBURG, VA 24062-0617
PO BOX 10618, BLACKSBURG, VA 24062-0618
PO BOX 10619, BLACKSBURG, VA 24062-0619
PO BOX 10620, BLACKSBURG, VA 24062-0620
PO BOX 10621, BLACKSBURG, VA 24062-0621
PO BOX 10622, BLACKSBURG, VA 24062-0622
PO BOX 10623, BLACKSBURG, VA 24062-0623
PO BOX 10624, BLACKSBURG, VA 24062-0624
PO BOX 10625, BLACKSBURG, VA 24062-0625
PO BOX 10626, BLACKSBURG, VA 24062-0626
PO BOX 10627, BLACKSBURG, VA 24062-0627
PO BOX 10628, BLACKSBURG, VA 24062-0628
PO BOX 10629, BLACKSBURG, VA 24062-0629
PO BOX 10630, BLACKSBURG, VA 24062-0630
PO BOX 10631, BLACKSBURG, VA 24062-0631
PO BOX 10632, BLACKSBURG, VA 24062-0632
PO BOX 10633, BLACKSBURG, VA 24062-0633
PO BOX 10634, BLACKSBURG, VA 24062-0634
PO BOX 10635, BLACKSBURG, VA 24062-0635
PO BOX 10636, BLACKSBURG, VA 24062-0636
PO BOX 10637, BLACKSBURG, VA 24062-0637
PO BOX 10638, BLACKSBURG, VA 24062-0638
PO BOX 10639, BLACKSBURG, VA 24062-0639
PO BOX 10640, BLACKSBURG, VA 24062-0640
PO BOX 10641, BLACKSBURG, VA 24062-0641
PO BOX 10642, BLACKSBURG, VA 24062-0642
PO BOX 10643, BLACKSBURG, VA 24062-0643
PO BOX 10644, BLACKSBURG, VA 24062-0644
PO BOX 10645, BLACKSBURG, VA 24062-0645
PO BOX 10646, BLACKSBURG, VA 24062-0646
PO BOX 10647, BLACKSBURG, VA 24062-0647
PO BOX 10648, BLACKSBURG, VA 24062-0648
PO BOX 10649, BLACKSBURG, VA 24062-0649
PO BOX 10650, BLACKSBURG, VA 24062-0650
PO BOX 10651, BLACKSBURG, VA 24062-0651
PO BOX 10652, BLACKSBURG, VA 24062-0652
PO BOX 10653, BLACKSBURG, VA 24062-0653
PO BOX 10654, BLACKSBURG, VA 24062-0654
PO BOX 10655, BLACKSBURG, VA 24062-0655
PO BOX 10656, BLACKSBURG, VA 24062-0656
PO BOX 10657, BLACKSBURG, VA 24062-0657
PO BOX 10658, BLACKSBURG, VA 24062-0658
PO BOX 10659, BLACKSBURG, VA 24062-0659
PO BOX 10660, BLACKSBURG, VA 24062-0660
PO BOX 10661, BLACKSBURG, VA 24062-0661
PO BOX 10662, BLACKSBURG, VA 24062-0662
PO BOX 10663, BLACKSBURG, VA 24062-0663
PO BOX 10664, BLACKSBURG, VA 24062-0664
PO BOX 10665, BLACKSBURG, VA 24062-0665
PO BOX 10666, BLACKSBURG, VA 24062-0666
PO BOX 10667, BLACKSBURG, VA 24062-0667
PO BOX 10668, BLACKSBURG, VA 24062-0668
PO BOX 10669, BLACKSBURG, VA 24062-0669
PO BOX 10670, BLACKSBURG, VA 24062-0670
PO BOX 10671, BLACKSBURG, VA 24062-0671
PO BOX 10672, BLACKSBURG, VA 24062-0672
PO BOX 10673, BLACKSBURG, VA 24062-0673
PO BOX 10674, BLACKSBURG, VA 24062-0674
PO BOX 10675, BLACKSBURG, VA 24062-0675
PO BOX 10676, BLACKSBURG, VA 24062-0676
PO BOX 10677, BLACKSBURG, VA 24062-0677
PO BOX 10678, BLACKSBURG, VA 24062-0678
PO BOX 10679, BLACKSBURG, VA 24062-0679
PO BOX 10680, BLACKSBURG, VA 24062-0680
PO BOX 10681, BLACKSBURG, VA 24062-0681
PO BOX 10682, BLACKSBURG, VA 24062-0682
PO BOX 10683, BLACKSBURG, VA 24062-0683
PO BOX 10684, BLACKSBURG, VA 24062-0684
PO BOX 10685, BLACKSBURG, VA 24062-0685
PO BOX 10686, BLACKSBURG, VA 24062-0686
PO BOX 10687, BLACKSBURG, VA 24062-0687
PO BOX 10688, BLACKSBURG, VA 24062-0688
PO BOX 10689, BLACKSBURG, VA 24062-0689
PO BOX 10690, BLACKSBURG, VA 24062-0690
PO BOX 10691, BLACKSBURG, VA 24062-0691
PO BOX 10692, BLACKSBURG, VA 24062-0692
PO BOX 10693, BLACKSBURG, VA 24062-0693
PO BOX 10694, BLACKSBURG, VA 24062-0694
PO BOX 10695, BLACKSBURG, VA 24062-0695
PO BOX 10696, BLACKSBURG, VA 24062-0696
PO BOX 10697, BLACKSBURG, VA 24062-0697
PO BOX 10698, BLACKSBURG, VA 24062-0698
PO BOX 10699, BLACKSBURG, VA 24062-0699
PO BOX 10700, BLACKSBURG, VA 24062-0700
PO BOX 10701, BLACKSBURG, VA 24062-0701
PO BOX 10702, BLACKSBURG, VA 24062-0702
PO BOX 10703, BLACKSBURG, VA 24062-0703
PO BOX 10704, BLACKSBURG, VA 24062-0704
PO BOX 10705, BLACKSBURG, VA 24062-0705
PO BOX 10706, BLACKSBURG, VA 24062-0706
PO BOX 10707, BLACKSBURG, VA 24062-0707
PO BOX 10708, BLACKSBURG, VA 24062-0708
PO BOX 10709, BLACKSBURG, VA 24062-0709
PO BOX 10710, BLACKSBURG, VA 24062-0710
PO BOX 10711, BLACKSBURG, VA 24062-0711
PO BOX 10712, BLACKSBURG, VA 24062-0712
PO BOX 10713, BLACKSBURG, VA 24062-0713
PO BOX 10714, BLACKSBURG, VA 24062-0714
PO BOX 10715, BLACKSBURG, VA 24062-0715
PO BOX 10716, BLACKSBURG, VA 24062-0716
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