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 9541, CANOGA PARK, CA 91309-0541
PO BOX 9542, CANOGA PARK, CA 91309-0542
PO BOX 9543, CANOGA PARK, CA 91309-0543
PO BOX 9544, CANOGA PARK, CA 91309-0544
PO BOX 9545, CANOGA PARK, CA 91309-0545
PO BOX 9546, CANOGA PARK, CA 91309-0546
PO BOX 9547, CANOGA PARK, CA 91309-0547
PO BOX 9548, CANOGA PARK, CA 91309-0548
PO BOX 9549, CANOGA PARK, CA 91309-0549
PO BOX 9550, CANOGA PARK, CA 91309-0550
PO BOX 9551, CANOGA PARK, CA 91309-0551
PO BOX 9552, CANOGA PARK, CA 91309-0552
PO BOX 9553, CANOGA PARK, CA 91309-0553
PO BOX 9554, CANOGA PARK, CA 91309-0554
PO BOX 9555, CANOGA PARK, CA 91309-0555
PO BOX 9556, CANOGA PARK, CA 91309-0556
PO BOX 9557, CANOGA PARK, CA 91309-0557
PO BOX 9558, CANOGA PARK, CA 91309-0558
PO BOX 9559, CANOGA PARK, CA 91309-0559
PO BOX 9560, CANOGA PARK, CA 91309-0560
PO BOX 9561, CANOGA PARK, CA 91309-0561
PO BOX 9562, CANOGA PARK, CA 91309-0562
PO BOX 9563, CANOGA PARK, CA 91309-0563
PO BOX 9564, CANOGA PARK, CA 91309-0564
PO BOX 9565, CANOGA PARK, CA 91309-0565
PO BOX 9566, CANOGA PARK, CA 91309-0566
PO BOX 9567, CANOGA PARK, CA 91309-0567
PO BOX 9568, CANOGA PARK, CA 91309-0568
PO BOX 9569, CANOGA PARK, CA 91309-0569
PO BOX 9570, CANOGA PARK, CA 91309-0570
PO BOX 9571, CANOGA PARK, CA 91309-0571
PO BOX 9572, CANOGA PARK, CA 91309-0572
PO BOX 9573, CANOGA PARK, CA 91309-0573
PO BOX 9574, CANOGA PARK, CA 91309-0574
PO BOX 9575, CANOGA PARK, CA 91309-0575
PO BOX 9576, CANOGA PARK, CA 91309-0576
PO BOX 9577, CANOGA PARK, CA 91309-0577
PO BOX 9578, CANOGA PARK, CA 91309-0578
PO BOX 9579, CANOGA PARK, CA 91309-0579
PO BOX 9580, CANOGA PARK, CA 91309-0580
PO BOX 9581, CANOGA PARK, CA 91309-0581
PO BOX 9582, CANOGA PARK, CA 91309-0582
PO BOX 9583, CANOGA PARK, CA 91309-0583
PO BOX 9584, CANOGA PARK, CA 91309-0584
PO BOX 9585, CANOGA PARK, CA 91309-0585
PO BOX 9586, CANOGA PARK, CA 91309-0586
PO BOX 9587, CANOGA PARK, CA 91309-0587
PO BOX 9588, CANOGA PARK, CA 91309-0588
PO BOX 9589, CANOGA PARK, CA 91309-0589
PO BOX 9590, CANOGA PARK, CA 91309-0590
PO BOX 9591, CANOGA PARK, CA 91309-0591
PO BOX 9592, CANOGA PARK, CA 91309-0592
PO BOX 9593, CANOGA PARK, CA 91309-0593
PO BOX 9594, CANOGA PARK, CA 91309-0594
PO BOX 9595, CANOGA PARK, CA 91309-0595
PO BOX 9596, CANOGA PARK, CA 91309-0596
PO BOX 9597, CANOGA PARK, CA 91309-0597
PO BOX 9598, CANOGA PARK, CA 91309-0598
PO BOX 9599, CANOGA PARK, CA 91309-0599
PO BOX 9600, CANOGA PARK, CA 91309-0600
PO BOX 9601, CANOGA PARK, CA 91309-0601
PO BOX 9602, CANOGA PARK, CA 91309-0602
PO BOX 9603, CANOGA PARK, CA 91309-0603
PO BOX 9604, CANOGA PARK, CA 91309-0604
PO BOX 9605, CANOGA PARK, CA 91309-0605
PO BOX 9606, CANOGA PARK, CA 91309-0606
PO BOX 9607, CANOGA PARK, CA 91309-0607
PO BOX 9608, CANOGA PARK, CA 91309-0608
PO BOX 9609, CANOGA PARK, CA 91309-0609
PO BOX 9610, CANOGA PARK, CA 91309-0610
PO BOX 9611, CANOGA PARK, CA 91309-0611
PO BOX 9612, CANOGA PARK, CA 91309-0612
PO BOX 9613, CANOGA PARK, CA 91309-0613
PO BOX 9614, CANOGA PARK, CA 91309-0614
PO BOX 9615, CANOGA PARK, CA 91309-0615
PO BOX 9616, CANOGA PARK, CA 91309-0616
PO BOX 9617, CANOGA PARK, CA 91309-0617
PO BOX 9618, CANOGA PARK, CA 91309-0618
PO BOX 9619, CANOGA PARK, CA 91309-0619
PO BOX 9620, CANOGA PARK, CA 91309-0620
PO BOX 9621, CANOGA PARK, CA 91309-0621
PO BOX 9622, CANOGA PARK, CA 91309-0622
PO BOX 9623, CANOGA PARK, CA 91309-0623
PO BOX 9624, CANOGA PARK, CA 91309-0624
PO BOX 9625, CANOGA PARK, CA 91309-0625
PO BOX 9626, CANOGA PARK, CA 91309-0626
PO BOX 9627, CANOGA PARK, CA 91309-0627
PO BOX 9628, CANOGA PARK, CA 91309-0628
PO BOX 9629, CANOGA PARK, CA 91309-0629
PO BOX 9630, CANOGA PARK, CA 91309-0630
PO BOX 9631, CANOGA PARK, CA 91309-0631
PO BOX 9632, CANOGA PARK, CA 91309-0632
PO BOX 9633, CANOGA PARK, CA 91309-0633
PO BOX 9634, CANOGA PARK, CA 91309-0634
PO BOX 9635, CANOGA PARK, CA 91309-0635
PO BOX 9636, CANOGA PARK, CA 91309-0636
PO BOX 9637, CANOGA PARK, CA 91309-0637
PO BOX 9638, CANOGA PARK, CA 91309-0638
PO BOX 9639, CANOGA PARK, CA 91309-0639
PO BOX 9640, CANOGA PARK, CA 91309-0640
PO BOX 9641, CANOGA PARK, CA 91309-0641
PO BOX 9642, CANOGA PARK, CA 91309-0642
PO BOX 9643, CANOGA PARK, CA 91309-0643
PO BOX 9644, CANOGA PARK, CA 91309-0644
PO BOX 9645, CANOGA PARK, CA 91309-0645
PO BOX 9646, CANOGA PARK, CA 91309-0646
PO BOX 9647, CANOGA PARK, CA 91309-0647
PO BOX 9648, CANOGA PARK, CA 91309-0648
PO BOX 9649, CANOGA PARK, CA 91309-0649
PO BOX 9650, CANOGA PARK, CA 91309-0650
PO BOX 9651, CANOGA PARK, CA 91309-0651
PO BOX 9652, CANOGA PARK, CA 91309-0652
PO BOX 9653, CANOGA PARK, CA 91309-0653
PO BOX 9654, CANOGA PARK, CA 91309-0654
PO BOX 9655, CANOGA PARK, CA 91309-0655
PO BOX 9656, CANOGA PARK, CA 91309-0656
PO BOX 9657, CANOGA PARK, CA 91309-0657
PO BOX 9658, CANOGA PARK, CA 91309-0658
PO BOX 9659, CANOGA PARK, CA 91309-0659
PO BOX 9660, CANOGA PARK, CA 91309-0660
PO BOX 9661, CANOGA PARK, CA 91309-0661
PO BOX 9662, CANOGA PARK, CA 91309-0662
PO BOX 9663, CANOGA PARK, CA 91309-0663
PO BOX 9664, CANOGA PARK, CA 91309-0664
PO BOX 9665, CANOGA PARK, CA 91309-0665
PO BOX 9666, CANOGA PARK, CA 91309-0666
PO BOX 9667, CANOGA PARK, CA 91309-0667
PO BOX 9668, CANOGA PARK, CA 91309-0668
PO BOX 9669, CANOGA PARK, CA 91309-0669
PO BOX 9670, CANOGA PARK, CA 91309-0670
PO BOX 9671, CANOGA PARK, CA 91309-0671
PO BOX 9672, CANOGA PARK, CA 91309-0672
PO BOX 9673, CANOGA PARK, CA 91309-0673
PO BOX 9674, CANOGA PARK, CA 91309-0674
PO BOX 9675, CANOGA PARK, CA 91309-0675
PO BOX 9676, CANOGA PARK, CA 91309-0676
PO BOX 9677, CANOGA PARK, CA 91309-0677
PO BOX 9678, CANOGA PARK, CA 91309-0678
PO BOX 9679, CANOGA PARK, CA 91309-0679
PO BOX 9680, CANOGA PARK, CA 91309-0680
PO BOX 9681, CANOGA PARK, CA 91309-0681
PO BOX 9682, CANOGA PARK, CA 91309-0682
PO BOX 9683, CANOGA PARK, CA 91309-0683
PO BOX 9684, CANOGA PARK, CA 91309-0684
PO BOX 9685, CANOGA PARK, CA 91309-0685
PO BOX 9686, CANOGA PARK, CA 91309-0686
PO BOX 9687, CANOGA PARK, CA 91309-0687
PO BOX 9688, CANOGA PARK, CA 91309-0688
PO BOX 9689, CANOGA PARK, CA 91309-0689
PO BOX 9690, CANOGA PARK, CA 91309-0690
PO BOX 9691, CANOGA PARK, CA 91309-0691
PO BOX 9692, CANOGA PARK, CA 91309-0692
PO BOX 9693, CANOGA PARK, CA 91309-0693
PO BOX 9694, CANOGA PARK, CA 91309-0694
PO BOX 9695, CANOGA PARK, CA 91309-0695
PO BOX 9696, CANOGA PARK, CA 91309-0696
PO BOX 9697, CANOGA PARK, CA 91309-0697
PO BOX 9698, CANOGA PARK, CA 91309-0698
PO BOX 9699, CANOGA PARK, CA 91309-0699
PO BOX 9700, CANOGA PARK, CA 91309-0700
PO BOX 9701, CANOGA PARK, CA 91309-0701
PO BOX 9702, CANOGA PARK, CA 91309-0702
PO BOX 9703, CANOGA PARK, CA 91309-0703
PO BOX 9704, CANOGA PARK, CA 91309-0704
PO BOX 9705, CANOGA PARK, CA 91309-0705
PO BOX 9706, CANOGA PARK, CA 91309-0706
PO BOX 9707, CANOGA PARK, CA 91309-0707
PO BOX 9708, CANOGA PARK, CA 91309-0708
PO BOX 9709, CANOGA PARK, CA 91309-0709
PO BOX 9710, CANOGA PARK, CA 91309-0710
PO BOX 9711, CANOGA PARK, CA 91309-0711
PO BOX 9712, CANOGA PARK, CA 91309-0712
PO BOX 9713, CANOGA PARK, CA 91309-0713
PO BOX 9714, CANOGA PARK, CA 91309-0714
PO BOX 9715, CANOGA PARK, CA 91309-0715
PO BOX 9716, CANOGA PARK, CA 91309-0716
PO BOX 9717, CANOGA PARK, CA 91309-0717
PO BOX 9718, CANOGA PARK, CA 91309-0718
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