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 15571, SANTA BARBARA, CA 93107-5571
PO BOX 15572, SANTA BARBARA, CA 93107-5572
PO BOX 15573, SANTA BARBARA, CA 93107-5573
PO BOX 15574, SANTA BARBARA, CA 93107-5574
PO BOX 15575, SANTA BARBARA, CA 93107-5575
PO BOX 15576, SANTA BARBARA, CA 93107-5576
PO BOX 15577, SANTA BARBARA, CA 93107-5577
PO BOX 15578, SANTA BARBARA, CA 93107-5578
PO BOX 15579, SANTA BARBARA, CA 93107-5579
PO BOX 15580, SANTA BARBARA, CA 93107-5580
PO BOX 15581, SANTA BARBARA, CA 93107-5581
PO BOX 15582, SANTA BARBARA, CA 93107-5582
PO BOX 15583, SANTA BARBARA, CA 93107-5583
PO BOX 15584, SANTA BARBARA, CA 93107-5584
PO BOX 15585, SANTA BARBARA, CA 93107-5585
PO BOX 15586, SANTA BARBARA, CA 93107-5586
PO BOX 15587, SANTA BARBARA, CA 93107-5587
PO BOX 15588, SANTA BARBARA, CA 93107-5588
PO BOX 15589, SANTA BARBARA, CA 93107-5589
PO BOX 15590, SANTA BARBARA, CA 93107-5590
PO BOX 15591, SANTA BARBARA, CA 93107-5591
PO BOX 15592, SANTA BARBARA, CA 93107-5592
PO BOX 15593, SANTA BARBARA, CA 93107-5593
PO BOX 15594, SANTA BARBARA, CA 93107-5594
PO BOX 15595, SANTA BARBARA, CA 93107-5595
PO BOX 15596, SANTA BARBARA, CA 93107-5596
PO BOX 15597, SANTA BARBARA, CA 93107-5597
PO BOX 15598, SANTA BARBARA, CA 93107-5598
PO BOX 15599, SANTA BARBARA, CA 93107-5599
PO BOX 15600, SANTA BARBARA, CA 93107-5600
PO BOX 15601, SANTA BARBARA, CA 93107-5601
PO BOX 15602, SANTA BARBARA, CA 93107-5602
PO BOX 15603, SANTA BARBARA, CA 93107-5603
PO BOX 15604, SANTA BARBARA, CA 93107-5604
PO BOX 15605, SANTA BARBARA, CA 93107-5605
PO BOX 15606, SANTA BARBARA, CA 93107-5606
PO BOX 15607, SANTA BARBARA, CA 93107-5607
PO BOX 15608, SANTA BARBARA, CA 93107-5608
PO BOX 15609, SANTA BARBARA, CA 93107-5609
PO BOX 15610, SANTA BARBARA, CA 93107-5610
PO BOX 15611, SANTA BARBARA, CA 93107-5611
PO BOX 15612, SANTA BARBARA, CA 93107-5612
PO BOX 15613, SANTA BARBARA, CA 93107-5613
PO BOX 15614, SANTA BARBARA, CA 93107-5614
PO BOX 15615, SANTA BARBARA, CA 93107-5615
PO BOX 15616, SANTA BARBARA, CA 93107-5616
PO BOX 15617, SANTA BARBARA, CA 93107-5617
PO BOX 15618, SANTA BARBARA, CA 93107-5618
PO BOX 15619, SANTA BARBARA, CA 93107-5619
PO BOX 15620, SANTA BARBARA, CA 93107-5620
PO BOX 15621, SANTA BARBARA, CA 93107-5621
PO BOX 15622, SANTA BARBARA, CA 93107-5622
PO BOX 15623, SANTA BARBARA, CA 93107-5623
PO BOX 15624, SANTA BARBARA, CA 93107-5624
PO BOX 15625, SANTA BARBARA, CA 93107-5625
PO BOX 15626, SANTA BARBARA, CA 93107-5626
PO BOX 15627, SANTA BARBARA, CA 93107-5627
PO BOX 15628, SANTA BARBARA, CA 93107-5628
PO BOX 15629, SANTA BARBARA, CA 93107-5629
PO BOX 15630, SANTA BARBARA, CA 93107-5630
PO BOX 15631, SANTA BARBARA, CA 93107-5631
PO BOX 15632, SANTA BARBARA, CA 93107-5632
PO BOX 15633, SANTA BARBARA, CA 93107-5633
PO BOX 15634, SANTA BARBARA, CA 93107-5634
PO BOX 15635, SANTA BARBARA, CA 93107-5635
PO BOX 15636, SANTA BARBARA, CA 93107-5636
PO BOX 15637, SANTA BARBARA, CA 93107-5637
PO BOX 15638, SANTA BARBARA, CA 93107-5638
PO BOX 15639, SANTA BARBARA, CA 93107-5639
PO BOX 15640, SANTA BARBARA, CA 93107-5640
PO BOX 15641, SANTA BARBARA, CA 93107-5641
PO BOX 15642, SANTA BARBARA, CA 93107-5642
PO BOX 15643, SANTA BARBARA, CA 93107-5643
PO BOX 15644, SANTA BARBARA, CA 93107-5644
PO BOX 15645, SANTA BARBARA, CA 93107-5645
PO BOX 15646, SANTA BARBARA, CA 93107-5646
PO BOX 15647, SANTA BARBARA, CA 93107-5647
PO BOX 15648, SANTA BARBARA, CA 93107-5648
PO BOX 15649, SANTA BARBARA, CA 93107-5649
PO BOX 15650, SANTA BARBARA, CA 93107-5650
PO BOX 15651, SANTA BARBARA, CA 93107-5651
PO BOX 15652, SANTA BARBARA, CA 93107-5652
PO BOX 15653, SANTA BARBARA, CA 93107-5653
PO BOX 15654, SANTA BARBARA, CA 93107-5654
PO BOX 15655, SANTA BARBARA, CA 93107-5655
PO BOX 15656, SANTA BARBARA, CA 93107-5656
PO BOX 15657, SANTA BARBARA, CA 93107-5657
PO BOX 15658, SANTA BARBARA, CA 93107-5658
PO BOX 15659, SANTA BARBARA, CA 93107-5659
PO BOX 15660, SANTA BARBARA, CA 93107-5660
PO BOX 15661, SANTA BARBARA, CA 93107-5661
PO BOX 15662, SANTA BARBARA, CA 93107-5662
PO BOX 15663, SANTA BARBARA, CA 93107-5663
PO BOX 15664, SANTA BARBARA, CA 93107-5664
PO BOX 15665, SANTA BARBARA, CA 93107-5665
PO BOX 15666, SANTA BARBARA, CA 93107-5666
PO BOX 15667, SANTA BARBARA, CA 93107-5667
PO BOX 15668, SANTA BARBARA, CA 93107-5668
PO BOX 15669, SANTA BARBARA, CA 93107-5669
PO BOX 15670, SANTA BARBARA, CA 93107-5670
PO BOX 15671, SANTA BARBARA, CA 93107-5671
PO BOX 15672, SANTA BARBARA, CA 93107-5672
PO BOX 15673, SANTA BARBARA, CA 93107-5673
PO BOX 15674, SANTA BARBARA, CA 93107-5674
PO BOX 15675, SANTA BARBARA, CA 93107-5675
PO BOX 15676, SANTA BARBARA, CA 93107-5676
PO BOX 15677, SANTA BARBARA, CA 93107-5677
PO BOX 15678, SANTA BARBARA, CA 93107-5678
PO BOX 15679, SANTA BARBARA, CA 93107-5679
PO BOX 15680, SANTA BARBARA, CA 93107-5680
PO BOX 15681, SANTA BARBARA, CA 93107-5681
PO BOX 15682, SANTA BARBARA, CA 93107-5682
PO BOX 15683, SANTA BARBARA, CA 93107-5683
PO BOX 15684, SANTA BARBARA, CA 93107-5684
PO BOX 15685, SANTA BARBARA, CA 93107-5685
PO BOX 15686, SANTA BARBARA, CA 93107-5686
PO BOX 15687, SANTA BARBARA, CA 93107-5687
PO BOX 15688, SANTA BARBARA, CA 93107-5688
PO BOX 15689, SANTA BARBARA, CA 93107-5689
PO BOX 15690, SANTA BARBARA, CA 93107-5690
PO BOX 15691, SANTA BARBARA, CA 93107-5691
PO BOX 15692, SANTA BARBARA, CA 93107-5692
PO BOX 15693, SANTA BARBARA, CA 93107-5693
PO BOX 15694, SANTA BARBARA, CA 93107-5694
PO BOX 15695, SANTA BARBARA, CA 93107-5695
PO BOX 15696, SANTA BARBARA, CA 93107-5696
PO BOX 15697, SANTA BARBARA, CA 93107-5697
PO BOX 15698, SANTA BARBARA, CA 93107-5698
PO BOX 15699, SANTA BARBARA, CA 93107-5699
PO BOX 15700, SANTA BARBARA, CA 93107-5700
PO BOX 15701, SANTA BARBARA, CA 93107-5701
PO BOX 15702, SANTA BARBARA, CA 93107-5702
PO BOX 15703, SANTA BARBARA, CA 93107-5703
PO BOX 15704, SANTA BARBARA, CA 93107-5704
PO BOX 15705, SANTA BARBARA, CA 93107-5705
PO BOX 15706, SANTA BARBARA, CA 93107-5706
PO BOX 15707, SANTA BARBARA, CA 93107-5707
PO BOX 15708, SANTA BARBARA, CA 93107-5708
PO BOX 15709, SANTA BARBARA, CA 93107-5709
PO BOX 15710, SANTA BARBARA, CA 93107-5710
PO BOX 15711, SANTA BARBARA, CA 93107-5711
PO BOX 15712, SANTA BARBARA, CA 93107-5712
PO BOX 15713, SANTA BARBARA, CA 93107-5713
PO BOX 15714, SANTA BARBARA, CA 93107-5714
PO BOX 15715, SANTA BARBARA, CA 93107-5715
PO BOX 15716, SANTA BARBARA, CA 93107-5716
PO BOX 15717, SANTA BARBARA, CA 93107-5717
PO BOX 15718, SANTA BARBARA, CA 93107-5718
PO BOX 15719, SANTA BARBARA, CA 93107-5719
PO BOX 15720, SANTA BARBARA, CA 93107-5720
PO BOX 15721, SANTA BARBARA, CA 93107-5721
PO BOX 15722, SANTA BARBARA, CA 93107-5722
PO BOX 15723, SANTA BARBARA, CA 93107-5723
PO BOX 15724, SANTA BARBARA, CA 93107-5724
PO BOX 15725, SANTA BARBARA, CA 93107-5725
PO BOX 15726, SANTA BARBARA, CA 93107-5726
PO BOX 15727, SANTA BARBARA, CA 93107-5727
PO BOX 15728, SANTA BARBARA, CA 93107-5728
PO BOX 15729, SANTA BARBARA, CA 93107-5729
PO BOX 15730, SANTA BARBARA, CA 93107-5730
PO BOX 15731, SANTA BARBARA, CA 93107-5731
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