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 4541, OCEANSIDE, CA 92052-4541
PO BOX 4542, OCEANSIDE, CA 92052-4542
PO BOX 4543, OCEANSIDE, CA 92052-4543
PO BOX 4544, OCEANSIDE, CA 92052-4544
PO BOX 4545, OCEANSIDE, CA 92052-4545
PO BOX 4546, OCEANSIDE, CA 92052-4546
PO BOX 4547, OCEANSIDE, CA 92052-4547
PO BOX 4548, OCEANSIDE, CA 92052-4548
PO BOX 4549, OCEANSIDE, CA 92052-4549
PO BOX 4550, OCEANSIDE, CA 92052-4550
PO BOX 4551, OCEANSIDE, CA 92052-4551
PO BOX 4552, OCEANSIDE, CA 92052-4552
PO BOX 4553, OCEANSIDE, CA 92052-4553
PO BOX 4554, OCEANSIDE, CA 92052-4554
PO BOX 4555, OCEANSIDE, CA 92052-4555
PO BOX 4556, OCEANSIDE, CA 92052-4556
PO BOX 4557, OCEANSIDE, CA 92052-4557
PO BOX 4558, OCEANSIDE, CA 92052-4558
PO BOX 4559, OCEANSIDE, CA 92052-4559
PO BOX 4560, OCEANSIDE, CA 92052-4560
PO BOX 4561, OCEANSIDE, CA 92052-4561
PO BOX 4562, OCEANSIDE, CA 92052-4562
PO BOX 4563, OCEANSIDE, CA 92052-4563
PO BOX 4564, OCEANSIDE, CA 92052-4564
PO BOX 4565, OCEANSIDE, CA 92052-4565
PO BOX 4566, OCEANSIDE, CA 92052-4566
PO BOX 4567, OCEANSIDE, CA 92052-4567
PO BOX 4568, OCEANSIDE, CA 92052-4568
PO BOX 4569, OCEANSIDE, CA 92052-4569
PO BOX 4570, OCEANSIDE, CA 92052-4570
PO BOX 4571, OCEANSIDE, CA 92052-4571
PO BOX 4572, OCEANSIDE, CA 92052-4572
PO BOX 4573, OCEANSIDE, CA 92052-4573
PO BOX 4574, OCEANSIDE, CA 92052-4574
PO BOX 4575, OCEANSIDE, CA 92052-4575
PO BOX 4576, OCEANSIDE, CA 92052-4576
PO BOX 4577, OCEANSIDE, CA 92052-4577
PO BOX 4578, OCEANSIDE, CA 92052-4578
PO BOX 4579, OCEANSIDE, CA 92052-4579
PO BOX 4580, OCEANSIDE, CA 92052-4580
PO BOX 4581, OCEANSIDE, CA 92052-4581
PO BOX 4582, OCEANSIDE, CA 92052-4582
PO BOX 4583, OCEANSIDE, CA 92052-4583
PO BOX 4584, OCEANSIDE, CA 92052-4584
PO BOX 4585, OCEANSIDE, CA 92052-4585
PO BOX 4586, OCEANSIDE, CA 92052-4586
PO BOX 4587, OCEANSIDE, CA 92052-4587
PO BOX 4588, OCEANSIDE, CA 92052-4588
PO BOX 4589, OCEANSIDE, CA 92052-4589
PO BOX 4590, OCEANSIDE, CA 92052-4590
PO BOX 4591, OCEANSIDE, CA 92052-4591
PO BOX 4592, OCEANSIDE, CA 92052-4592
PO BOX 4593, OCEANSIDE, CA 92052-4593
PO BOX 4594, OCEANSIDE, CA 92052-4594
PO BOX 4595, OCEANSIDE, CA 92052-4595
PO BOX 4596, OCEANSIDE, CA 92052-4596
PO BOX 4597, OCEANSIDE, CA 92052-4597
PO BOX 4598, OCEANSIDE, CA 92052-4598
PO BOX 4599, OCEANSIDE, CA 92052-4599
PO BOX 4600, OCEANSIDE, CA 92052-4600
PO BOX 4601, OCEANSIDE, CA 92052-4601
PO BOX 4602, OCEANSIDE, CA 92052-4602
PO BOX 4603, OCEANSIDE, CA 92052-4603
PO BOX 4604, OCEANSIDE, CA 92052-4604
PO BOX 4605, OCEANSIDE, CA 92052-4605
PO BOX 4606, OCEANSIDE, CA 92052-4606
PO BOX 4607, OCEANSIDE, CA 92052-4607
PO BOX 4608, OCEANSIDE, CA 92052-4608
PO BOX 4609, OCEANSIDE, CA 92052-4609
PO BOX 4610, OCEANSIDE, CA 92052-4610
PO BOX 4611, OCEANSIDE, CA 92052-4611
PO BOX 4612, OCEANSIDE, CA 92052-4612
PO BOX 4613, OCEANSIDE, CA 92052-4613
PO BOX 4614, OCEANSIDE, CA 92052-4614
PO BOX 4615, OCEANSIDE, CA 92052-4615
PO BOX 4616, OCEANSIDE, CA 92052-4616
PO BOX 4617, OCEANSIDE, CA 92052-4617
PO BOX 4618, OCEANSIDE, CA 92052-4618
PO BOX 4619, OCEANSIDE, CA 92052-4619
PO BOX 4620, OCEANSIDE, CA 92052-4620
PO BOX 4621, OCEANSIDE, CA 92052-4621
PO BOX 4622, OCEANSIDE, CA 92052-4622
PO BOX 4623, OCEANSIDE, CA 92052-4623
PO BOX 4624, OCEANSIDE, CA 92052-4624
PO BOX 4625, OCEANSIDE, CA 92052-4625
PO BOX 4626, OCEANSIDE, CA 92052-4626
PO BOX 4627, OCEANSIDE, CA 92052-4627
PO BOX 4628, OCEANSIDE, CA 92052-4628
PO BOX 4629, OCEANSIDE, CA 92052-4629
PO BOX 4630, OCEANSIDE, CA 92052-4630
PO BOX 4631, OCEANSIDE, CA 92052-4631
PO BOX 4632, OCEANSIDE, CA 92052-4632
PO BOX 4633, OCEANSIDE, CA 92052-4633
PO BOX 4634, OCEANSIDE, CA 92052-4634
PO BOX 4635, OCEANSIDE, CA 92052-4635
PO BOX 4636, OCEANSIDE, CA 92052-4636
PO BOX 4637, OCEANSIDE, CA 92052-4637
PO BOX 4638, OCEANSIDE, CA 92052-4638
PO BOX 4639, OCEANSIDE, CA 92052-4639
PO BOX 4640, OCEANSIDE, CA 92052-4640
PO BOX 4641, OCEANSIDE, CA 92052-4641
PO BOX 4642, OCEANSIDE, CA 92052-4642
PO BOX 4643, OCEANSIDE, CA 92052-4643
PO BOX 4644, OCEANSIDE, CA 92052-4644
PO BOX 4645, OCEANSIDE, CA 92052-4645
PO BOX 4646, OCEANSIDE, CA 92052-4646
PO BOX 4647, OCEANSIDE, CA 92052-4647
PO BOX 4648, OCEANSIDE, CA 92052-4648
PO BOX 4649, OCEANSIDE, CA 92052-4649
PO BOX 4650, OCEANSIDE, CA 92052-4650
PO BOX 4651, OCEANSIDE, CA 92052-4651
PO BOX 4652, OCEANSIDE, CA 92052-4652
PO BOX 4653, OCEANSIDE, CA 92052-4653
PO BOX 4654, OCEANSIDE, CA 92052-4654
PO BOX 4655, OCEANSIDE, CA 92052-4655
PO BOX 4656, OCEANSIDE, CA 92052-4656
PO BOX 4657, OCEANSIDE, CA 92052-4657
PO BOX 4658, OCEANSIDE, CA 92052-4658
PO BOX 4659, OCEANSIDE, CA 92052-4659
PO BOX 4660, OCEANSIDE, CA 92052-4660
PO BOX 4661, OCEANSIDE, CA 92052-4661
PO BOX 4662, OCEANSIDE, CA 92052-4662
PO BOX 4663, OCEANSIDE, CA 92052-4663
PO BOX 4664, OCEANSIDE, CA 92052-4664
PO BOX 4665, OCEANSIDE, CA 92052-4665
PO BOX 4666, OCEANSIDE, CA 92052-4666
PO BOX 4667, OCEANSIDE, CA 92052-4667
PO BOX 4668, OCEANSIDE, CA 92052-4668
PO BOX 4669, OCEANSIDE, CA 92052-4669
PO BOX 4670, OCEANSIDE, CA 92052-4670
PO BOX 4671, OCEANSIDE, CA 92052-4671
PO BOX 4672, OCEANSIDE, CA 92052-4672
PO BOX 4673, OCEANSIDE, CA 92052-4673
PO BOX 4674, OCEANSIDE, CA 92052-4674
PO BOX 4675, OCEANSIDE, CA 92052-4675
PO BOX 4676, OCEANSIDE, CA 92052-4676
PO BOX 4677, OCEANSIDE, CA 92052-4677
PO BOX 4678, OCEANSIDE, CA 92052-4678
PO BOX 4679, OCEANSIDE, CA 92052-4679
PO BOX 4680, OCEANSIDE, CA 92052-4680
PO BOX 4681, OCEANSIDE, CA 92052-4681
PO BOX 4682, OCEANSIDE, CA 92052-4682
PO BOX 4683, OCEANSIDE, CA 92052-4683
PO BOX 4684, OCEANSIDE, CA 92052-4684
PO BOX 4685, OCEANSIDE, CA 92052-4685
PO BOX 4686, OCEANSIDE, CA 92052-4686
PO BOX 4687, OCEANSIDE, CA 92052-4687
PO BOX 4688, OCEANSIDE, CA 92052-4688
PO BOX 4689, OCEANSIDE, CA 92052-4689
PO BOX 4690, OCEANSIDE, CA 92052-4690
PO BOX 4691, OCEANSIDE, CA 92052-4691
PO BOX 4692, OCEANSIDE, CA 92052-4692
PO BOX 4693, OCEANSIDE, CA 92052-4693
PO BOX 4694, OCEANSIDE, CA 92052-4694
PO BOX 4695, OCEANSIDE, CA 92052-4695
PO BOX 4696, OCEANSIDE, CA 92052-4696
PO BOX 4697, OCEANSIDE, CA 92052-4697
PO BOX 4698, OCEANSIDE, CA 92052-4698
PO BOX 4699, OCEANSIDE, CA 92052-4699
PO BOX 4700, OCEANSIDE, CA 92052-4700
PO BOX 4701, OCEANSIDE, CA 92052-4701
PO BOX 4702, OCEANSIDE, CA 92052-4702
PO BOX 4703, OCEANSIDE, CA 92052-4703
PO BOX 4704, OCEANSIDE, CA 92052-4704
PO BOX 4705, OCEANSIDE, CA 92052-4705
PO BOX 4706, OCEANSIDE, CA 92052-4706
PO BOX 4707, OCEANSIDE, CA 92052-4707
PO BOX 4708, OCEANSIDE, CA 92052-4708
PO BOX 4709, OCEANSIDE, CA 92052-4709
PO BOX 4710, OCEANSIDE, CA 92052-4710
PO BOX 4711, OCEANSIDE, CA 92052-4711
PO BOX 4712, OCEANSIDE, CA 92052-4712
PO BOX 4713, OCEANSIDE, CA 92052-4713
PO BOX 4714, OCEANSIDE, CA 92052-4714
PO BOX 4715, OCEANSIDE, CA 92052-4715
PO BOX 4716, OCEANSIDE, CA 92052-4716
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