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 4721, OCEANSIDE, CA 92052-4721
PO BOX 4722, OCEANSIDE, CA 92052-4722
PO BOX 4723, OCEANSIDE, CA 92052-4723
PO BOX 4724, OCEANSIDE, CA 92052-4724
PO BOX 4725, OCEANSIDE, CA 92052-4725
PO BOX 4726, OCEANSIDE, CA 92052-4726
PO BOX 4727, OCEANSIDE, CA 92052-4727
PO BOX 4728, OCEANSIDE, CA 92052-4728
PO BOX 4729, OCEANSIDE, CA 92052-4729
PO BOX 4730, OCEANSIDE, CA 92052-4730
PO BOX 4731, OCEANSIDE, CA 92052-4731
PO BOX 4732, OCEANSIDE, CA 92052-4732
PO BOX 4733, OCEANSIDE, CA 92052-4733
PO BOX 4734, OCEANSIDE, CA 92052-4734
PO BOX 4735, OCEANSIDE, CA 92052-4735
PO BOX 4736, OCEANSIDE, CA 92052-4736
PO BOX 4737, OCEANSIDE, CA 92052-4737
PO BOX 4738, OCEANSIDE, CA 92052-4738
PO BOX 4739, OCEANSIDE, CA 92052-4739
PO BOX 4740, OCEANSIDE, CA 92052-4740
PO BOX 4741, OCEANSIDE, CA 92052-4741
PO BOX 4742, OCEANSIDE, CA 92052-4742
PO BOX 4743, OCEANSIDE, CA 92052-4743
PO BOX 4744, OCEANSIDE, CA 92052-4744
PO BOX 4745, OCEANSIDE, CA 92052-4745
PO BOX 4746, OCEANSIDE, CA 92052-4746
PO BOX 4747, OCEANSIDE, CA 92052-4747
PO BOX 4748, OCEANSIDE, CA 92052-4748
PO BOX 4749, OCEANSIDE, CA 92052-4749
PO BOX 4750, OCEANSIDE, CA 92052-4750
PO BOX 4751, OCEANSIDE, CA 92052-4751
PO BOX 4752, OCEANSIDE, CA 92052-4752
PO BOX 4753, OCEANSIDE, CA 92052-4753
PO BOX 4754, OCEANSIDE, CA 92052-4754
PO BOX 4755, OCEANSIDE, CA 92052-4755
PO BOX 4756, OCEANSIDE, CA 92052-4756
PO BOX 4757, OCEANSIDE, CA 92052-4757
PO BOX 4758, OCEANSIDE, CA 92052-4758
PO BOX 4759, OCEANSIDE, CA 92052-4759
PO BOX 4760, OCEANSIDE, CA 92052-4760
PO BOX 4761, OCEANSIDE, CA 92052-4761
PO BOX 4762, OCEANSIDE, CA 92052-4762
PO BOX 4763, OCEANSIDE, CA 92052-4763
PO BOX 4764, OCEANSIDE, CA 92052-4764
PO BOX 4765, OCEANSIDE, CA 92052-4765
PO BOX 4766, OCEANSIDE, CA 92052-4766
PO BOX 4767, OCEANSIDE, CA 92052-4767
PO BOX 4768, OCEANSIDE, CA 92052-4768
PO BOX 4769, OCEANSIDE, CA 92052-4769
PO BOX 4770, OCEANSIDE, CA 92052-4770
PO BOX 4771, OCEANSIDE, CA 92052-4771
PO BOX 4772, OCEANSIDE, CA 92052-4772
PO BOX 4773, OCEANSIDE, CA 92052-4773
PO BOX 4774, OCEANSIDE, CA 92052-4774
PO BOX 4775, OCEANSIDE, CA 92052-4775
PO BOX 4776, OCEANSIDE, CA 92052-4776
PO BOX 4777, OCEANSIDE, CA 92052-4777
PO BOX 4778, OCEANSIDE, CA 92052-4778
PO BOX 4779, OCEANSIDE, CA 92052-4779
PO BOX 4780, OCEANSIDE, CA 92052-4780
PO BOX 4781, OCEANSIDE, CA 92052-4781
PO BOX 4782, OCEANSIDE, CA 92052-4782
PO BOX 4783, OCEANSIDE, CA 92052-4783
PO BOX 4784, OCEANSIDE, CA 92052-4784
PO BOX 4785, OCEANSIDE, CA 92052-4785
PO BOX 4786, OCEANSIDE, CA 92052-4786
PO BOX 4787, OCEANSIDE, CA 92052-4787
PO BOX 4788, OCEANSIDE, CA 92052-4788
PO BOX 4789, OCEANSIDE, CA 92052-4789
PO BOX 4790, OCEANSIDE, CA 92052-4790
PO BOX 4791, OCEANSIDE, CA 92052-4791
PO BOX 4792, OCEANSIDE, CA 92052-4792
PO BOX 4793, OCEANSIDE, CA 92052-4793
PO BOX 4794, OCEANSIDE, CA 92052-4794
PO BOX 4795, OCEANSIDE, CA 92052-4795
PO BOX 4796, OCEANSIDE, CA 92052-4796
PO BOX 4797, OCEANSIDE, CA 92052-4797
PO BOX 4798, OCEANSIDE, CA 92052-4798
PO BOX 4799, OCEANSIDE, CA 92052-4799
PO BOX 4800, OCEANSIDE, CA 92052-4800
PO BOX 4801, OCEANSIDE, CA 92052-4801
PO BOX 4802, OCEANSIDE, CA 92052-4802
PO BOX 4803, OCEANSIDE, CA 92052-4803
PO BOX 4804, OCEANSIDE, CA 92052-4804
PO BOX 4805, OCEANSIDE, CA 92052-4805
PO BOX 4806, OCEANSIDE, CA 92052-4806
PO BOX 4807, OCEANSIDE, CA 92052-4807
PO BOX 4808, OCEANSIDE, CA 92052-4808
PO BOX 4809, OCEANSIDE, CA 92052-4809
PO BOX 4810, OCEANSIDE, CA 92052-4810
PO BOX 4811, OCEANSIDE, CA 92052-4811
PO BOX 4812, OCEANSIDE, CA 92052-4812
PO BOX 4813, OCEANSIDE, CA 92052-4813
PO BOX 4814, OCEANSIDE, CA 92052-4814
PO BOX 4815, OCEANSIDE, CA 92052-4815
PO BOX 4816, OCEANSIDE, CA 92052-4816
PO BOX 4817, OCEANSIDE, CA 92052-4817
PO BOX 4818, OCEANSIDE, CA 92052-4818
PO BOX 4819, OCEANSIDE, CA 92052-4819
PO BOX 4820, OCEANSIDE, CA 92052-4820
PO BOX 4821, OCEANSIDE, CA 92052-4821
PO BOX 4822, OCEANSIDE, CA 92052-4822
PO BOX 4823, OCEANSIDE, CA 92052-4823
PO BOX 4824, OCEANSIDE, CA 92052-4824
PO BOX 4825, OCEANSIDE, CA 92052-4825
PO BOX 4826, OCEANSIDE, CA 92052-4826
PO BOX 4827, OCEANSIDE, CA 92052-4827
PO BOX 4828, OCEANSIDE, CA 92052-4828
PO BOX 4829, OCEANSIDE, CA 92052-4829
PO BOX 4830, OCEANSIDE, CA 92052-4830
PO BOX 4831, OCEANSIDE, CA 92052-4831
PO BOX 4832, OCEANSIDE, CA 92052-4832
PO BOX 4833, OCEANSIDE, CA 92052-4833
PO BOX 4834, OCEANSIDE, CA 92052-4834
PO BOX 4835, OCEANSIDE, CA 92052-4835
PO BOX 4836, OCEANSIDE, CA 92052-4836
PO BOX 4837, OCEANSIDE, CA 92052-4837
PO BOX 4838, OCEANSIDE, CA 92052-4838
PO BOX 4839, OCEANSIDE, CA 92052-4839
PO BOX 4840, OCEANSIDE, CA 92052-4840
PO BOX 4841, OCEANSIDE, CA 92052-4841
PO BOX 4842, OCEANSIDE, CA 92052-4842
PO BOX 4843, OCEANSIDE, CA 92052-4843
PO BOX 4844, OCEANSIDE, CA 92052-4844
PO BOX 4845, OCEANSIDE, CA 92052-4845
PO BOX 4846, OCEANSIDE, CA 92052-4846
PO BOX 4847, OCEANSIDE, CA 92052-4847
PO BOX 4848, OCEANSIDE, CA 92052-4848
PO BOX 4849, OCEANSIDE, CA 92052-4849
PO BOX 4850, OCEANSIDE, CA 92052-4850
PO BOX 4851, OCEANSIDE, CA 92052-4851
PO BOX 4852, OCEANSIDE, CA 92052-4852
PO BOX 4853, OCEANSIDE, CA 92052-4853
PO BOX 4854, OCEANSIDE, CA 92052-4854
PO BOX 4855, OCEANSIDE, CA 92052-4855
PO BOX 4856, OCEANSIDE, CA 92052-4856
PO BOX 4857, OCEANSIDE, CA 92052-4857
PO BOX 4858, OCEANSIDE, CA 92052-4858
PO BOX 4859, OCEANSIDE, CA 92052-4859
PO BOX 4860, OCEANSIDE, CA 92052-4860
PO BOX 4861, OCEANSIDE, CA 92052-4861
PO BOX 4862, OCEANSIDE, CA 92052-4862
PO BOX 4863, OCEANSIDE, CA 92052-4863
PO BOX 4864, OCEANSIDE, CA 92052-4864
PO BOX 4865, OCEANSIDE, CA 92052-4865
PO BOX 4866, OCEANSIDE, CA 92052-4866
PO BOX 4867, OCEANSIDE, CA 92052-4867
PO BOX 4868, OCEANSIDE, CA 92052-4868
PO BOX 4869, OCEANSIDE, CA 92052-4869
PO BOX 4870, OCEANSIDE, CA 92052-4870
PO BOX 4871, OCEANSIDE, CA 92052-4871
PO BOX 4872, OCEANSIDE, CA 92052-4872
PO BOX 4873, OCEANSIDE, CA 92052-4873
PO BOX 4874, OCEANSIDE, CA 92052-4874
PO BOX 4875, OCEANSIDE, CA 92052-4875
PO BOX 4876, OCEANSIDE, CA 92052-4876
PO BOX 4877, OCEANSIDE, CA 92052-4877
PO BOX 4878, OCEANSIDE, CA 92052-4878
PO BOX 4879, OCEANSIDE, CA 92052-4879
PO BOX 4880, OCEANSIDE, CA 92052-4880
PO BOX 4881, OCEANSIDE, CA 92052-4881
PO BOX 4882, OCEANSIDE, CA 92052-4882
PO BOX 4883, OCEANSIDE, CA 92052-4883
PO BOX 4884, OCEANSIDE, CA 92052-4884
PO BOX 4885, OCEANSIDE, CA 92052-4885
PO BOX 4886, OCEANSIDE, CA 92052-4886
PO BOX 4887, OCEANSIDE, CA 92052-4887
PO BOX 4888, OCEANSIDE, CA 92052-4888
PO BOX 4889, OCEANSIDE, CA 92052-4889
PO BOX 4890, OCEANSIDE, CA 92052-4890
PO BOX 4891, OCEANSIDE, CA 92052-4891
PO BOX 4892, OCEANSIDE, CA 92052-4892
PO BOX 4893, OCEANSIDE, CA 92052-4893
PO BOX 4894, OCEANSIDE, CA 92052-4894
PO BOX 4895, OCEANSIDE, CA 92052-4895
PO BOX 4896, OCEANSIDE, CA 92052-4896
PO BOX 4897, OCEANSIDE, CA 92052-4897
PO BOX 4898, OCEANSIDE, CA 92052-4898
PO BOX 4899, OCEANSIDE, CA 92052-4899
PO BOX 4900, OCEANSIDE, CA 92052-4900
PO BOX 4901, OCEANSIDE, CA 92052-4901
PO BOX 4902, OCEANSIDE, CA 92052-4902
PO BOX 4903, OCEANSIDE, CA 92052-4903
PO BOX 4904, OCEANSIDE, CA 92052-4904
PO BOX 4905, OCEANSIDE, CA 92052-4905
PO BOX 4906, OCEANSIDE, CA 92052-4906
PO BOX 4907, OCEANSIDE, CA 92052-4907
PO BOX 4908, OCEANSIDE, CA 92052-4908
PO BOX 4909, OCEANSIDE, CA 92052-4909
PO BOX 4910, OCEANSIDE, CA 92052-4910
PO BOX 4911, OCEANSIDE, CA 92052-4911
PO BOX 4912, OCEANSIDE, CA 92052-4912
PO BOX 4913, OCEANSIDE, CA 92052-4913
PO BOX 4914, OCEANSIDE, CA 92052-4914
PO BOX 4915, OCEANSIDE, CA 92052-4915
PO BOX 4916, OCEANSIDE, CA 92052-4916
PO BOX 4917, OCEANSIDE, CA 92052-4917
PO BOX 4918, OCEANSIDE, CA 92052-4918
PO BOX 4919, OCEANSIDE, CA 92052-4919
PO BOX 4920, OCEANSIDE, CA 92052-4920
PO BOX 4921, OCEANSIDE, CA 92052-4921
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