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 16711, SAN DIEGO, CA 92176-6711
PO BOX 16712, SAN DIEGO, CA 92176-6712
PO BOX 16713, SAN DIEGO, CA 92176-6713
PO BOX 16714, SAN DIEGO, CA 92176-6714
PO BOX 16715, SAN DIEGO, CA 92176-6715
PO BOX 16716, SAN DIEGO, CA 92176-6716
PO BOX 16717, SAN DIEGO, CA 92176-6717
PO BOX 16718, SAN DIEGO, CA 92176-6718
PO BOX 16719, SAN DIEGO, CA 92176-6719
PO BOX 16720, SAN DIEGO, CA 92176-6720
PO BOX 16721, SAN DIEGO, CA 92176-6721
PO BOX 16722, SAN DIEGO, CA 92176-6722
PO BOX 16723, SAN DIEGO, CA 92176-6723
PO BOX 16724, SAN DIEGO, CA 92176-6724
PO BOX 16725, SAN DIEGO, CA 92176-6725
PO BOX 16726, SAN DIEGO, CA 92176-6726
PO BOX 16727, SAN DIEGO, CA 92176-6727
PO BOX 16728, SAN DIEGO, CA 92176-6728
PO BOX 16729, SAN DIEGO, CA 92176-6729
PO BOX 16730, SAN DIEGO, CA 92176-6730
PO BOX 16731, SAN DIEGO, CA 92176-6731
PO BOX 16732, SAN DIEGO, CA 92176-6732
PO BOX 16733, SAN DIEGO, CA 92176-6733
PO BOX 16734, SAN DIEGO, CA 92176-6734
PO BOX 16735, SAN DIEGO, CA 92176-6735
PO BOX 16736, SAN DIEGO, CA 92176-6736
PO BOX 16737, SAN DIEGO, CA 92176-6737
PO BOX 16738, SAN DIEGO, CA 92176-6738
PO BOX 16739, SAN DIEGO, CA 92176-6739
PO BOX 16740, SAN DIEGO, CA 92176-6740
PO BOX 16741, SAN DIEGO, CA 92176-6741
PO BOX 16742, SAN DIEGO, CA 92176-6742
PO BOX 16743, SAN DIEGO, CA 92176-6743
PO BOX 16744, SAN DIEGO, CA 92176-6744
PO BOX 16745, SAN DIEGO, CA 92176-6745
PO BOX 16746, SAN DIEGO, CA 92176-6746
PO BOX 16747, SAN DIEGO, CA 92176-6747
PO BOX 16748, SAN DIEGO, CA 92176-6748
PO BOX 16749, SAN DIEGO, CA 92176-6749
PO BOX 16750, SAN DIEGO, CA 92176-6750
PO BOX 16751, SAN DIEGO, CA 92176-6751
PO BOX 16752, SAN DIEGO, CA 92176-6752
PO BOX 16753, SAN DIEGO, CA 92176-6753
PO BOX 16754, SAN DIEGO, CA 92176-6754
PO BOX 16755, SAN DIEGO, CA 92176-6755
PO BOX 16756, SAN DIEGO, CA 92176-6756
PO BOX 16757, SAN DIEGO, CA 92176-6757
PO BOX 16758, SAN DIEGO, CA 92176-6758
PO BOX 16759, SAN DIEGO, CA 92176-6759
PO BOX 16760, SAN DIEGO, CA 92176-6760
PO BOX 16761, SAN DIEGO, CA 92176-6761
PO BOX 16762, SAN DIEGO, CA 92176-6762
PO BOX 16763, SAN DIEGO, CA 92176-6763
PO BOX 16764, SAN DIEGO, CA 92176-6764
PO BOX 16765, SAN DIEGO, CA 92176-6765
PO BOX 16766, SAN DIEGO, CA 92176-6766
PO BOX 16767, SAN DIEGO, CA 92176-6767
PO BOX 16768, SAN DIEGO, CA 92176-6768
PO BOX 16769, SAN DIEGO, CA 92176-6769
PO BOX 16770, SAN DIEGO, CA 92176-6770
PO BOX 16771, SAN DIEGO, CA 92176-6771
PO BOX 16772, SAN DIEGO, CA 92176-6772
PO BOX 16773, SAN DIEGO, CA 92176-6773
PO BOX 16774, SAN DIEGO, CA 92176-6774
PO BOX 16775, SAN DIEGO, CA 92176-6775
PO BOX 16776, SAN DIEGO, CA 92176-6776
PO BOX 16777, SAN DIEGO, CA 92176-6777
PO BOX 16778, SAN DIEGO, CA 92176-6778
PO BOX 16779, SAN DIEGO, CA 92176-6779
PO BOX 16780, SAN DIEGO, CA 92176-6780
PO BOX 16781, SAN DIEGO, CA 92176-6781
PO BOX 16782, SAN DIEGO, CA 92176-6782
PO BOX 16783, SAN DIEGO, CA 92176-6783
PO BOX 16784, SAN DIEGO, CA 92176-6784
PO BOX 16785, SAN DIEGO, CA 92176-6785
PO BOX 16786, SAN DIEGO, CA 92176-6786
PO BOX 16787, SAN DIEGO, CA 92176-6787
PO BOX 16788, SAN DIEGO, CA 92176-6788
PO BOX 16789, SAN DIEGO, CA 92176-6789
PO BOX 16790, SAN DIEGO, CA 92176-6790
PO BOX 16791, SAN DIEGO, CA 92176-6791
PO BOX 16792, SAN DIEGO, CA 92176-6792
PO BOX 16793, SAN DIEGO, CA 92176-6793
PO BOX 16794, SAN DIEGO, CA 92176-6794
PO BOX 16795, SAN DIEGO, CA 92176-6795
PO BOX 16796, SAN DIEGO, CA 92176-6796
PO BOX 16797, SAN DIEGO, CA 92176-6797
PO BOX 16798, SAN DIEGO, CA 92176-6798
PO BOX 16799, SAN DIEGO, CA 92176-6799
PO BOX 16800, SAN DIEGO, CA 92176-6800
PO BOX 16801, SAN DIEGO, CA 92176-6801
PO BOX 16802, SAN DIEGO, CA 92176-6802
PO BOX 16803, SAN DIEGO, CA 92176-6803
PO BOX 16804, SAN DIEGO, CA 92176-6804
PO BOX 16805, SAN DIEGO, CA 92176-6805
PO BOX 16806, SAN DIEGO, CA 92176-6806
PO BOX 16807, SAN DIEGO, CA 92176-6807
PO BOX 16808, SAN DIEGO, CA 92176-6808
PO BOX 16809, SAN DIEGO, CA 92176-6809
PO BOX 16810, SAN DIEGO, CA 92176-6810
PO BOX 16811, SAN DIEGO, CA 92176-6811
PO BOX 16812, SAN DIEGO, CA 92176-6812
PO BOX 16813, SAN DIEGO, CA 92176-6813
PO BOX 16814, SAN DIEGO, CA 92176-6814
PO BOX 16815, SAN DIEGO, CA 92176-6815
PO BOX 16816, SAN DIEGO, CA 92176-6816
PO BOX 16817, SAN DIEGO, CA 92176-6817
PO BOX 16818, SAN DIEGO, CA 92176-6818
PO BOX 16819, SAN DIEGO, CA 92176-6819
PO BOX 16820, SAN DIEGO, CA 92176-6820
PO BOX 16821, SAN DIEGO, CA 92176-6821
PO BOX 16822, SAN DIEGO, CA 92176-6822
PO BOX 16823, SAN DIEGO, CA 92176-6823
PO BOX 16824, SAN DIEGO, CA 92176-6824
PO BOX 16825, SAN DIEGO, CA 92176-6825
PO BOX 16826, SAN DIEGO, CA 92176-6826
PO BOX 16827, SAN DIEGO, CA 92176-6827
PO BOX 16828, SAN DIEGO, CA 92176-6828
PO BOX 16829, SAN DIEGO, CA 92176-6829
PO BOX 16830, SAN DIEGO, CA 92176-6830
PO BOX 16831, SAN DIEGO, CA 92176-6831
PO BOX 16832, SAN DIEGO, CA 92176-6832
PO BOX 16833, SAN DIEGO, CA 92176-6833
PO BOX 16834, SAN DIEGO, CA 92176-6834
PO BOX 16835, SAN DIEGO, CA 92176-6835
PO BOX 16836, SAN DIEGO, CA 92176-6836
PO BOX 16837, SAN DIEGO, CA 92176-6837
PO BOX 16838, SAN DIEGO, CA 92176-6838
PO BOX 16839, SAN DIEGO, CA 92176-6839
PO BOX 16840, SAN DIEGO, CA 92176-6840
PO BOX 16841, SAN DIEGO, CA 92176-6841
PO BOX 16842, SAN DIEGO, CA 92176-6842
PO BOX 16843, SAN DIEGO, CA 92176-6843
PO BOX 16844, SAN DIEGO, CA 92176-6844
PO BOX 16845, SAN DIEGO, CA 92176-6845
PO BOX 16846, SAN DIEGO, CA 92176-6846
PO BOX 16847, SAN DIEGO, CA 92176-6847
PO BOX 16848, SAN DIEGO, CA 92176-6848
PO BOX 16849, SAN DIEGO, CA 92176-6849
PO BOX 16850, SAN DIEGO, CA 92176-6850
PO BOX 16851, SAN DIEGO, CA 92176-6851
PO BOX 16852, SAN DIEGO, CA 92176-6852
PO BOX 16853, SAN DIEGO, CA 92176-6853
PO BOX 16854, SAN DIEGO, CA 92176-6854
PO BOX 16855, SAN DIEGO, CA 92176-6855
PO BOX 16856, SAN DIEGO, CA 92176-6856
PO BOX 16857, SAN DIEGO, CA 92176-6857
PO BOX 16858, SAN DIEGO, CA 92176-6858
PO BOX 16859, SAN DIEGO, CA 92176-6859
PO BOX 16860, SAN DIEGO, CA 92176-6860
PO BOX 16861, SAN DIEGO, CA 92176-6861
PO BOX 16862, SAN DIEGO, CA 92176-6862
PO BOX 16863, SAN DIEGO, CA 92176-6863
PO BOX 16864, SAN DIEGO, CA 92176-6864
PO BOX 16865, SAN DIEGO, CA 92176-6865
PO BOX 16866, SAN DIEGO, CA 92176-6866
PO BOX 16867, SAN DIEGO, CA 92176-6867
PO BOX 16868, SAN DIEGO, CA 92176-6868
PO BOX 16869, SAN DIEGO, CA 92176-6869
PO BOX 16870, SAN DIEGO, CA 92176-6870
PO BOX 16871, SAN DIEGO, CA 92176-6871
PO BOX 16872, SAN DIEGO, CA 92176-6872
PO BOX 16873, SAN DIEGO, CA 92176-6873
PO BOX 16874, SAN DIEGO, CA 92176-6874
PO BOX 16875, SAN DIEGO, CA 92176-6875
PO BOX 16876, SAN DIEGO, CA 92176-6876
PO BOX 16877, SAN DIEGO, CA 92176-6877
PO BOX 16878, SAN DIEGO, CA 92176-6878
PO BOX 16879, SAN DIEGO, CA 92176-6879
PO BOX 16880, SAN DIEGO, CA 92176-6880
PO BOX 16881, SAN DIEGO, CA 92176-6881
PO BOX 16882, SAN DIEGO, CA 92176-6882
PO BOX 16883, SAN DIEGO, CA 92176-6883
PO BOX 16884, SAN DIEGO, CA 92176-6884
PO BOX 16885, SAN DIEGO, CA 92176-6885
PO BOX 16886, SAN DIEGO, CA 92176-6886
PO BOX 16887, SAN DIEGO, CA 92176-6887
PO BOX 16888, SAN DIEGO, CA 92176-6888
PO BOX 16889, SAN DIEGO, CA 92176-6889
PO BOX 16890, SAN DIEGO, CA 92176-6890
PO BOX 16891, SAN DIEGO, CA 92176-6891
PO BOX 16892, SAN DIEGO, CA 92176-6892
PO BOX 16893, SAN DIEGO, CA 92176-6893
PO BOX 16894, SAN DIEGO, CA 92176-6894
PO BOX 16895, SAN DIEGO, CA 92176-6895
PO BOX 16896, SAN DIEGO, CA 92176-6896
PO BOX 16897, SAN DIEGO, CA 92176-6897
PO BOX 16898, SAN DIEGO, CA 92176-6898
PO BOX 16899, SAN DIEGO, CA 92176-6899
PO BOX 16900, SAN DIEGO, CA 92176-6900
PO BOX 16901, SAN DIEGO, CA 92176-6901
PO BOX 16902, SAN DIEGO, CA 92176-6902
PO BOX 16903, SAN DIEGO, CA 92176-6903
PO BOX 16904, SAN DIEGO, CA 92176-6904
PO BOX 16905, SAN DIEGO, CA 92176-6905
PO BOX 16906, SAN DIEGO, CA 92176-6906
PO BOX 16907, SAN DIEGO, CA 92176-6907
PO BOX 16908, SAN DIEGO, CA 92176-6908
PO BOX 16909, SAN DIEGO, CA 92176-6909
PO BOX 16910, SAN DIEGO, CA 92176-6910
PO BOX 16911, SAN DIEGO, CA 92176-6911
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