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 19781, SOUTH LAKE TAHOE, CA 96151-0781
PO BOX 19782, SOUTH LAKE TAHOE, CA 96151-0782
PO BOX 19783, SOUTH LAKE TAHOE, CA 96151-0783
PO BOX 19784, SOUTH LAKE TAHOE, CA 96151-0784
PO BOX 19785, SOUTH LAKE TAHOE, CA 96151-0785
PO BOX 19786, SOUTH LAKE TAHOE, CA 96151-0786
PO BOX 19787, SOUTH LAKE TAHOE, CA 96151-0787
PO BOX 19788, SOUTH LAKE TAHOE, CA 96151-0788
PO BOX 19789, SOUTH LAKE TAHOE, CA 96151-0789
PO BOX 19790, SOUTH LAKE TAHOE, CA 96151-0790
PO BOX 19791, SOUTH LAKE TAHOE, CA 96151-0791
PO BOX 19792, SOUTH LAKE TAHOE, CA 96151-0792
PO BOX 19793, SOUTH LAKE TAHOE, CA 96151-0793
PO BOX 19794, SOUTH LAKE TAHOE, CA 96151-0794
PO BOX 19795, SOUTH LAKE TAHOE, CA 96151-0795
PO BOX 19796, SOUTH LAKE TAHOE, CA 96151-0796
PO BOX 19797, SOUTH LAKE TAHOE, CA 96151-0797
PO BOX 19798, SOUTH LAKE TAHOE, CA 96151-0798
PO BOX 19799, SOUTH LAKE TAHOE, CA 96151-0799
PO BOX 19800, SOUTH LAKE TAHOE, CA 96151-0800
PO BOX 19801, SOUTH LAKE TAHOE, CA 96151-0801
PO BOX 19802, SOUTH LAKE TAHOE, CA 96151-0802
PO BOX 19803, SOUTH LAKE TAHOE, CA 96151-0803
PO BOX 19804, SOUTH LAKE TAHOE, CA 96151-0804
PO BOX 19805, SOUTH LAKE TAHOE, CA 96151-0805
PO BOX 19806, SOUTH LAKE TAHOE, CA 96151-0806
PO BOX 19807, SOUTH LAKE TAHOE, CA 96151-0807
PO BOX 19808, SOUTH LAKE TAHOE, CA 96151-0808
PO BOX 19809, SOUTH LAKE TAHOE, CA 96151-0809
PO BOX 19810, SOUTH LAKE TAHOE, CA 96151-0810
PO BOX 19811, SOUTH LAKE TAHOE, CA 96151-0811
PO BOX 19812, SOUTH LAKE TAHOE, CA 96151-0812
PO BOX 19813, SOUTH LAKE TAHOE, CA 96151-0813
PO BOX 19814, SOUTH LAKE TAHOE, CA 96151-0814
PO BOX 19815, SOUTH LAKE TAHOE, CA 96151-0815
PO BOX 19816, SOUTH LAKE TAHOE, CA 96151-0816
PO BOX 19817, SOUTH LAKE TAHOE, CA 96151-0817
PO BOX 19818, SOUTH LAKE TAHOE, CA 96151-0818
PO BOX 19819, SOUTH LAKE TAHOE, CA 96151-0819
PO BOX 19820, SOUTH LAKE TAHOE, CA 96151-0820
PO BOX 19821, SOUTH LAKE TAHOE, CA 96151-0821
PO BOX 19822, SOUTH LAKE TAHOE, CA 96151-0822
PO BOX 19823, SOUTH LAKE TAHOE, CA 96151-0823
PO BOX 19824, SOUTH LAKE TAHOE, CA 96151-0824
PO BOX 19825, SOUTH LAKE TAHOE, CA 96151-0825
PO BOX 19826, SOUTH LAKE TAHOE, CA 96151-0826
PO BOX 19827, SOUTH LAKE TAHOE, CA 96151-0827
PO BOX 19828, SOUTH LAKE TAHOE, CA 96151-0828
PO BOX 19829, SOUTH LAKE TAHOE, CA 96151-0829
PO BOX 19830, SOUTH LAKE TAHOE, CA 96151-0830
PO BOX 19831, SOUTH LAKE TAHOE, CA 96151-0831
PO BOX 19832, SOUTH LAKE TAHOE, CA 96151-0832
PO BOX 19833, SOUTH LAKE TAHOE, CA 96151-0833
PO BOX 19834, SOUTH LAKE TAHOE, CA 96151-0834
PO BOX 19835, SOUTH LAKE TAHOE, CA 96151-0835
PO BOX 19836, SOUTH LAKE TAHOE, CA 96151-0836
PO BOX 19837, SOUTH LAKE TAHOE, CA 96151-0837
PO BOX 19838, SOUTH LAKE TAHOE, CA 96151-0838
PO BOX 19839, SOUTH LAKE TAHOE, CA 96151-0839
PO BOX 19840, SOUTH LAKE TAHOE, CA 96151-0840
PO BOX 19841, SOUTH LAKE TAHOE, CA 96151-0841
PO BOX 19842, SOUTH LAKE TAHOE, CA 96151-0842
PO BOX 19843, SOUTH LAKE TAHOE, CA 96151-0843
PO BOX 19844, SOUTH LAKE TAHOE, CA 96151-0844
PO BOX 19845, SOUTH LAKE TAHOE, CA 96151-0845
PO BOX 19846, SOUTH LAKE TAHOE, CA 96151-0846
PO BOX 19847, SOUTH LAKE TAHOE, CA 96151-0847
PO BOX 19848, SOUTH LAKE TAHOE, CA 96151-0848
PO BOX 19849, SOUTH LAKE TAHOE, CA 96151-0849
PO BOX 19850, SOUTH LAKE TAHOE, CA 96151-0850
PO BOX 19851, SOUTH LAKE TAHOE, CA 96151-0851
PO BOX 19852, SOUTH LAKE TAHOE, CA 96151-0852
PO BOX 19853, SOUTH LAKE TAHOE, CA 96151-0853
PO BOX 19854, SOUTH LAKE TAHOE, CA 96151-0854
PO BOX 19855, SOUTH LAKE TAHOE, CA 96151-0855
PO BOX 19856, SOUTH LAKE TAHOE, CA 96151-0856
PO BOX 19857, SOUTH LAKE TAHOE, CA 96151-0857
PO BOX 19858, SOUTH LAKE TAHOE, CA 96151-0858
PO BOX 19859, SOUTH LAKE TAHOE, CA 96151-0859
PO BOX 19860, SOUTH LAKE TAHOE, CA 96151-0860
PO BOX 19861, SOUTH LAKE TAHOE, CA 96151-0861
PO BOX 19862, SOUTH LAKE TAHOE, CA 96151-0862
PO BOX 19863, SOUTH LAKE TAHOE, CA 96151-0863
PO BOX 19864, SOUTH LAKE TAHOE, CA 96151-0864
PO BOX 19865, SOUTH LAKE TAHOE, CA 96151-0865
PO BOX 19866, SOUTH LAKE TAHOE, CA 96151-0866
PO BOX 19867, SOUTH LAKE TAHOE, CA 96151-0867
PO BOX 19868, SOUTH LAKE TAHOE, CA 96151-0868
PO BOX 19869, SOUTH LAKE TAHOE, CA 96151-0869
PO BOX 19870, SOUTH LAKE TAHOE, CA 96151-0870
PO BOX 19871, SOUTH LAKE TAHOE, CA 96151-0871
PO BOX 19872, SOUTH LAKE TAHOE, CA 96151-0872
PO BOX 19873, SOUTH LAKE TAHOE, CA 96151-0873
PO BOX 19874, SOUTH LAKE TAHOE, CA 96151-0874
PO BOX 19875, SOUTH LAKE TAHOE, CA 96151-0875
PO BOX 19876, SOUTH LAKE TAHOE, CA 96151-0876
PO BOX 19877, SOUTH LAKE TAHOE, CA 96151-0877
PO BOX 19878, SOUTH LAKE TAHOE, CA 96151-0878
PO BOX 19879, SOUTH LAKE TAHOE, CA 96151-0879
PO BOX 19880, SOUTH LAKE TAHOE, CA 96151-0880
PO BOX 19881, SOUTH LAKE TAHOE, CA 96151-0881
PO BOX 19882, SOUTH LAKE TAHOE, CA 96151-0882
PO BOX 19883, SOUTH LAKE TAHOE, CA 96151-0883
PO BOX 19884, SOUTH LAKE TAHOE, CA 96151-0884
PO BOX 19885, SOUTH LAKE TAHOE, CA 96151-0885
PO BOX 19886, SOUTH LAKE TAHOE, CA 96151-0886
PO BOX 19887, SOUTH LAKE TAHOE, CA 96151-0887
PO BOX 19888, SOUTH LAKE TAHOE, CA 96151-0888
PO BOX 19889, SOUTH LAKE TAHOE, CA 96151-0889
PO BOX 19890, SOUTH LAKE TAHOE, CA 96151-0890
PO BOX 19891, SOUTH LAKE TAHOE, CA 96151-0891
PO BOX 19892, SOUTH LAKE TAHOE, CA 96151-0892
PO BOX 19893, SOUTH LAKE TAHOE, CA 96151-0893
PO BOX 19894, SOUTH LAKE TAHOE, CA 96151-0894
PO BOX 19895, SOUTH LAKE TAHOE, CA 96151-0895
PO BOX 19896, SOUTH LAKE TAHOE, CA 96151-0896
PO BOX 19897, SOUTH LAKE TAHOE, CA 96151-0897
PO BOX 19898, SOUTH LAKE TAHOE, CA 96151-0898
PO BOX 19899, SOUTH LAKE TAHOE, CA 96151-0899
PO BOX 19900, SOUTH LAKE TAHOE, CA 96151-0900
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