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 28841, SAN DIEGO, CA 92198-0841
PO BOX 28842, SAN DIEGO, CA 92198-0842
PO BOX 28843, SAN DIEGO, CA 92198-0843
PO BOX 28844, SAN DIEGO, CA 92198-0844
PO BOX 28845, SAN DIEGO, CA 92198-0845
PO BOX 28846, SAN DIEGO, CA 92198-0846
PO BOX 28847, SAN DIEGO, CA 92198-0847
PO BOX 28848, SAN DIEGO, CA 92198-0848
PO BOX 28849, SAN DIEGO, CA 92198-0849
PO BOX 28850, SAN DIEGO, CA 92198-0850
PO BOX 28851, SAN DIEGO, CA 92198-0851
PO BOX 28852, SAN DIEGO, CA 92198-0852
PO BOX 28853, SAN DIEGO, CA 92198-0853
PO BOX 28854, SAN DIEGO, CA 92198-0854
PO BOX 28855, SAN DIEGO, CA 92198-0855
PO BOX 28856, SAN DIEGO, CA 92198-0856
PO BOX 28857, SAN DIEGO, CA 92198-0857
PO BOX 28858, SAN DIEGO, CA 92198-0858
PO BOX 28859, SAN DIEGO, CA 92198-0859
PO BOX 28860, SAN DIEGO, CA 92198-0860
PO BOX 28861, SAN DIEGO, CA 92198-0861
PO BOX 28862, SAN DIEGO, CA 92198-0862
PO BOX 28863, SAN DIEGO, CA 92198-0863
PO BOX 28864, SAN DIEGO, CA 92198-0864
PO BOX 28865, SAN DIEGO, CA 92198-0865
PO BOX 28866, SAN DIEGO, CA 92198-0866
PO BOX 28867, SAN DIEGO, CA 92198-0867
PO BOX 28868, SAN DIEGO, CA 92198-0868
PO BOX 28869, SAN DIEGO, CA 92198-0869
PO BOX 28870, SAN DIEGO, CA 92198-0870
PO BOX 28871, SAN DIEGO, CA 92198-0871
PO BOX 28872, SAN DIEGO, CA 92198-0872
PO BOX 28873, SAN DIEGO, CA 92198-0873
PO BOX 28874, SAN DIEGO, CA 92198-0874
PO BOX 28875, SAN DIEGO, CA 92198-0875
PO BOX 28876, SAN DIEGO, CA 92198-0876
PO BOX 28877, SAN DIEGO, CA 92198-0877
PO BOX 28878, SAN DIEGO, CA 92198-0878
PO BOX 28879, SAN DIEGO, CA 92198-0879
PO BOX 28880, SAN DIEGO, CA 92198-0880
PO BOX 28881, SAN DIEGO, CA 92198-0881
PO BOX 28882, SAN DIEGO, CA 92198-0882
PO BOX 28883, SAN DIEGO, CA 92198-0883
PO BOX 28884, SAN DIEGO, CA 92198-0884
PO BOX 28885, SAN DIEGO, CA 92198-0885
PO BOX 28886, SAN DIEGO, CA 92198-0886
PO BOX 28887, SAN DIEGO, CA 92198-0887
PO BOX 28888, SAN DIEGO, CA 92198-0888
PO BOX 28889, SAN DIEGO, CA 92198-0889
PO BOX 28890, SAN DIEGO, CA 92198-0890
PO BOX 28891, SAN DIEGO, CA 92198-0891
PO BOX 28892, SAN DIEGO, CA 92198-0892
PO BOX 28893, SAN DIEGO, CA 92198-0893
PO BOX 28894, SAN DIEGO, CA 92198-0894
PO BOX 28895, SAN DIEGO, CA 92198-0895
PO BOX 28896, SAN DIEGO, CA 92198-0896
PO BOX 28897, SAN DIEGO, CA 92198-0897
PO BOX 28898, SAN DIEGO, CA 92198-0898
PO BOX 28899, SAN DIEGO, CA 92198-0899
PO BOX 28900, SAN DIEGO, CA 92198-0900
PO BOX 28901, SAN DIEGO, CA 92198-0901
PO BOX 28902, SAN DIEGO, CA 92198-0902
PO BOX 28903, SAN DIEGO, CA 92198-0903
PO BOX 28904, SAN DIEGO, CA 92198-0904
PO BOX 28905, SAN DIEGO, CA 92198-0905
PO BOX 28906, SAN DIEGO, CA 92198-0906
PO BOX 28907, SAN DIEGO, CA 92198-0907
PO BOX 28908, SAN DIEGO, CA 92198-0908
PO BOX 28909, SAN DIEGO, CA 92198-0909
PO BOX 28910, SAN DIEGO, CA 92198-0910
PO BOX 28911, SAN DIEGO, CA 92198-0911
PO BOX 28912, SAN DIEGO, CA 92198-0912
PO BOX 28913, SAN DIEGO, CA 92198-0913
PO BOX 28914, SAN DIEGO, CA 92198-0914
PO BOX 28915, SAN DIEGO, CA 92198-0915
PO BOX 28916, SAN DIEGO, CA 92198-0916
PO BOX 28917, SAN DIEGO, CA 92198-0917
PO BOX 28918, SAN DIEGO, CA 92198-0918
PO BOX 28919, SAN DIEGO, CA 92198-0919
PO BOX 28920, SAN DIEGO, CA 92198-0920
PO BOX 28921, SAN DIEGO, CA 92198-0921
PO BOX 28922, SAN DIEGO, CA 92198-0922
PO BOX 28923, SAN DIEGO, CA 92198-0923
PO BOX 28924, SAN DIEGO, CA 92198-0924
PO BOX 28925, SAN DIEGO, CA 92198-0925
PO BOX 28926, SAN DIEGO, CA 92198-0926
PO BOX 28927, SAN DIEGO, CA 92198-0927
PO BOX 28928, SAN DIEGO, CA 92198-0928
PO BOX 28929, SAN DIEGO, CA 92198-0929
PO BOX 28930, SAN DIEGO, CA 92198-0930
PO BOX 28931, SAN DIEGO, CA 92198-0931
PO BOX 28932, SAN DIEGO, CA 92198-0932
PO BOX 28933, SAN DIEGO, CA 92198-0933
PO BOX 28934, SAN DIEGO, CA 92198-0934
PO BOX 28935, SAN DIEGO, CA 92198-0935
PO BOX 28936, SAN DIEGO, CA 92198-0936
PO BOX 28937, SAN DIEGO, CA 92198-0937
PO BOX 28938, SAN DIEGO, CA 92198-0938
PO BOX 28939, SAN DIEGO, CA 92198-0939
PO BOX 28940, SAN DIEGO, CA 92198-0940
PO BOX 28941, SAN DIEGO, CA 92198-0941
PO BOX 28942, SAN DIEGO, CA 92198-0942
PO BOX 28943, SAN DIEGO, CA 92198-0943
PO BOX 28944, SAN DIEGO, CA 92198-0944
PO BOX 28945, SAN DIEGO, CA 92198-0945
PO BOX 28946, SAN DIEGO, CA 92198-0946
PO BOX 28947, SAN DIEGO, CA 92198-0947
PO BOX 28948, SAN DIEGO, CA 92198-0948
PO BOX 28949, SAN DIEGO, CA 92198-0949
PO BOX 28950, SAN DIEGO, CA 92198-0950
PO BOX 28951, SAN DIEGO, CA 92198-0951
PO BOX 28952, SAN DIEGO, CA 92198-0952
PO BOX 28953, SAN DIEGO, CA 92198-0953
PO BOX 28954, SAN DIEGO, CA 92198-0954
PO BOX 28955, SAN DIEGO, CA 92198-0955
PO BOX 28956, SAN DIEGO, CA 92198-0956
PO BOX 28957, SAN DIEGO, CA 92198-0957
PO BOX 28958, SAN DIEGO, CA 92198-0958
PO BOX 28959, SAN DIEGO, CA 92198-0959
PO BOX 28960, SAN DIEGO, CA 92198-0960
PO BOX 28961, SAN DIEGO, CA 92198-0961
PO BOX 28962, SAN DIEGO, CA 92198-0962
PO BOX 28963, SAN DIEGO, CA 92198-0963
PO BOX 28964, SAN DIEGO, CA 92198-0964
PO BOX 28965, SAN DIEGO, CA 92198-0965
PO BOX 28966, SAN DIEGO, CA 92198-0966
PO BOX 28967, SAN DIEGO, CA 92198-0967
PO BOX 28968, SAN DIEGO, CA 92198-0968
PO BOX 28969, SAN DIEGO, CA 92198-0969
PO BOX 28970, SAN DIEGO, CA 92198-0970
PO BOX 28971, SAN DIEGO, CA 92198-0971
PO BOX 28972, SAN DIEGO, CA 92198-0972
PO BOX 28973, SAN DIEGO, CA 92198-0973
PO BOX 28974, SAN DIEGO, CA 92198-0974
PO BOX 28975, SAN DIEGO, CA 92198-0975
PO BOX 28976, SAN DIEGO, CA 92198-0976
PO BOX 28977, SAN DIEGO, CA 92198-0977
PO BOX 28978, SAN DIEGO, CA 92198-0978
PO BOX 28979, SAN DIEGO, CA 92198-0979
PO BOX 28980, SAN DIEGO, CA 92198-0980
PO BOX 28981, SAN DIEGO, CA 92198-0981
PO BOX 28982, SAN DIEGO, CA 92198-0982
PO BOX 28983, SAN DIEGO, CA 92198-0983
PO BOX 28984, SAN DIEGO, CA 92198-0984
PO BOX 28985, SAN DIEGO, CA 92198-0985
PO BOX 28986, SAN DIEGO, CA 92198-0986
PO BOX 28987, SAN DIEGO, CA 92198-0987
PO BOX 28988, SAN DIEGO, CA 92198-0988
PO BOX 28989, SAN DIEGO, CA 92198-0989
PO BOX 28990, SAN DIEGO, CA 92198-0990
PO BOX 28991, SAN DIEGO, CA 92198-0991
PO BOX 28992, SAN DIEGO, CA 92198-0992
PO BOX 28993, SAN DIEGO, CA 92198-0993
PO BOX 28994, SAN DIEGO, CA 92198-0994
PO BOX 28995, SAN DIEGO, CA 92198-0995
PO BOX 28996, SAN DIEGO, CA 92198-0996
PO BOX 28997, SAN DIEGO, CA 92198-0997
PO BOX 28998, SAN DIEGO, CA 92198-0998
PO BOX 28999, SAN DIEGO, CA 92198-0999
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