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 120841, SAN DIEGO, CA 92112-0841
PO BOX 120842, SAN DIEGO, CA 92112-0842
PO BOX 120843, SAN DIEGO, CA 92112-0843
PO BOX 120844, SAN DIEGO, CA 92112-0844
PO BOX 120845, SAN DIEGO, CA 92112-0845
PO BOX 120846, SAN DIEGO, CA 92112-0846
PO BOX 120847, SAN DIEGO, CA 92112-0847
PO BOX 120848, SAN DIEGO, CA 92112-0848
PO BOX 120849, SAN DIEGO, CA 92112-0849
PO BOX 120850, SAN DIEGO, CA 92112-0850
PO BOX 120851, SAN DIEGO, CA 92112-0851
PO BOX 120852, SAN DIEGO, CA 92112-0852
PO BOX 120853, SAN DIEGO, CA 92112-0853
PO BOX 120854, SAN DIEGO, CA 92112-0854
PO BOX 120855, SAN DIEGO, CA 92112-0855
PO BOX 120856, SAN DIEGO, CA 92112-0856
PO BOX 120857, SAN DIEGO, CA 92112-0857
PO BOX 120858, SAN DIEGO, CA 92112-0858
PO BOX 120859, SAN DIEGO, CA 92112-0859
PO BOX 120860, SAN DIEGO, CA 92112-0860
PO BOX 120861, SAN DIEGO, CA 92112-0861
PO BOX 120862, SAN DIEGO, CA 92112-0862
PO BOX 120863, SAN DIEGO, CA 92112-0863
PO BOX 120864, SAN DIEGO, CA 92112-0864
PO BOX 120865, SAN DIEGO, CA 92112-0865
PO BOX 120866, SAN DIEGO, CA 92112-0866
PO BOX 120867, SAN DIEGO, CA 92112-0867
PO BOX 120868, SAN DIEGO, CA 92112-0868
PO BOX 120869, SAN DIEGO, CA 92112-0869
PO BOX 120870, SAN DIEGO, CA 92112-0870
PO BOX 120871, SAN DIEGO, CA 92112-0871
PO BOX 120872, SAN DIEGO, CA 92112-0872
PO BOX 120873, SAN DIEGO, CA 92112-0873
PO BOX 120874, SAN DIEGO, CA 92112-0874
PO BOX 120875, SAN DIEGO, CA 92112-0875
PO BOX 120876, SAN DIEGO, CA 92112-0876
PO BOX 120877, SAN DIEGO, CA 92112-0877
PO BOX 120878, SAN DIEGO, CA 92112-0878
PO BOX 120879, SAN DIEGO, CA 92112-0879
PO BOX 120880, SAN DIEGO, CA 92112-0880
PO BOX 120881, SAN DIEGO, CA 92112-0881
PO BOX 120882, SAN DIEGO, CA 92112-0882
PO BOX 120883, SAN DIEGO, CA 92112-0883
PO BOX 120884, SAN DIEGO, CA 92112-0884
PO BOX 120885, SAN DIEGO, CA 92112-0885
PO BOX 120886, SAN DIEGO, CA 92112-0886
PO BOX 120887, SAN DIEGO, CA 92112-0887
PO BOX 120888, SAN DIEGO, CA 92112-0888
PO BOX 120889, SAN DIEGO, CA 92112-0889
PO BOX 120890, SAN DIEGO, CA 92112-0890
PO BOX 120891, SAN DIEGO, CA 92112-0891
PO BOX 120892, SAN DIEGO, CA 92112-0892
PO BOX 120893, SAN DIEGO, CA 92112-0893
PO BOX 120894, SAN DIEGO, CA 92112-0894
PO BOX 120895, SAN DIEGO, CA 92112-0895
PO BOX 120896, SAN DIEGO, CA 92112-0896
PO BOX 120897, SAN DIEGO, CA 92112-0897
PO BOX 120898, SAN DIEGO, CA 92112-0898
PO BOX 120899, SAN DIEGO, CA 92112-0899
PO BOX 120900, SAN DIEGO, CA 92112-0900
PO BOX 120901, SAN DIEGO, CA 92112-0901
PO BOX 120902, SAN DIEGO, CA 92112-0902
PO BOX 120903, SAN DIEGO, CA 92112-0903
PO BOX 120904, SAN DIEGO, CA 92112-0904
PO BOX 120905, SAN DIEGO, CA 92112-0905
PO BOX 120906, SAN DIEGO, CA 92112-0906
PO BOX 120907, SAN DIEGO, CA 92112-0907
PO BOX 120908, SAN DIEGO, CA 92112-0908
PO BOX 120909, SAN DIEGO, CA 92112-0909
PO BOX 120910, SAN DIEGO, CA 92112-0910
PO BOX 120911, SAN DIEGO, CA 92112-0911
PO BOX 120912, SAN DIEGO, CA 92112-0912
PO BOX 120913, SAN DIEGO, CA 92112-0913
PO BOX 120914, SAN DIEGO, CA 92112-0914
PO BOX 120915, SAN DIEGO, CA 92112-0915
PO BOX 120916, SAN DIEGO, CA 92112-0916
PO BOX 120917, SAN DIEGO, CA 92112-0917
PO BOX 120918, SAN DIEGO, CA 92112-0918
PO BOX 120919, SAN DIEGO, CA 92112-0919
PO BOX 120920, SAN DIEGO, CA 92112-0920
PO BOX 120921, SAN DIEGO, CA 92112-0921
PO BOX 120922, SAN DIEGO, CA 92112-0922
PO BOX 120923, SAN DIEGO, CA 92112-0923
PO BOX 120924, SAN DIEGO, CA 92112-0924
PO BOX 120925, SAN DIEGO, CA 92112-0925
PO BOX 120926, SAN DIEGO, CA 92112-0926
PO BOX 120927, SAN DIEGO, CA 92112-0927
PO BOX 120928, SAN DIEGO, CA 92112-0928
PO BOX 120929, SAN DIEGO, CA 92112-0929
PO BOX 120930, SAN DIEGO, CA 92112-0930
PO BOX 120931, SAN DIEGO, CA 92112-0931
PO BOX 120932, SAN DIEGO, CA 92112-0932
PO BOX 120933, SAN DIEGO, CA 92112-0933
PO BOX 120934, SAN DIEGO, CA 92112-0934
PO BOX 120935, SAN DIEGO, CA 92112-0935
PO BOX 120936, SAN DIEGO, CA 92112-0936
PO BOX 120937, SAN DIEGO, CA 92112-0937
PO BOX 120938, SAN DIEGO, CA 92112-0938
PO BOX 120939, SAN DIEGO, CA 92112-0939
PO BOX 120940, SAN DIEGO, CA 92112-0940
PO BOX 120941, SAN DIEGO, CA 92112-0941
PO BOX 120942, SAN DIEGO, CA 92112-0942
PO BOX 120943, SAN DIEGO, CA 92112-0943
PO BOX 120944, SAN DIEGO, CA 92112-0944
PO BOX 120945, SAN DIEGO, CA 92112-0945
PO BOX 120946, SAN DIEGO, CA 92112-0946
PO BOX 120947, SAN DIEGO, CA 92112-0947
PO BOX 120948, SAN DIEGO, CA 92112-0948
PO BOX 120949, SAN DIEGO, CA 92112-0949
PO BOX 120950, SAN DIEGO, CA 92112-0950
PO BOX 120951, SAN DIEGO, CA 92112-0951
PO BOX 120952, SAN DIEGO, CA 92112-0952
PO BOX 120953, SAN DIEGO, CA 92112-0953
PO BOX 120954, SAN DIEGO, CA 92112-0954
PO BOX 120955, SAN DIEGO, CA 92112-0955
PO BOX 120956, SAN DIEGO, CA 92112-0956
PO BOX 120957, SAN DIEGO, CA 92112-0957
PO BOX 120958, SAN DIEGO, CA 92112-0958
PO BOX 120959, SAN DIEGO, CA 92112-0959
PO BOX 120960, SAN DIEGO, CA 92112-0960
PO BOX 120961, SAN DIEGO, CA 92112-0961
PO BOX 120962, SAN DIEGO, CA 92112-0962
PO BOX 120963, SAN DIEGO, CA 92112-0963
PO BOX 120964, SAN DIEGO, CA 92112-0964
PO BOX 120965, SAN DIEGO, CA 92112-0965
PO BOX 120966, SAN DIEGO, CA 92112-0966
PO BOX 120967, SAN DIEGO, CA 92112-0967
PO BOX 120968, SAN DIEGO, CA 92112-0968
PO BOX 120969, SAN DIEGO, CA 92112-0969
PO BOX 120970, SAN DIEGO, CA 92112-0970
PO BOX 120971, SAN DIEGO, CA 92112-0971
PO BOX 120972, SAN DIEGO, CA 92112-0972
PO BOX 120973, SAN DIEGO, CA 92112-0973
PO BOX 120974, SAN DIEGO, CA 92112-0974
PO BOX 120975, SAN DIEGO, CA 92112-0975
PO BOX 120976, SAN DIEGO, CA 92112-0976
PO BOX 120977, SAN DIEGO, CA 92112-0977
PO BOX 120978, SAN DIEGO, CA 92112-0978
PO BOX 120979, SAN DIEGO, CA 92112-0979
PO BOX 120980, SAN DIEGO, CA 92112-0980
PO BOX 120981, SAN DIEGO, CA 92112-0981
PO BOX 120982, SAN DIEGO, CA 92112-0982
PO BOX 120983, SAN DIEGO, CA 92112-0983
PO BOX 120984, SAN DIEGO, CA 92112-0984
PO BOX 120985, SAN DIEGO, CA 92112-0985
PO BOX 120986, SAN DIEGO, CA 92112-0986
PO BOX 120987, SAN DIEGO, CA 92112-0987
PO BOX 120988, SAN DIEGO, CA 92112-0988
PO BOX 120989, SAN DIEGO, CA 92112-0989
PO BOX 120990, SAN DIEGO, CA 92112-0990
PO BOX 120991, SAN DIEGO, CA 92112-0991
PO BOX 120992, SAN DIEGO, CA 92112-0992
PO BOX 120993, SAN DIEGO, CA 92112-0993
PO BOX 120994, SAN DIEGO, CA 92112-0994
PO BOX 120995, SAN DIEGO, CA 92112-0995
PO BOX 120996, SAN DIEGO, CA 92112-0996
PO BOX 120997, SAN DIEGO, CA 92112-0997
PO BOX 120998, SAN DIEGO, CA 92112-0998
PO BOX 120999, SAN DIEGO, CA 92112-0999
PO BOX 121000, SAN DIEGO, CA 92112-1000
PO BOX 121001, SAN DIEGO, CA 92112-1001
PO BOX 121002, SAN DIEGO, CA 92112-1002
PO BOX 121003, SAN DIEGO, CA 92112-1003
PO BOX 121004, SAN DIEGO, CA 92112-1004
PO BOX 121005, SAN DIEGO, CA 92112-1005
PO BOX 121006, SAN DIEGO, CA 92112-1006
PO BOX 121007, SAN DIEGO, CA 92112-1007
PO BOX 121008, SAN DIEGO, CA 92112-1008
PO BOX 121009, SAN DIEGO, CA 92112-1009
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