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 841, PASADENA, CA 91102-0841
PO BOX 842, PASADENA, CA 91102-0842
PO BOX 843, PASADENA, CA 91102-0843
PO BOX 844, PASADENA, CA 91102-0844
PO BOX 845, PASADENA, CA 91102-0845
PO BOX 846, PASADENA, CA 91102-0846
PO BOX 847, PASADENA, CA 91102-0847
PO BOX 848, PASADENA, CA 91102-0848
PO BOX 849, PASADENA, CA 91102-0849
PO BOX 850, PASADENA, CA 91102-0850
PO BOX 851, PASADENA, CA 91102-0851
PO BOX 852, PASADENA, CA 91102-0852
PO BOX 853, PASADENA, CA 91102-0853
PO BOX 854, PASADENA, CA 91102-0854
PO BOX 855, PASADENA, CA 91102-0855
PO BOX 856, PASADENA, CA 91102-0856
PO BOX 857, PASADENA, CA 91102-0857
PO BOX 858, PASADENA, CA 91102-0858
PO BOX 859, PASADENA, CA 91102-0859
PO BOX 860, PASADENA, CA 91102-0860
PO BOX 861, PASADENA, CA 91102-0861
PO BOX 862, PASADENA, CA 91102-0862
PO BOX 863, PASADENA, CA 91102-0863
PO BOX 864, PASADENA, CA 91102-0864
PO BOX 865, PASADENA, CA 91102-0865
PO BOX 866, PASADENA, CA 91102-0866
PO BOX 867, PASADENA, CA 91102-0867
PO BOX 868, PASADENA, CA 91102-0868
PO BOX 869, PASADENA, CA 91102-0869
PO BOX 870, PASADENA, CA 91102-0870
PO BOX 871, PASADENA, CA 91102-0871
PO BOX 872, PASADENA, CA 91102-0872
PO BOX 873, PASADENA, CA 91102-0873
PO BOX 874, PASADENA, CA 91102-0874
PO BOX 875, PASADENA, CA 91102-0875
PO BOX 876, PASADENA, CA 91102-0876
PO BOX 877, PASADENA, CA 91102-0877
PO BOX 878, PASADENA, CA 91102-0878
PO BOX 879, PASADENA, CA 91102-0879
PO BOX 880, PASADENA, CA 91102-0880
PO BOX 881, PASADENA, CA 91102-0881
PO BOX 882, PASADENA, CA 91102-0882
PO BOX 883, PASADENA, CA 91102-0883
PO BOX 884, PASADENA, CA 91102-0884
PO BOX 885, PASADENA, CA 91102-0885
PO BOX 886, PASADENA, CA 91102-0886
PO BOX 887, PASADENA, CA 91102-0887
PO BOX 888, PASADENA, CA 91102-0888
PO BOX 889, PASADENA, CA 91102-0889
PO BOX 890, PASADENA, CA 91102-0890
PO BOX 891, PASADENA, CA 91102-0891
PO BOX 892, PASADENA, CA 91102-0892
PO BOX 893, PASADENA, CA 91102-0893
PO BOX 894, PASADENA, CA 91102-0894
PO BOX 895, PASADENA, CA 91102-0895
PO BOX 896, PASADENA, CA 91102-0896
PO BOX 897, PASADENA, CA 91102-0897
PO BOX 898, PASADENA, CA 91102-0898
PO BOX 899, PASADENA, CA 91102-0899
PO BOX 900, PASADENA, CA 91102-0900
PO BOX 901, PASADENA, CA 91102-0901
PO BOX 902, PASADENA, CA 91102-0902
PO BOX 903, PASADENA, CA 91102-0903
PO BOX 904, PASADENA, CA 91102-0904
PO BOX 905, PASADENA, CA 91102-0905
PO BOX 906, PASADENA, CA 91102-0906
PO BOX 907, PASADENA, CA 91102-0907
PO BOX 908, PASADENA, CA 91102-0908
PO BOX 909, PASADENA, CA 91102-0909
PO BOX 910, PASADENA, CA 91102-0910
PO BOX 911, PASADENA, CA 91102-0911
PO BOX 912, PASADENA, CA 91102-0912
PO BOX 913, PASADENA, CA 91102-0913
PO BOX 914, PASADENA, CA 91102-0914
PO BOX 915, PASADENA, CA 91102-0915
PO BOX 916, PASADENA, CA 91102-0916
PO BOX 917, PASADENA, CA 91102-0917
PO BOX 918, PASADENA, CA 91102-0918
PO BOX 919, PASADENA, CA 91102-0919
PO BOX 920, PASADENA, CA 91102-0920
PO BOX 921, PASADENA, CA 91102-0921
PO BOX 922, PASADENA, CA 91102-0922
PO BOX 923, PASADENA, CA 91102-0923
PO BOX 924, PASADENA, CA 91102-0924
PO BOX 925, PASADENA, CA 91102-0925
PO BOX 926, PASADENA, CA 91102-0926
PO BOX 927, PASADENA, CA 91102-0927
PO BOX 928, PASADENA, CA 91102-0928
PO BOX 929, PASADENA, CA 91102-0929
PO BOX 930, PASADENA, CA 91102-0930
PO BOX 931, PASADENA, CA 91102-0931
PO BOX 932, PASADENA, CA 91102-0932
PO BOX 933, PASADENA, CA 91102-0933
PO BOX 934, PASADENA, CA 91102-0934
PO BOX 935, PASADENA, CA 91102-0935
PO BOX 936, PASADENA, CA 91102-0936
PO BOX 937, PASADENA, CA 91102-0937
PO BOX 938, PASADENA, CA 91102-0938
PO BOX 939, PASADENA, CA 91102-0939
PO BOX 940, PASADENA, CA 91102-0940
PO BOX 941, PASADENA, CA 91102-0941
PO BOX 942, PASADENA, CA 91102-0942
PO BOX 943, PASADENA, CA 91102-0943
PO BOX 944, PASADENA, CA 91102-0944
PO BOX 945, PASADENA, CA 91102-0945
PO BOX 946, PASADENA, CA 91102-0946
PO BOX 947, PASADENA, CA 91102-0947
PO BOX 948, PASADENA, CA 91102-0948
PO BOX 949, PASADENA, CA 91102-0949
PO BOX 950, PASADENA, CA 91102-0950
PO BOX 951, PASADENA, CA 91102-0951
PO BOX 952, PASADENA, CA 91102-0952
PO BOX 953, PASADENA, CA 91102-0953
PO BOX 954, PASADENA, CA 91102-0954
PO BOX 955, PASADENA, CA 91102-0955
PO BOX 956, PASADENA, CA 91102-0956
PO BOX 957, PASADENA, CA 91102-0957
PO BOX 958, PASADENA, CA 91102-0958
PO BOX 959, PASADENA, CA 91102-0959
PO BOX 960, PASADENA, CA 91102-0960
PO BOX 961, PASADENA, CA 91102-0961
PO BOX 962, PASADENA, CA 91102-0962
PO BOX 963, PASADENA, CA 91102-0963
PO BOX 964, PASADENA, CA 91102-0964
PO BOX 965, PASADENA, CA 91102-0965
PO BOX 966, PASADENA, CA 91102-0966
PO BOX 967, PASADENA, CA 91102-0967
PO BOX 968, PASADENA, CA 91102-0968
PO BOX 969, PASADENA, CA 91102-0969
PO BOX 970, PASADENA, CA 91102-0970
PO BOX 971, PASADENA, CA 91102-0971
PO BOX 972, PASADENA, CA 91102-0972
PO BOX 973, PASADENA, CA 91102-0973
PO BOX 974, PASADENA, CA 91102-0974
PO BOX 975, PASADENA, CA 91102-0975
PO BOX 976, PASADENA, CA 91102-0976
PO BOX 977, PASADENA, CA 91102-0977
PO BOX 978, PASADENA, CA 91102-0978
PO BOX 979, PASADENA, CA 91102-0979
PO BOX 980, PASADENA, CA 91102-0980
PO BOX 981, PASADENA, CA 91102-0981
PO BOX 982, PASADENA, CA 91102-0982
PO BOX 983, PASADENA, CA 91102-0983
PO BOX 984, PASADENA, CA 91102-0984
PO BOX 985, PASADENA, CA 91102-0985
PO BOX 986, PASADENA, CA 91102-0986
PO BOX 987, PASADENA, CA 91102-0987
PO BOX 988, PASADENA, CA 91102-0988
PO BOX 989, PASADENA, CA 91102-0989
PO BOX 990, PASADENA, CA 91102-0990
PO BOX 991, PASADENA, CA 91102-0991
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