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 881, PORTERVILLE, CA 93258-0881
PO BOX 882, PORTERVILLE, CA 93258-0882
PO BOX 883, PORTERVILLE, CA 93258-0883
PO BOX 884, PORTERVILLE, CA 93258-0884
PO BOX 885, PORTERVILLE, CA 93258-0885
PO BOX 886, PORTERVILLE, CA 93258-0886
PO BOX 887, PORTERVILLE, CA 93258-0887
PO BOX 888, PORTERVILLE, CA 93258-0888
PO BOX 889, PORTERVILLE, CA 93258-0889
PO BOX 890, PORTERVILLE, CA 93258-0890
PO BOX 891, PORTERVILLE, CA 93258-0891
PO BOX 892, PORTERVILLE, CA 93258-0892
PO BOX 893, PORTERVILLE, CA 93258-0893
PO BOX 894, PORTERVILLE, CA 93258-0894
PO BOX 895, PORTERVILLE, CA 93258-0895
PO BOX 896, PORTERVILLE, CA 93258-0896
PO BOX 897, PORTERVILLE, CA 93258-0897
PO BOX 898, PORTERVILLE, CA 93258-0898
PO BOX 899, PORTERVILLE, CA 93258-0899
PO BOX 900, PORTERVILLE, CA 93258-0900
PO BOX 901, PORTERVILLE, CA 93258-0901
PO BOX 902, PORTERVILLE, CA 93258-0902
PO BOX 903, PORTERVILLE, CA 93258-0903
PO BOX 904, PORTERVILLE, CA 93258-0904
PO BOX 905, PORTERVILLE, CA 93258-0905
PO BOX 906, PORTERVILLE, CA 93258-0906
PO BOX 907, PORTERVILLE, CA 93258-0907
PO BOX 908, PORTERVILLE, CA 93258-0908
PO BOX 909, PORTERVILLE, CA 93258-0909
PO BOX 910, PORTERVILLE, CA 93258-0910
PO BOX 911, PORTERVILLE, CA 93258-0911
PO BOX 912, PORTERVILLE, CA 93258-0912
PO BOX 913, PORTERVILLE, CA 93258-0913
PO BOX 914, PORTERVILLE, CA 93258-0914
PO BOX 915, PORTERVILLE, CA 93258-0915
PO BOX 916, PORTERVILLE, CA 93258-0916
PO BOX 917, PORTERVILLE, CA 93258-0917
PO BOX 918, PORTERVILLE, CA 93258-0918
PO BOX 919, PORTERVILLE, CA 93258-0919
PO BOX 920, PORTERVILLE, CA 93258-0920
PO BOX 921, PORTERVILLE, CA 93258-0921
PO BOX 922, PORTERVILLE, CA 93258-0922
PO BOX 923, PORTERVILLE, CA 93258-0923
PO BOX 924, PORTERVILLE, CA 93258-0924
PO BOX 925, PORTERVILLE, CA 93258-0925
PO BOX 926, PORTERVILLE, CA 93258-0926
PO BOX 927, PORTERVILLE, CA 93258-0927
PO BOX 928, PORTERVILLE, CA 93258-0928
PO BOX 929, PORTERVILLE, CA 93258-0929
PO BOX 930, PORTERVILLE, CA 93258-0930
PO BOX 931, PORTERVILLE, CA 93258-0931
PO BOX 932, PORTERVILLE, CA 93258-0932
PO BOX 933, PORTERVILLE, CA 93258-0933
PO BOX 934, PORTERVILLE, CA 93258-0934
PO BOX 935, PORTERVILLE, CA 93258-0935
PO BOX 936, PORTERVILLE, CA 93258-0936
PO BOX 937, PORTERVILLE, CA 93258-0937
PO BOX 938, PORTERVILLE, CA 93258-0938
PO BOX 939, PORTERVILLE, CA 93258-0939
PO BOX 940, PORTERVILLE, CA 93258-0940
PO BOX 941, PORTERVILLE, CA 93258-0941
PO BOX 942, PORTERVILLE, CA 93258-0942
PO BOX 943, PORTERVILLE, CA 93258-0943
PO BOX 944, PORTERVILLE, CA 93258-0944
PO BOX 945, PORTERVILLE, CA 93258-0945
PO BOX 946, PORTERVILLE, CA 93258-0946
PO BOX 947, PORTERVILLE, CA 93258-0947
PO BOX 948, PORTERVILLE, CA 93258-0948
PO BOX 949, PORTERVILLE, CA 93258-0949
PO BOX 950, PORTERVILLE, CA 93258-0950
PO BOX 951, PORTERVILLE, CA 93258-0951
PO BOX 952, PORTERVILLE, CA 93258-0952
PO BOX 953, PORTERVILLE, CA 93258-0953
PO BOX 954, PORTERVILLE, CA 93258-0954
PO BOX 955, PORTERVILLE, CA 93258-0955
PO BOX 956, PORTERVILLE, CA 93258-0956
PO BOX 957, PORTERVILLE, CA 93258-0957
PO BOX 958, PORTERVILLE, CA 93258-0958
PO BOX 959, PORTERVILLE, CA 93258-0959
PO BOX 960, PORTERVILLE, CA 93258-0960
PO BOX 961, PORTERVILLE, CA 93258-0961
PO BOX 962, PORTERVILLE, CA 93258-0962
PO BOX 963, PORTERVILLE, CA 93258-0963
PO BOX 964, PORTERVILLE, CA 93258-0964
PO BOX 965, PORTERVILLE, CA 93258-0965
PO BOX 966, PORTERVILLE, CA 93258-0966
PO BOX 967, PORTERVILLE, CA 93258-0967
PO BOX 968, PORTERVILLE, CA 93258-0968
PO BOX 969, PORTERVILLE, CA 93258-0969
PO BOX 970, PORTERVILLE, CA 93258-0970
PO BOX 971, PORTERVILLE, CA 93258-0971
PO BOX 972, PORTERVILLE, CA 93258-0972
PO BOX 973, PORTERVILLE, CA 93258-0973
PO BOX 974, PORTERVILLE, CA 93258-0974
PO BOX 975, PORTERVILLE, CA 93258-0975
PO BOX 976, PORTERVILLE, CA 93258-0976
PO BOX 977, PORTERVILLE, CA 93258-0977
PO BOX 978, PORTERVILLE, CA 93258-0978
PO BOX 979, PORTERVILLE, CA 93258-0979
PO BOX 980, PORTERVILLE, CA 93258-0980
PO BOX 981, PORTERVILLE, CA 93258-0981
PO BOX 982, PORTERVILLE, CA 93258-0982
PO BOX 983, PORTERVILLE, CA 93258-0983
PO BOX 984, PORTERVILLE, CA 93258-0984
PO BOX 985, PORTERVILLE, CA 93258-0985
PO BOX 986, PORTERVILLE, CA 93258-0986
PO BOX 987, PORTERVILLE, CA 93258-0987
PO BOX 988, PORTERVILLE, CA 93258-0988
PO BOX 989, PORTERVILLE, CA 93258-0989
PO BOX 990, PORTERVILLE, CA 93258-0990
PO BOX 991, PORTERVILLE, CA 93258-0991
PO BOX 992, PORTERVILLE, CA 93258-0992
PO BOX 993, PORTERVILLE, CA 93258-0993
PO BOX 994, PORTERVILLE, CA 93258-0994
PO BOX 995, PORTERVILLE, CA 93258-0995
PO BOX 996, PORTERVILLE, CA 93258-0996
PO BOX 997, PORTERVILLE, CA 93258-0997
PO BOX 998, PORTERVILLE, CA 93258-0998
PO BOX 999, PORTERVILLE, CA 93258-0999
PO BOX 1000, PORTERVILLE, CA 93258-1000
PO BOX 1001, PORTERVILLE, CA 93258-1001
PO BOX 1002, PORTERVILLE, CA 93258-1002
PO BOX 1003, PORTERVILLE, CA 93258-1003
PO BOX 1004, PORTERVILLE, CA 93258-1004
PO BOX 1005, PORTERVILLE, CA 93258-1005
PO BOX 1006, PORTERVILLE, CA 93258-1006
PO BOX 1007, PORTERVILLE, CA 93258-1007
PO BOX 1008, PORTERVILLE, CA 93258-1008
PO BOX 1009, PORTERVILLE, CA 93258-1009
PO BOX 1010, PORTERVILLE, CA 93258-1010
PO BOX 1011, PORTERVILLE, CA 93258-1011
PO BOX 1012, PORTERVILLE, CA 93258-1012
PO BOX 1013, PORTERVILLE, CA 93258-1013
PO BOX 1014, PORTERVILLE, CA 93258-1014
PO BOX 1015, PORTERVILLE, CA 93258-1015
PO BOX 1016, PORTERVILLE, CA 93258-1016
PO BOX 1017, PORTERVILLE, CA 93258-1017
PO BOX 1018, PORTERVILLE, CA 93258-1018
PO BOX 1019, PORTERVILLE, CA 93258-1019
PO BOX 1020, PORTERVILLE, CA 93258-1020
PO BOX 1021, PORTERVILLE, CA 93258-1021
PO BOX 1022, PORTERVILLE, CA 93258-1022
PO BOX 1023, PORTERVILLE, CA 93258-1023
PO BOX 1024, PORTERVILLE, CA 93258-1024
PO BOX 1025, PORTERVILLE, CA 93258-1025
PO BOX 1026, PORTERVILLE, CA 93258-1026
PO BOX 1027, PORTERVILLE, CA 93258-1027
PO BOX 1028, PORTERVILLE, CA 93258-1028
PO BOX 1029, PORTERVILLE, CA 93258-1029
PO BOX 1030, PORTERVILLE, CA 93258-1030
PO BOX 1031, PORTERVILLE, CA 93258-1031
PO BOX 1032, PORTERVILLE, CA 93258-1032
PO BOX 1033, PORTERVILLE, CA 93258-1033
PO BOX 1034, PORTERVILLE, CA 93258-1034
PO BOX 1035, PORTERVILLE, CA 93258-1035
PO BOX 1036, PORTERVILLE, CA 93258-1036
PO BOX 1037, PORTERVILLE, CA 93258-1037
PO BOX 1038, PORTERVILLE, CA 93258-1038
PO BOX 1039, PORTERVILLE, CA 93258-1039
PO BOX 1040, PORTERVILLE, CA 93258-1040
PO BOX 1041, PORTERVILLE, CA 93258-1041
PO BOX 1042, PORTERVILLE, CA 93258-1042
PO BOX 1043, PORTERVILLE, CA 93258-1043
PO BOX 1044, PORTERVILLE, CA 93258-1044
PO BOX 1045, PORTERVILLE, CA 93258-1045
PO BOX 1046, PORTERVILLE, CA 93258-1046
PO BOX 1047, PORTERVILLE, CA 93258-1047
PO BOX 1048, PORTERVILLE, CA 93258-1048
PO BOX 1049, PORTERVILLE, CA 93258-1049
PO BOX 1050, PORTERVILLE, CA 93258-1050
PO BOX 1051, PORTERVILLE, CA 93258-1051
PO BOX 1052, PORTERVILLE, CA 93258-1052
PO BOX 1053, PORTERVILLE, CA 93258-1053
PO BOX 1054, PORTERVILLE, CA 93258-1054
PO BOX 1055, PORTERVILLE, CA 93258-1055
PO BOX 1056, PORTERVILLE, CA 93258-1056
PO BOX 1057, PORTERVILLE, CA 93258-1057
PO BOX 1058, PORTERVILLE, CA 93258-1058
PO BOX 1059, PORTERVILLE, CA 93258-1059
PO BOX 1060, PORTERVILLE, CA 93258-1060
PO BOX 1061, PORTERVILLE, CA 93258-1061
PO BOX 1062, PORTERVILLE, CA 93258-1062
PO BOX 1063, PORTERVILLE, CA 93258-1063
PO BOX 1064, PORTERVILLE, CA 93258-1064
PO BOX 1065, PORTERVILLE, CA 93258-1065
PO BOX 1066, PORTERVILLE, CA 93258-1066
PO BOX 1067, PORTERVILLE, CA 93258-1067
PO BOX 1068, PORTERVILLE, CA 93258-1068
PO BOX 1069, PORTERVILLE, CA 93258-1069
PO BOX 1070, PORTERVILLE, CA 93258-1070
PO BOX 1071, PORTERVILLE, CA 93258-1071
PO BOX 1072, PORTERVILLE, CA 93258-1072
PO BOX 1073, PORTERVILLE, CA 93258-1073
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