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 891, PALO ALTO, CA 94302-0891
PO BOX 892, PALO ALTO, CA 94302-0892
PO BOX 893, PALO ALTO, CA 94302-0893
PO BOX 894, PALO ALTO, CA 94302-0894
PO BOX 895, PALO ALTO, CA 94302-0895
PO BOX 896, PALO ALTO, CA 94302-0896
PO BOX 897, PALO ALTO, CA 94302-0897
PO BOX 898, PALO ALTO, CA 94302-0898
PO BOX 899, PALO ALTO, CA 94302-0899
PO BOX 900, PALO ALTO, CA 94302-0900
PO BOX 901, PALO ALTO, CA 94302-0901
PO BOX 902, PALO ALTO, CA 94302-0902
PO BOX 903, PALO ALTO, CA 94302-0903
PO BOX 904, PALO ALTO, CA 94302-0904
PO BOX 905, PALO ALTO, CA 94302-0905
PO BOX 906, PALO ALTO, CA 94302-0906
PO BOX 907, PALO ALTO, CA 94302-0907
PO BOX 908, PALO ALTO, CA 94302-0908
PO BOX 909, PALO ALTO, CA 94302-0909
PO BOX 910, PALO ALTO, CA 94302-0910
PO BOX 911, PALO ALTO, CA 94302-0911
PO BOX 912, PALO ALTO, CA 94302-0912
PO BOX 913, PALO ALTO, CA 94302-0913
PO BOX 914, PALO ALTO, CA 94302-0914
PO BOX 915, PALO ALTO, CA 94302-0915
PO BOX 916, PALO ALTO, CA 94302-0916
PO BOX 917, PALO ALTO, CA 94302-0917
PO BOX 918, PALO ALTO, CA 94302-0918
PO BOX 919, PALO ALTO, CA 94302-0919
PO BOX 920, PALO ALTO, CA 94302-0920
PO BOX 921, PALO ALTO, CA 94302-0921
PO BOX 922, PALO ALTO, CA 94302-0922
PO BOX 923, PALO ALTO, CA 94302-0923
PO BOX 924, PALO ALTO, CA 94302-0924
PO BOX 925, PALO ALTO, CA 94302-0925
PO BOX 926, PALO ALTO, CA 94302-0926
PO BOX 927, PALO ALTO, CA 94302-0927
PO BOX 928, PALO ALTO, CA 94302-0928
PO BOX 929, PALO ALTO, CA 94302-0929
PO BOX 930, PALO ALTO, CA 94302-0930
PO BOX 931, PALO ALTO, CA 94302-0931
PO BOX 932, PALO ALTO, CA 94302-0932
PO BOX 933, PALO ALTO, CA 94302-0933
PO BOX 934, PALO ALTO, CA 94302-0934
PO BOX 935, PALO ALTO, CA 94302-0935
PO BOX 936, PALO ALTO, CA 94302-0936
PO BOX 937, PALO ALTO, CA 94302-0937
PO BOX 938, PALO ALTO, CA 94302-0938
PO BOX 939, PALO ALTO, CA 94302-0939
PO BOX 940, PALO ALTO, CA 94302-0940
PO BOX 941, PALO ALTO, CA 94302-0941
PO BOX 942, PALO ALTO, CA 94302-0942
PO BOX 943, PALO ALTO, CA 94302-0943
PO BOX 944, PALO ALTO, CA 94302-0944
PO BOX 945, PALO ALTO, CA 94302-0945
PO BOX 946, PALO ALTO, CA 94302-0946
PO BOX 947, PALO ALTO, CA 94302-0947
PO BOX 948, PALO ALTO, CA 94302-0948
PO BOX 949, PALO ALTO, CA 94302-0949
PO BOX 950, PALO ALTO, CA 94302-0950
PO BOX 951, PALO ALTO, CA 94302-0951
PO BOX 952, PALO ALTO, CA 94302-0952
PO BOX 953, PALO ALTO, CA 94302-0953
PO BOX 954, PALO ALTO, CA 94302-0954
PO BOX 955, PALO ALTO, CA 94302-0955
PO BOX 956, PALO ALTO, CA 94302-0956
PO BOX 957, PALO ALTO, CA 94302-0957
PO BOX 958, PALO ALTO, CA 94302-0958
PO BOX 959, PALO ALTO, CA 94302-0959
PO BOX 960, PALO ALTO, CA 94302-0960
PO BOX 961, PALO ALTO, CA 94302-0961
PO BOX 962, PALO ALTO, CA 94302-0962
PO BOX 963, PALO ALTO, CA 94302-0963
PO BOX 964, PALO ALTO, CA 94302-0964
PO BOX 965, PALO ALTO, CA 94302-0965
PO BOX 966, PALO ALTO, CA 94302-0966
PO BOX 967, PALO ALTO, CA 94302-0967
PO BOX 968, PALO ALTO, CA 94302-0968
PO BOX 969, PALO ALTO, CA 94302-0969
PO BOX 970, PALO ALTO, CA 94302-0970
PO BOX 971, PALO ALTO, CA 94302-0971
PO BOX 972, PALO ALTO, CA 94302-0972
PO BOX 973, PALO ALTO, CA 94302-0973
PO BOX 974, PALO ALTO, CA 94302-0974
PO BOX 975, PALO ALTO, CA 94302-0975
PO BOX 976, PALO ALTO, CA 94302-0976
PO BOX 977, PALO ALTO, CA 94302-0977
PO BOX 978, PALO ALTO, CA 94302-0978
PO BOX 979, PALO ALTO, CA 94302-0979
PO BOX 980, PALO ALTO, CA 94302-0980
PO BOX 981, PALO ALTO, CA 94302-0981
PO BOX 982, PALO ALTO, CA 94302-0982
PO BOX 983, PALO ALTO, CA 94302-0983
PO BOX 984, PALO ALTO, CA 94302-0984
PO BOX 985, PALO ALTO, CA 94302-0985
PO BOX 986, PALO ALTO, CA 94302-0986
PO BOX 987, PALO ALTO, CA 94302-0987
PO BOX 988, PALO ALTO, CA 94302-0988
PO BOX 989, PALO ALTO, CA 94302-0989
PO BOX 990, PALO ALTO, CA 94302-0990
PO BOX 991, PALO ALTO, CA 94302-0991
PO BOX 992, PALO ALTO, CA 94302-0992
PO BOX 993, PALO ALTO, CA 94302-0993
PO BOX 994, PALO ALTO, CA 94302-0994
PO BOX 995, PALO ALTO, CA 94302-0995
PO BOX 996, PALO ALTO, CA 94302-0996
PO BOX 997, PALO ALTO, CA 94302-0997
PO BOX 998, PALO ALTO, CA 94302-0998
PO BOX 999, PALO ALTO, CA 94302-0999
PO BOX 1000, PALO ALTO, CA 94302-1000
PO BOX 1001, PALO ALTO, CA 94302-1001
PO BOX 1002, PALO ALTO, CA 94302-1002
PO BOX 1003, PALO ALTO, CA 94302-1003
PO BOX 1004, PALO ALTO, CA 94302-1004
PO BOX 1005, PALO ALTO, CA 94302-1005
PO BOX 1006, PALO ALTO, CA 94302-1006
PO BOX 1007, PALO ALTO, CA 94302-1007
PO BOX 1008, PALO ALTO, CA 94302-1008
PO BOX 1009, PALO ALTO, CA 94302-1009
PO BOX 1010, PALO ALTO, CA 94302-1010
PO BOX 1011, PALO ALTO, CA 94302-1011
PO BOX 1012, PALO ALTO, CA 94302-1012
PO BOX 1013, PALO ALTO, CA 94302-1013
PO BOX 1014, PALO ALTO, CA 94302-1014
PO BOX 1015, PALO ALTO, CA 94302-1015
PO BOX 1016, PALO ALTO, CA 94302-1016
PO BOX 1017, PALO ALTO, CA 94302-1017
PO BOX 1018, PALO ALTO, CA 94302-1018
PO BOX 1019, PALO ALTO, CA 94302-1019
PO BOX 1020, PALO ALTO, CA 94302-1020
PO BOX 1021, PALO ALTO, CA 94302-1021
PO BOX 1022, PALO ALTO, CA 94302-1022
PO BOX 1023, PALO ALTO, CA 94302-1023
PO BOX 1024, PALO ALTO, CA 94302-1024
PO BOX 1025, PALO ALTO, CA 94302-1025
PO BOX 1026, PALO ALTO, CA 94302-1026
PO BOX 1027, PALO ALTO, CA 94302-1027
PO BOX 1028, PALO ALTO, CA 94302-1028
PO BOX 1029, PALO ALTO, CA 94302-1029
PO BOX 1030, PALO ALTO, CA 94302-1030
PO BOX 1031, PALO ALTO, CA 94302-1031
PO BOX 1032, PALO ALTO, CA 94302-1032
PO BOX 1033, PALO ALTO, CA 94302-1033
PO BOX 1034, PALO ALTO, CA 94302-1034
PO BOX 1035, PALO ALTO, CA 94302-1035
PO BOX 1036, PALO ALTO, CA 94302-1036
PO BOX 1037, PALO ALTO, CA 94302-1037
PO BOX 1038, PALO ALTO, CA 94302-1038
PO BOX 1039, PALO ALTO, CA 94302-1039
PO BOX 1040, PALO ALTO, CA 94302-1040
PO BOX 1041, PALO ALTO, CA 94302-1041
PO BOX 1042, PALO ALTO, CA 94302-1042
PO BOX 1043, PALO ALTO, CA 94302-1043
PO BOX 1044, PALO ALTO, CA 94302-1044
PO BOX 1045, PALO ALTO, CA 94302-1045
PO BOX 1046, PALO ALTO, CA 94302-1046
PO BOX 1047, PALO ALTO, CA 94302-1047
PO BOX 1048, PALO ALTO, CA 94302-1048
PO BOX 1049, PALO ALTO, CA 94302-1049
PO BOX 1050, PALO ALTO, CA 94302-1050
PO BOX 1051, PALO ALTO, CA 94302-1051
PO BOX 1052, PALO ALTO, CA 94302-1052
PO BOX 1053, PALO ALTO, CA 94302-1053
PO BOX 1054, PALO ALTO, CA 94302-1054
PO BOX 1055, PALO ALTO, CA 94302-1055
PO BOX 1056, PALO ALTO, CA 94302-1056
PO BOX 1057, PALO ALTO, CA 94302-1057
PO BOX 1058, PALO ALTO, CA 94302-1058
PO BOX 1059, PALO ALTO, CA 94302-1059
PO BOX 1060, PALO ALTO, CA 94302-1060
PO BOX 1061, PALO ALTO, CA 94302-1061
PO BOX 1062, PALO ALTO, CA 94302-1062
PO BOX 1063, PALO ALTO, CA 94302-1063
PO BOX 1064, PALO ALTO, CA 94302-1064
PO BOX 1065, PALO ALTO, CA 94302-1065
PO BOX 1066, PALO ALTO, CA 94302-1066
PO BOX 1067, PALO ALTO, CA 94302-1067
PO BOX 1068, PALO ALTO, CA 94302-1068
PO BOX 1069, PALO ALTO, CA 94302-1069
PO BOX 1070, PALO ALTO, CA 94302-1070
PO BOX 1071, PALO ALTO, CA 94302-1071
PO BOX 1072, PALO ALTO, CA 94302-1072
PO BOX 1073, PALO ALTO, CA 94302-1073
PO BOX 1074, PALO ALTO, CA 94302-1074
PO BOX 1075, PALO ALTO, CA 94302-1075
PO BOX 1076, PALO ALTO, CA 94302-1076
PO BOX 1077, PALO ALTO, CA 94302-1077
PO BOX 1078, PALO ALTO, CA 94302-1078
PO BOX 1079, PALO ALTO, CA 94302-1079
PO BOX 1080, PALO ALTO, CA 94302-1080
PO BOX 1081, PALO ALTO, CA 94302-1081
PO BOX 1082, PALO ALTO, CA 94302-1082
PO BOX 1083, PALO ALTO, CA 94302-1083
PO BOX 1084, PALO ALTO, CA 94302-1084
PO BOX 1085, PALO ALTO, CA 94302-1085
PO BOX 1086, PALO ALTO, CA 94302-1086
PO BOX 1087, PALO ALTO, CA 94302-1087
PO BOX 1088, PALO ALTO, CA 94302-1088
PO BOX 1089, PALO ALTO, CA 94302-1089
PO BOX 1090, PALO ALTO, CA 94302-1090
PO BOX 1091, PALO ALTO, CA 94302-1091
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