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 1001, SAN BERNARDINO, CA 92402-1001
PO BOX 1002, SAN BERNARDINO, CA 92402-1002
PO BOX 1003, SAN BERNARDINO, CA 92402-1003
PO BOX 1004, SAN BERNARDINO, CA 92402-1004
PO BOX 1005, SAN BERNARDINO, CA 92402-1005
PO BOX 1006, SAN BERNARDINO, CA 92402-1006
PO BOX 1007, SAN BERNARDINO, CA 92402-1007
PO BOX 1008, SAN BERNARDINO, CA 92402-1008
PO BOX 1009, SAN BERNARDINO, CA 92402-1009
PO BOX 1010, SAN BERNARDINO, CA 92402-1010
PO BOX 1011, SAN BERNARDINO, CA 92402-1011
PO BOX 1012, SAN BERNARDINO, CA 92402-1012
PO BOX 1013, SAN BERNARDINO, CA 92402-1013
PO BOX 1014, SAN BERNARDINO, CA 92402-1014
PO BOX 1015, SAN BERNARDINO, CA 92402-1015
PO BOX 1016, SAN BERNARDINO, CA 92402-1016
PO BOX 1017, SAN BERNARDINO, CA 92402-1017
PO BOX 1018, SAN BERNARDINO, CA 92402-1018
PO BOX 1019, SAN BERNARDINO, CA 92402-1019
PO BOX 1020, SAN BERNARDINO, CA 92402-1020
PO BOX 1021, SAN BERNARDINO, CA 92402-1021
PO BOX 1022, SAN BERNARDINO, CA 92402-1022
PO BOX 1023, SAN BERNARDINO, CA 92402-1023
PO BOX 1024, SAN BERNARDINO, CA 92402-1024
PO BOX 1025, SAN BERNARDINO, CA 92402-1025
PO BOX 1026, SAN BERNARDINO, CA 92402-1026
PO BOX 1027, SAN BERNARDINO, CA 92402-1027
PO BOX 1028, SAN BERNARDINO, CA 92402-1028
PO BOX 1029, SAN BERNARDINO, CA 92402-1029
PO BOX 1030, SAN BERNARDINO, CA 92402-1030
PO BOX 1031, SAN BERNARDINO, CA 92402-1031
PO BOX 1032, SAN BERNARDINO, CA 92402-1032
PO BOX 1033, SAN BERNARDINO, CA 92402-1033
PO BOX 1034, SAN BERNARDINO, CA 92402-1034
PO BOX 1035, SAN BERNARDINO, CA 92402-1035
PO BOX 1036, SAN BERNARDINO, CA 92402-1036
PO BOX 1037, SAN BERNARDINO, CA 92402-1037
PO BOX 1038, SAN BERNARDINO, CA 92402-1038
PO BOX 1039, SAN BERNARDINO, CA 92402-1039
PO BOX 1040, SAN BERNARDINO, CA 92402-1040
PO BOX 1041, SAN BERNARDINO, CA 92402-1041
PO BOX 1042, SAN BERNARDINO, CA 92402-1042
PO BOX 1043, SAN BERNARDINO, CA 92402-1043
PO BOX 1044, SAN BERNARDINO, CA 92402-1044
PO BOX 1045, SAN BERNARDINO, CA 92402-1045
PO BOX 1046, SAN BERNARDINO, CA 92402-1046
PO BOX 1047, SAN BERNARDINO, CA 92402-1047
PO BOX 1048, SAN BERNARDINO, CA 92402-1048
PO BOX 1049, SAN BERNARDINO, CA 92402-1049
PO BOX 1050, SAN BERNARDINO, CA 92402-1050
PO BOX 1051, SAN BERNARDINO, CA 92402-1051
PO BOX 1052, SAN BERNARDINO, CA 92402-1052
PO BOX 1053, SAN BERNARDINO, CA 92402-1053
PO BOX 1054, SAN BERNARDINO, CA 92402-1054
PO BOX 1055, SAN BERNARDINO, CA 92402-1055
PO BOX 1056, SAN BERNARDINO, CA 92402-1056
PO BOX 1057, SAN BERNARDINO, CA 92402-1057
PO BOX 1058, SAN BERNARDINO, CA 92402-1058
PO BOX 1059, SAN BERNARDINO, CA 92402-1059
PO BOX 1060, SAN BERNARDINO, CA 92402-1060
PO BOX 1061, SAN BERNARDINO, CA 92402-1061
PO BOX 1062, SAN BERNARDINO, CA 92402-1062
PO BOX 1063, SAN BERNARDINO, CA 92402-1063
PO BOX 1064, SAN BERNARDINO, CA 92402-1064
PO BOX 1065, SAN BERNARDINO, CA 92402-1065
PO BOX 1066, SAN BERNARDINO, CA 92402-1066
PO BOX 1067, SAN BERNARDINO, CA 92402-1067
PO BOX 1068, SAN BERNARDINO, CA 92402-1068
PO BOX 1069, SAN BERNARDINO, CA 92402-1069
PO BOX 1070, SAN BERNARDINO, CA 92402-1070
PO BOX 1071, SAN BERNARDINO, CA 92402-1071
PO BOX 1072, SAN BERNARDINO, CA 92402-1072
PO BOX 1073, SAN BERNARDINO, CA 92402-1073
PO BOX 1074, SAN BERNARDINO, CA 92402-1074
PO BOX 1075, SAN BERNARDINO, CA 92402-1075
PO BOX 1076, SAN BERNARDINO, CA 92402-1076
PO BOX 1077, SAN BERNARDINO, CA 92402-1077
PO BOX 1078, SAN BERNARDINO, CA 92402-1078
PO BOX 1079, SAN BERNARDINO, CA 92402-1079
PO BOX 1080, SAN BERNARDINO, CA 92402-1080
PO BOX 1081, SAN BERNARDINO, CA 92402-1081
PO BOX 1082, SAN BERNARDINO, CA 92402-1082
PO BOX 1083, SAN BERNARDINO, CA 92402-1083
PO BOX 1084, SAN BERNARDINO, CA 92402-1084
PO BOX 1085, SAN BERNARDINO, CA 92402-1085
PO BOX 1086, SAN BERNARDINO, CA 92402-1086
PO BOX 1087, SAN BERNARDINO, CA 92402-1087
PO BOX 1088, SAN BERNARDINO, CA 92402-1088
PO BOX 1089, SAN BERNARDINO, CA 92402-1089
PO BOX 1090, SAN BERNARDINO, CA 92402-1090
PO BOX 1091, SAN BERNARDINO, CA 92402-1091
PO BOX 1092, SAN BERNARDINO, CA 92402-1092
PO BOX 1093, SAN BERNARDINO, CA 92402-1093
PO BOX 1094, SAN BERNARDINO, CA 92402-1094
PO BOX 1095, SAN BERNARDINO, CA 92402-1095
PO BOX 1096, SAN BERNARDINO, CA 92402-1096
PO BOX 1097, SAN BERNARDINO, CA 92402-1097
PO BOX 1098, SAN BERNARDINO, CA 92402-1098
PO BOX 1099, SAN BERNARDINO, CA 92402-1099
PO BOX 1100, SAN BERNARDINO, CA 92402-1100
PO BOX 1101, SAN BERNARDINO, CA 92402-1101
PO BOX 1102, SAN BERNARDINO, CA 92402-1102
PO BOX 1103, SAN BERNARDINO, CA 92402-1103
PO BOX 1104, SAN BERNARDINO, CA 92402-1104
PO BOX 1105, SAN BERNARDINO, CA 92402-1105
PO BOX 1106, SAN BERNARDINO, CA 92402-1106
PO BOX 1107, SAN BERNARDINO, CA 92402-1107
PO BOX 1108, SAN BERNARDINO, CA 92402-1108
PO BOX 1109, SAN BERNARDINO, CA 92402-1109
PO BOX 1110, SAN BERNARDINO, CA 92402-1110
PO BOX 1111, SAN BERNARDINO, CA 92402-1111
PO BOX 1112, SAN BERNARDINO, CA 92402-1112
PO BOX 1113, SAN BERNARDINO, CA 92402-1113
PO BOX 1114, SAN BERNARDINO, CA 92402-1114
PO BOX 1115, SAN BERNARDINO, CA 92402-1115
PO BOX 1116, SAN BERNARDINO, CA 92402-1116
PO BOX 1117, SAN BERNARDINO, CA 92402-1117
PO BOX 1118, SAN BERNARDINO, CA 92402-1118
PO BOX 1119, SAN BERNARDINO, CA 92402-1119
PO BOX 1120, SAN BERNARDINO, CA 92402-1120
PO BOX 1121, SAN BERNARDINO, CA 92402-1121
PO BOX 1122, SAN BERNARDINO, CA 92402-1122
PO BOX 1123, SAN BERNARDINO, CA 92402-1123
PO BOX 1124, SAN BERNARDINO, CA 92402-1124
PO BOX 1125, SAN BERNARDINO, CA 92402-1125
PO BOX 1126, SAN BERNARDINO, CA 92402-1126
PO BOX 1127, SAN BERNARDINO, CA 92402-1127
PO BOX 1128, SAN BERNARDINO, CA 92402-1128
PO BOX 1129, SAN BERNARDINO, CA 92402-1129
PO BOX 1130, SAN BERNARDINO, CA 92402-1130
PO BOX 1131, SAN BERNARDINO, CA 92402-1131
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