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 1021, FALLBROOK, CA 92088-1021
PO BOX 1022, FALLBROOK, CA 92088-1022
PO BOX 1023, FALLBROOK, CA 92088-1023
PO BOX 1024, FALLBROOK, CA 92088-1024
PO BOX 1025, FALLBROOK, CA 92088-1025
PO BOX 1026, FALLBROOK, CA 92088-1026
PO BOX 1027, FALLBROOK, CA 92088-1027
PO BOX 1028, FALLBROOK, CA 92088-1028
PO BOX 1029, FALLBROOK, CA 92088-1029
PO BOX 1030, FALLBROOK, CA 92088-1030
PO BOX 1031, FALLBROOK, CA 92088-1031
PO BOX 1032, FALLBROOK, CA 92088-1032
PO BOX 1033, FALLBROOK, CA 92088-1033
PO BOX 1034, FALLBROOK, CA 92088-1034
PO BOX 1035, FALLBROOK, CA 92088-1035
PO BOX 1036, FALLBROOK, CA 92088-1036
PO BOX 1037, FALLBROOK, CA 92088-1037
PO BOX 1038, FALLBROOK, CA 92088-1038
PO BOX 1039, FALLBROOK, CA 92088-1039
PO BOX 1040, FALLBROOK, CA 92088-1040
PO BOX 1041, FALLBROOK, CA 92088-1041
PO BOX 1042, FALLBROOK, CA 92088-1042
PO BOX 1043, FALLBROOK, CA 92088-1043
PO BOX 1044, FALLBROOK, CA 92088-1044
PO BOX 1045, FALLBROOK, CA 92088-1045
PO BOX 1046, FALLBROOK, CA 92088-1046
PO BOX 1047, FALLBROOK, CA 92088-1047
PO BOX 1048, FALLBROOK, CA 92088-1048
PO BOX 1049, FALLBROOK, CA 92088-1049
PO BOX 1050, FALLBROOK, CA 92088-1050
PO BOX 1051, FALLBROOK, CA 92088-1051
PO BOX 1052, FALLBROOK, CA 92088-1052
PO BOX 1053, FALLBROOK, CA 92088-1053
PO BOX 1054, FALLBROOK, CA 92088-1054
PO BOX 1055, FALLBROOK, CA 92088-1055
PO BOX 1056, FALLBROOK, CA 92088-1056
PO BOX 1057, FALLBROOK, CA 92088-1057
PO BOX 1058, FALLBROOK, CA 92088-1058
PO BOX 1059, FALLBROOK, CA 92088-1059
PO BOX 1060, FALLBROOK, CA 92088-1060
PO BOX 1061, FALLBROOK, CA 92088-1061
PO BOX 1062, FALLBROOK, CA 92088-1062
PO BOX 1063, FALLBROOK, CA 92088-1063
PO BOX 1064, FALLBROOK, CA 92088-1064
PO BOX 1065, FALLBROOK, CA 92088-1065
PO BOX 1066, FALLBROOK, CA 92088-1066
PO BOX 1067, FALLBROOK, CA 92088-1067
PO BOX 1068, FALLBROOK, CA 92088-1068
PO BOX 1069, FALLBROOK, CA 92088-1069
PO BOX 1070, FALLBROOK, CA 92088-1070
PO BOX 1071, FALLBROOK, CA 92088-1071
PO BOX 1072, FALLBROOK, CA 92088-1072
PO BOX 1073, FALLBROOK, CA 92088-1073
PO BOX 1074, FALLBROOK, CA 92088-1074
PO BOX 1075, FALLBROOK, CA 92088-1075
PO BOX 1076, FALLBROOK, CA 92088-1076
PO BOX 1077, FALLBROOK, CA 92088-1077
PO BOX 1078, FALLBROOK, CA 92088-1078
PO BOX 1079, FALLBROOK, CA 92088-1079
PO BOX 1080, FALLBROOK, CA 92088-1080
PO BOX 1081, FALLBROOK, CA 92088-1081
PO BOX 1082, FALLBROOK, CA 92088-1082
PO BOX 1083, FALLBROOK, CA 92088-1083
PO BOX 1084, FALLBROOK, CA 92088-1084
PO BOX 1085, FALLBROOK, CA 92088-1085
PO BOX 1086, FALLBROOK, CA 92088-1086
PO BOX 1087, FALLBROOK, CA 92088-1087
PO BOX 1088, FALLBROOK, CA 92088-1088
PO BOX 1089, FALLBROOK, CA 92088-1089
PO BOX 1090, FALLBROOK, CA 92088-1090
PO BOX 1091, FALLBROOK, CA 92088-1091
PO BOX 1092, FALLBROOK, CA 92088-1092
PO BOX 1093, FALLBROOK, CA 92088-1093
PO BOX 1094, FALLBROOK, CA 92088-1094
PO BOX 1095, FALLBROOK, CA 92088-1095
PO BOX 1096, FALLBROOK, CA 92088-1096
PO BOX 1097, FALLBROOK, CA 92088-1097
PO BOX 1098, FALLBROOK, CA 92088-1098
PO BOX 1099, FALLBROOK, CA 92088-1099
PO BOX 1100, FALLBROOK, CA 92088-1100
PO BOX 1101, FALLBROOK, CA 92088-1101
PO BOX 1102, FALLBROOK, CA 92088-1102
PO BOX 1103, FALLBROOK, CA 92088-1103
PO BOX 1104, FALLBROOK, CA 92088-1104
PO BOX 1105, FALLBROOK, CA 92088-1105
PO BOX 1106, FALLBROOK, CA 92088-1106
PO BOX 1107, FALLBROOK, CA 92088-1107
PO BOX 1108, FALLBROOK, CA 92088-1108
PO BOX 1109, FALLBROOK, CA 92088-1109
PO BOX 1110, FALLBROOK, CA 92088-1110
PO BOX 1111, FALLBROOK, CA 92088-1111
PO BOX 1112, FALLBROOK, CA 92088-1112
PO BOX 1113, FALLBROOK, CA 92088-1113
PO BOX 1114, FALLBROOK, CA 92088-1114
PO BOX 1115, FALLBROOK, CA 92088-1115
PO BOX 1116, FALLBROOK, CA 92088-1116
PO BOX 1117, FALLBROOK, CA 92088-1117
PO BOX 1118, FALLBROOK, CA 92088-1118
PO BOX 1119, FALLBROOK, CA 92088-1119
PO BOX 1120, FALLBROOK, CA 92088-1120
PO BOX 1121, FALLBROOK, CA 92088-1121
PO BOX 1122, FALLBROOK, CA 92088-1122
PO BOX 1123, FALLBROOK, CA 92088-1123
PO BOX 1124, FALLBROOK, CA 92088-1124
PO BOX 1125, FALLBROOK, CA 92088-1125
PO BOX 1126, FALLBROOK, CA 92088-1126
PO BOX 1127, FALLBROOK, CA 92088-1127
PO BOX 1128, FALLBROOK, CA 92088-1128
PO BOX 1129, FALLBROOK, CA 92088-1129
PO BOX 1130, FALLBROOK, CA 92088-1130
PO BOX 1131, FALLBROOK, CA 92088-1131
PO BOX 1132, FALLBROOK, CA 92088-1132
PO BOX 1133, FALLBROOK, CA 92088-1133
PO BOX 1134, FALLBROOK, CA 92088-1134
PO BOX 1135, FALLBROOK, CA 92088-1135
PO BOX 1136, FALLBROOK, CA 92088-1136
PO BOX 1137, FALLBROOK, CA 92088-1137
PO BOX 1138, FALLBROOK, CA 92088-1138
PO BOX 1139, FALLBROOK, CA 92088-1139
PO BOX 1140, FALLBROOK, CA 92088-1140
PO BOX 1141, FALLBROOK, CA 92088-1141
PO BOX 1142, FALLBROOK, CA 92088-1142
PO BOX 1143, FALLBROOK, CA 92088-1143
PO BOX 1144, FALLBROOK, CA 92088-1144
PO BOX 1145, FALLBROOK, CA 92088-1145
PO BOX 1146, FALLBROOK, CA 92088-1146
PO BOX 1147, FALLBROOK, CA 92088-1147
PO BOX 1148, FALLBROOK, CA 92088-1148
PO BOX 1149, FALLBROOK, CA 92088-1149
PO BOX 1150, FALLBROOK, CA 92088-1150
PO BOX 1151, FALLBROOK, CA 92088-1151
PO BOX 1152, FALLBROOK, CA 92088-1152
PO BOX 1153, FALLBROOK, CA 92088-1153
PO BOX 1154, FALLBROOK, CA 92088-1154
PO BOX 1155, FALLBROOK, CA 92088-1155
PO BOX 1156, FALLBROOK, CA 92088-1156
PO BOX 1157, FALLBROOK, CA 92088-1157
PO BOX 1158, FALLBROOK, CA 92088-1158
PO BOX 1159, FALLBROOK, CA 92088-1159
PO BOX 1160, FALLBROOK, CA 92088-1160
PO BOX 1161, FALLBROOK, CA 92088-1161
PO BOX 1162, FALLBROOK, CA 92088-1162
PO BOX 1163, FALLBROOK, CA 92088-1163
PO BOX 1164, FALLBROOK, CA 92088-1164
PO BOX 1165, FALLBROOK, CA 92088-1165
PO BOX 1166, FALLBROOK, CA 92088-1166
PO BOX 1167, FALLBROOK, CA 92088-1167
PO BOX 1168, FALLBROOK, CA 92088-1168
PO BOX 1169, FALLBROOK, CA 92088-1169
PO BOX 1170, FALLBROOK, CA 92088-1170
PO BOX 1171, FALLBROOK, CA 92088-1171
PO BOX 1172, FALLBROOK, CA 92088-1172
PO BOX 1173, FALLBROOK, CA 92088-1173
PO BOX 1174, FALLBROOK, CA 92088-1174
PO BOX 1175, FALLBROOK, CA 92088-1175
PO BOX 1176, FALLBROOK, CA 92088-1176
PO BOX 1177, FALLBROOK, CA 92088-1177
PO BOX 1178, FALLBROOK, CA 92088-1178
PO BOX 1179, FALLBROOK, CA 92088-1179
PO BOX 1180, FALLBROOK, CA 92088-1180
PO BOX 1181, FALLBROOK, CA 92088-1181
PO BOX 1182, FALLBROOK, CA 92088-1182
PO BOX 1183, FALLBROOK, CA 92088-1183
PO BOX 1184, FALLBROOK, CA 92088-1184
PO BOX 1185, FALLBROOK, CA 92088-1185
PO BOX 1186, FALLBROOK, CA 92088-1186
PO BOX 1187, FALLBROOK, CA 92088-1187
PO BOX 1188, FALLBROOK, CA 92088-1188
PO BOX 1189, FALLBROOK, CA 92088-1189
PO BOX 1190, FALLBROOK, CA 92088-1190
PO BOX 1191, FALLBROOK, CA 92088-1191
PO BOX 1192, FALLBROOK, CA 92088-1192
PO BOX 1193, FALLBROOK, CA 92088-1193
PO BOX 1194, FALLBROOK, CA 92088-1194
PO BOX 1195, FALLBROOK, CA 92088-1195
PO BOX 1196, FALLBROOK, CA 92088-1196
PO BOX 1197, FALLBROOK, CA 92088-1197
PO BOX 1198, FALLBROOK, CA 92088-1198
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