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 1030, CARLSBAD, CA 92018-1030
PO BOX 1031, CARLSBAD, CA 92018-1031
PO BOX 1032, CARLSBAD, CA 92018-1032
PO BOX 1033, CARLSBAD, CA 92018-1033
PO BOX 1034, CARLSBAD, CA 92018-1034
PO BOX 1035, CARLSBAD, CA 92018-1035
PO BOX 1036, CARLSBAD, CA 92018-1036
PO BOX 1037, CARLSBAD, CA 92018-1037
PO BOX 1038, CARLSBAD, CA 92018-1038
PO BOX 1039, CARLSBAD, CA 92018-1039
PO BOX 1040, CARLSBAD, CA 92018-1040
PO BOX 1041, CARLSBAD, CA 92018-1041
PO BOX 1042, CARLSBAD, CA 92018-1042
PO BOX 1043, CARLSBAD, CA 92018-1043
PO BOX 1044, CARLSBAD, CA 92018-1044
PO BOX 1045, CARLSBAD, CA 92018-1045
PO BOX 1046, CARLSBAD, CA 92018-1046
PO BOX 1047, CARLSBAD, CA 92018-1047
PO BOX 1048, CARLSBAD, CA 92018-1048
PO BOX 1049, CARLSBAD, CA 92018-1049
PO BOX 1050, CARLSBAD, CA 92018-1050
PO BOX 1051, CARLSBAD, CA 92018-1051
PO BOX 1052, CARLSBAD, CA 92018-1052
PO BOX 1053, CARLSBAD, CA 92018-1053
PO BOX 1054, CARLSBAD, CA 92018-1054
PO BOX 1055, CARLSBAD, CA 92018-1055
PO BOX 1056, CARLSBAD, CA 92018-1056
PO BOX 1057, CARLSBAD, CA 92018-1057
PO BOX 1058, CARLSBAD, CA 92018-1058
PO BOX 1059, CARLSBAD, CA 92018-1059
PO BOX 1060, CARLSBAD, CA 92018-1060
PO BOX 1061, CARLSBAD, CA 92018-1061
PO BOX 1062, CARLSBAD, CA 92018-1062
PO BOX 1063, CARLSBAD, CA 92018-1063
PO BOX 1064, CARLSBAD, CA 92018-1064
PO BOX 1065, CARLSBAD, CA 92018-1065
PO BOX 1066, CARLSBAD, CA 92018-1066
PO BOX 1067, CARLSBAD, CA 92018-1067
PO BOX 1068, CARLSBAD, CA 92018-1068
PO BOX 1069, CARLSBAD, CA 92018-1069
PO BOX 1070, CARLSBAD, CA 92018-1070
PO BOX 1071, CARLSBAD, CA 92018-1071
PO BOX 1072, CARLSBAD, CA 92018-1072
PO BOX 1073, CARLSBAD, CA 92018-1073
PO BOX 1074, CARLSBAD, CA 92018-1074
PO BOX 1075, CARLSBAD, CA 92018-1075
PO BOX 1076, CARLSBAD, CA 92018-1076
PO BOX 1077, CARLSBAD, CA 92018-1077
PO BOX 1078, CARLSBAD, CA 92018-1078
PO BOX 1079, CARLSBAD, CA 92018-1079
PO BOX 1080, CARLSBAD, CA 92018-1080
PO BOX 1081, CARLSBAD, CA 92018-1081
PO BOX 1082, CARLSBAD, CA 92018-1082
PO BOX 1083, CARLSBAD, CA 92018-1083
PO BOX 1084, CARLSBAD, CA 92018-1084
PO BOX 1085, CARLSBAD, CA 92018-1085
PO BOX 1086, CARLSBAD, CA 92018-1086
PO BOX 1087, CARLSBAD, CA 92018-1087
PO BOX 1088, CARLSBAD, CA 92018-1088
PO BOX 1089, CARLSBAD, CA 92018-1089
PO BOX 1090, CARLSBAD, CA 92018-1090
PO BOX 1091, CARLSBAD, CA 92018-1091
PO BOX 1092, CARLSBAD, CA 92018-1092
PO BOX 1093, CARLSBAD, CA 92018-1093
PO BOX 1094, CARLSBAD, CA 92018-1094
PO BOX 1095, CARLSBAD, CA 92018-1095
PO BOX 1096, CARLSBAD, CA 92018-1096
PO BOX 1097, CARLSBAD, CA 92018-1097
PO BOX 1098, CARLSBAD, CA 92018-1098
PO BOX 1099, CARLSBAD, CA 92018-1099
PO BOX 1100, CARLSBAD, CA 92018-1100
PO BOX 1101, CARLSBAD, CA 92018-1101
PO BOX 1102, CARLSBAD, CA 92018-1102
PO BOX 1103, CARLSBAD, CA 92018-1103
PO BOX 1104, CARLSBAD, CA 92018-1104
PO BOX 1105, CARLSBAD, CA 92018-1105
PO BOX 1106, CARLSBAD, CA 92018-1106
PO BOX 1107, CARLSBAD, CA 92018-1107
PO BOX 1108, CARLSBAD, CA 92018-1108
PO BOX 1109, CARLSBAD, CA 92018-1109
PO BOX 1110, CARLSBAD, CA 92018-1110
PO BOX 1111, CARLSBAD, CA 92018-1111
PO BOX 1112, CARLSBAD, CA 92018-1112
PO BOX 1113, CARLSBAD, CA 92018-1113
PO BOX 1114, CARLSBAD, CA 92018-1114
PO BOX 1115, CARLSBAD, CA 92018-1115
PO BOX 1116, CARLSBAD, CA 92018-1116
PO BOX 1117, CARLSBAD, CA 92018-1117
PO BOX 1118, CARLSBAD, CA 92018-1118
PO BOX 1119, CARLSBAD, CA 92018-1119
PO BOX 1120, CARLSBAD, CA 92018-1120
PO BOX 1121, CARLSBAD, CA 92018-1121
PO BOX 1122, CARLSBAD, CA 92018-1122
PO BOX 1123, CARLSBAD, CA 92018-1123
PO BOX 1124, CARLSBAD, CA 92018-1124
PO BOX 1125, CARLSBAD, CA 92018-1125
PO BOX 1126, CARLSBAD, CA 92018-1126
PO BOX 1127, CARLSBAD, CA 92018-1127
PO BOX 1128, CARLSBAD, CA 92018-1128
PO BOX 1129, CARLSBAD, CA 92018-1129
PO BOX 1130, CARLSBAD, CA 92018-1130
PO BOX 1131, CARLSBAD, CA 92018-1131
PO BOX 1132, CARLSBAD, CA 92018-1132
PO BOX 1133, CARLSBAD, CA 92018-1133
PO BOX 1134, CARLSBAD, CA 92018-1134
PO BOX 1135, CARLSBAD, CA 92018-1135
PO BOX 1136, CARLSBAD, CA 92018-1136
PO BOX 1137, CARLSBAD, CA 92018-1137
PO BOX 1138, CARLSBAD, CA 92018-1138
PO BOX 1139, CARLSBAD, CA 92018-1139
PO BOX 1140, CARLSBAD, CA 92018-1140
PO BOX 1141, CARLSBAD, CA 92018-1141
PO BOX 1142, CARLSBAD, CA 92018-1142
PO BOX 1143, CARLSBAD, CA 92018-1143
PO BOX 1144, CARLSBAD, CA 92018-1144
PO BOX 1145, CARLSBAD, CA 92018-1145
PO BOX 1146, CARLSBAD, CA 92018-1146
PO BOX 1147, CARLSBAD, CA 92018-1147
PO BOX 1148, CARLSBAD, CA 92018-1148
PO BOX 1149, CARLSBAD, CA 92018-1149
PO BOX 1150, CARLSBAD, CA 92018-1150
PO BOX 1151, CARLSBAD, CA 92018-1151
PO BOX 1152, CARLSBAD, CA 92018-1152
PO BOX 1153, CARLSBAD, CA 92018-1153
PO BOX 1154, CARLSBAD, CA 92018-1154
PO BOX 1155, CARLSBAD, CA 92018-1155
PO BOX 1156, CARLSBAD, CA 92018-1156
PO BOX 1157, CARLSBAD, CA 92018-1157
PO BOX 1158, CARLSBAD, CA 92018-1158
PO BOX 1159, CARLSBAD, CA 92018-1159
PO BOX 1160, CARLSBAD, CA 92018-1160
PO BOX 1161, CARLSBAD, CA 92018-1161
PO BOX 1162, CARLSBAD, CA 92018-1162
PO BOX 1163, CARLSBAD, CA 92018-1163
PO BOX 1164, CARLSBAD, CA 92018-1164
PO BOX 1165, CARLSBAD, CA 92018-1165
PO BOX 1166, CARLSBAD, CA 92018-1166
PO BOX 1167, CARLSBAD, CA 92018-1167
PO BOX 1168, CARLSBAD, CA 92018-1168
PO BOX 1169, CARLSBAD, CA 92018-1169
PO BOX 1170, CARLSBAD, CA 92018-1170
PO BOX 1171, CARLSBAD, CA 92018-1171
PO BOX 1172, CARLSBAD, CA 92018-1172
PO BOX 1173, CARLSBAD, CA 92018-1173
PO BOX 1174, CARLSBAD, CA 92018-1174
PO BOX 1175, CARLSBAD, CA 92018-1175
PO BOX 1176, CARLSBAD, CA 92018-1176
PO BOX 1177, CARLSBAD, CA 92018-1177
PO BOX 1178, CARLSBAD, CA 92018-1178
PO BOX 1179, CARLSBAD, CA 92018-1179
PO BOX 1180, CARLSBAD, CA 92018-1180
PO BOX 1181, CARLSBAD, CA 92018-1181
PO BOX 1182, CARLSBAD, CA 92018-1182
PO BOX 1183, CARLSBAD, CA 92018-1183
PO BOX 1184, CARLSBAD, CA 92018-1184
PO BOX 1185, CARLSBAD, CA 92018-1185
PO BOX 1186, CARLSBAD, CA 92018-1186
PO BOX 1187, CARLSBAD, CA 92018-1187
PO BOX 1188, CARLSBAD, CA 92018-1188
PO BOX 1189, CARLSBAD, CA 92018-1189
PO BOX 1190, CARLSBAD, CA 92018-1190
PO BOX 1191, CARLSBAD, CA 92018-1191
PO BOX 1192, CARLSBAD, CA 92018-1192
PO BOX 1193, CARLSBAD, CA 92018-1193
PO BOX 1194, CARLSBAD, CA 92018-1194
PO BOX 1195, CARLSBAD, CA 92018-1195
PO BOX 1196, CARLSBAD, CA 92018-1196
PO BOX 1197, CARLSBAD, CA 92018-1197
PO BOX 1198, CARLSBAD, CA 92018-1198
PO BOX 1199, CARLSBAD, CA 92018-1199
PO BOX 1200, CARLSBAD, CA 92018-1200
PO BOX 1201, CARLSBAD, CA 92018-1201
PO BOX 1202, CARLSBAD, CA 92018-1202
PO BOX 1203, CARLSBAD, CA 92018-1203
PO BOX 1204, CARLSBAD, CA 92018-1204
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