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 1081, SAN MARCOS, CA 92079-1081
PO BOX 1082, SAN MARCOS, CA 92079-1082
PO BOX 1083, SAN MARCOS, CA 92079-1083
PO BOX 1084, SAN MARCOS, CA 92079-1084
PO BOX 1085, SAN MARCOS, CA 92079-1085
PO BOX 1086, SAN MARCOS, CA 92079-1086
PO BOX 1087, SAN MARCOS, CA 92079-1087
PO BOX 1088, SAN MARCOS, CA 92079-1088
PO BOX 1089, SAN MARCOS, CA 92079-1089
PO BOX 1090, SAN MARCOS, CA 92079-1090
PO BOX 1091, SAN MARCOS, CA 92079-1091
PO BOX 1092, SAN MARCOS, CA 92079-1092
PO BOX 1093, SAN MARCOS, CA 92079-1093
PO BOX 1094, SAN MARCOS, CA 92079-1094
PO BOX 1095, SAN MARCOS, CA 92079-1095
PO BOX 1096, SAN MARCOS, CA 92079-1096
PO BOX 1097, SAN MARCOS, CA 92079-1097
PO BOX 1098, SAN MARCOS, CA 92079-1098
PO BOX 1099, SAN MARCOS, CA 92079-1099
PO BOX 1100, SAN MARCOS, CA 92079-1100
PO BOX 1101, SAN MARCOS, CA 92079-1101
PO BOX 1102, SAN MARCOS, CA 92079-1102
PO BOX 1103, SAN MARCOS, CA 92079-1103
PO BOX 1104, SAN MARCOS, CA 92079-1104
PO BOX 1105, SAN MARCOS, CA 92079-1105
PO BOX 1106, SAN MARCOS, CA 92079-1106
PO BOX 1107, SAN MARCOS, CA 92079-1107
PO BOX 1108, SAN MARCOS, CA 92079-1108
PO BOX 1109, SAN MARCOS, CA 92079-1109
PO BOX 1110, SAN MARCOS, CA 92079-1110
PO BOX 1111, SAN MARCOS, CA 92079-1111
PO BOX 1112, SAN MARCOS, CA 92079-1112
PO BOX 1113, SAN MARCOS, CA 92079-1113
PO BOX 1114, SAN MARCOS, CA 92079-1114
PO BOX 1115, SAN MARCOS, CA 92079-1115
PO BOX 1116, SAN MARCOS, CA 92079-1116
PO BOX 1117, SAN MARCOS, CA 92079-1117
PO BOX 1118, SAN MARCOS, CA 92079-1118
PO BOX 1119, SAN MARCOS, CA 92079-1119
PO BOX 1120, SAN MARCOS, CA 92079-1120
PO BOX 1121, SAN MARCOS, CA 92079-1121
PO BOX 1122, SAN MARCOS, CA 92079-1122
PO BOX 1123, SAN MARCOS, CA 92079-1123
PO BOX 1124, SAN MARCOS, CA 92079-1124
PO BOX 1125, SAN MARCOS, CA 92079-1125
PO BOX 1126, SAN MARCOS, CA 92079-1126
PO BOX 1127, SAN MARCOS, CA 92079-1127
PO BOX 1128, SAN MARCOS, CA 92079-1128
PO BOX 1129, SAN MARCOS, CA 92079-1129
PO BOX 1130, SAN MARCOS, CA 92079-1130
PO BOX 1131, SAN MARCOS, CA 92079-1131
PO BOX 1132, SAN MARCOS, CA 92079-1132
PO BOX 1133, SAN MARCOS, CA 92079-1133
PO BOX 1134, SAN MARCOS, CA 92079-1134
PO BOX 1135, SAN MARCOS, CA 92079-1135
PO BOX 1136, SAN MARCOS, CA 92079-1136
PO BOX 1137, SAN MARCOS, CA 92079-1137
PO BOX 1138, SAN MARCOS, CA 92079-1138
PO BOX 1139, SAN MARCOS, CA 92079-1139
PO BOX 1140, SAN MARCOS, CA 92079-1140
PO BOX 1141, SAN MARCOS, CA 92079-1141
PO BOX 1142, SAN MARCOS, CA 92079-1142
PO BOX 1143, SAN MARCOS, CA 92079-1143
PO BOX 1144, SAN MARCOS, CA 92079-1144
PO BOX 1145, SAN MARCOS, CA 92079-1145
PO BOX 1146, SAN MARCOS, CA 92079-1146
PO BOX 1147, SAN MARCOS, CA 92079-1147
PO BOX 1148, SAN MARCOS, CA 92079-1148
PO BOX 1149, SAN MARCOS, CA 92079-1149
PO BOX 1150, SAN MARCOS, CA 92079-1150
PO BOX 1151, SAN MARCOS, CA 92079-1151
PO BOX 1152, SAN MARCOS, CA 92079-1152
PO BOX 1153, SAN MARCOS, CA 92079-1153
PO BOX 1154, SAN MARCOS, CA 92079-1154
PO BOX 1155, SAN MARCOS, CA 92079-1155
PO BOX 1156, SAN MARCOS, CA 92079-1156
PO BOX 1157, SAN MARCOS, CA 92079-1157
PO BOX 1158, SAN MARCOS, CA 92079-1158
PO BOX 1159, SAN MARCOS, CA 92079-1159
PO BOX 1160, SAN MARCOS, CA 92079-1160
PO BOX 1161, SAN MARCOS, CA 92079-1161
PO BOX 1162, SAN MARCOS, CA 92079-1162
PO BOX 1163, SAN MARCOS, CA 92079-1163
PO BOX 1164, SAN MARCOS, CA 92079-1164
PO BOX 1165, SAN MARCOS, CA 92079-1165
PO BOX 1166, SAN MARCOS, CA 92079-1166
PO BOX 1167, SAN MARCOS, CA 92079-1167
PO BOX 1168, SAN MARCOS, CA 92079-1168
PO BOX 1169, SAN MARCOS, CA 92079-1169
PO BOX 1170, SAN MARCOS, CA 92079-1170
PO BOX 1171, SAN MARCOS, CA 92079-1171
PO BOX 1172, SAN MARCOS, CA 92079-1172
PO BOX 1173, SAN MARCOS, CA 92079-1173
PO BOX 1174, SAN MARCOS, CA 92079-1174
PO BOX 1175, SAN MARCOS, CA 92079-1175
PO BOX 1176, SAN MARCOS, CA 92079-1176
PO BOX 1177, SAN MARCOS, CA 92079-1177
PO BOX 1178, SAN MARCOS, CA 92079-1178
PO BOX 1179, SAN MARCOS, CA 92079-1179
PO BOX 1180, SAN MARCOS, CA 92079-1180
PO BOX 1181, SAN MARCOS, CA 92079-1181
PO BOX 1182, SAN MARCOS, CA 92079-1182
PO BOX 1183, SAN MARCOS, CA 92079-1183
PO BOX 1184, SAN MARCOS, CA 92079-1184
PO BOX 1185, SAN MARCOS, CA 92079-1185
PO BOX 1186, SAN MARCOS, CA 92079-1186
PO BOX 1187, SAN MARCOS, CA 92079-1187
PO BOX 1188, SAN MARCOS, CA 92079-1188
PO BOX 1189, SAN MARCOS, CA 92079-1189
PO BOX 1190, SAN MARCOS, CA 92079-1190
PO BOX 1191, SAN MARCOS, CA 92079-1191
PO BOX 1192, SAN MARCOS, CA 92079-1192
PO BOX 1193, SAN MARCOS, CA 92079-1193
PO BOX 1194, SAN MARCOS, CA 92079-1194
PO BOX 1195, SAN MARCOS, CA 92079-1195
PO BOX 1196, SAN MARCOS, CA 92079-1196
PO BOX 1197, SAN MARCOS, CA 92079-1197
PO BOX 1198, SAN MARCOS, CA 92079-1198
PO BOX 1199, SAN MARCOS, CA 92079-1199
PO BOX 1200, SAN MARCOS, CA 92079-1200
PO BOX 1201, SAN MARCOS, CA 92079-1201
PO BOX 1202, SAN MARCOS, CA 92079-1202
PO BOX 1203, SAN MARCOS, CA 92079-1203
PO BOX 1204, SAN MARCOS, CA 92079-1204
PO BOX 1205, SAN MARCOS, CA 92079-1205
PO BOX 1206, SAN MARCOS, CA 92079-1206
PO BOX 1207, SAN MARCOS, CA 92079-1207
PO BOX 1208, SAN MARCOS, CA 92079-1208
PO BOX 1209, SAN MARCOS, CA 92079-1209
PO BOX 1210, SAN MARCOS, CA 92079-1210
PO BOX 1211, SAN MARCOS, CA 92079-1211
PO BOX 1212, SAN MARCOS, CA 92079-1212
PO BOX 1213, SAN MARCOS, CA 92079-1213
PO BOX 1214, SAN MARCOS, CA 92079-1214
PO BOX 1215, SAN MARCOS, CA 92079-1215
PO BOX 1216, SAN MARCOS, CA 92079-1216
PO BOX 1217, SAN MARCOS, CA 92079-1217
PO BOX 1218, SAN MARCOS, CA 92079-1218
PO BOX 1219, SAN MARCOS, CA 92079-1219
PO BOX 1220, SAN MARCOS, CA 92079-1220
PO BOX 1221, SAN MARCOS, CA 92079-1221
PO BOX 1222, SAN MARCOS, CA 92079-1222
PO BOX 1223, SAN MARCOS, CA 92079-1223
PO BOX 1224, SAN MARCOS, CA 92079-1224
PO BOX 1225, SAN MARCOS, CA 92079-1225
PO BOX 1226, SAN MARCOS, CA 92079-1226
PO BOX 1227, SAN MARCOS, CA 92079-1227
PO BOX 1228, SAN MARCOS, CA 92079-1228
PO BOX 1229, SAN MARCOS, CA 92079-1229
PO BOX 1230, SAN MARCOS, CA 92079-1230
PO BOX 1231, SAN MARCOS, CA 92079-1231
PO BOX 1232, SAN MARCOS, CA 92079-1232
PO BOX 1233, SAN MARCOS, CA 92079-1233
PO BOX 1234, SAN MARCOS, CA 92079-1234
PO BOX 1235, SAN MARCOS, CA 92079-1235
PO BOX 1236, SAN MARCOS, CA 92079-1236
PO BOX 1237, SAN MARCOS, CA 92079-1237
PO BOX 1238, SAN MARCOS, CA 92079-1238
PO BOX 1239, SAN MARCOS, CA 92079-1239
PO BOX 1240, SAN MARCOS, CA 92079-1240
PO BOX 1241, SAN MARCOS, CA 92079-1241
PO BOX 1242, SAN MARCOS, CA 92079-1242
PO BOX 1243, SAN MARCOS, CA 92079-1243
PO BOX 1244, SAN MARCOS, CA 92079-1244
PO BOX 1245, SAN MARCOS, CA 92079-1245
PO BOX 1246, SAN MARCOS, CA 92079-1246
PO BOX 1247, SAN MARCOS, CA 92079-1247
PO BOX 1248, SAN MARCOS, CA 92079-1248
PO BOX 1249, SAN MARCOS, CA 92079-1249
PO BOX 1250, SAN MARCOS, CA 92079-1250
PO BOX 1251, SAN MARCOS, CA 92079-1251
PO BOX 1252, SAN MARCOS, CA 92079-1252
PO BOX 1253, SAN MARCOS, CA 92079-1253
PO BOX 1254, SAN MARCOS, CA 92079-1254
PO BOX 1255, SAN MARCOS, CA 92079-1255
PO BOX 1256, SAN MARCOS, CA 92079-1256
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