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 1121, SAN FERNANDO, CA 91341-1121
PO BOX 1122, SAN FERNANDO, CA 91341-1122
PO BOX 1123, SAN FERNANDO, CA 91341-1123
PO BOX 1124, SAN FERNANDO, CA 91341-1124
PO BOX 1125, SAN FERNANDO, CA 91341-1125
PO BOX 1126, SAN FERNANDO, CA 91341-1126
PO BOX 1127, SAN FERNANDO, CA 91341-1127
PO BOX 1128, SAN FERNANDO, CA 91341-1128
PO BOX 1129, SAN FERNANDO, CA 91341-1129
PO BOX 1130, SAN FERNANDO, CA 91341-1130
PO BOX 1131, SAN FERNANDO, CA 91341-1131
PO BOX 1132, SAN FERNANDO, CA 91341-1132
PO BOX 1133, SAN FERNANDO, CA 91341-1133
PO BOX 1134, SAN FERNANDO, CA 91341-1134
PO BOX 1135, SAN FERNANDO, CA 91341-1135
PO BOX 1136, SAN FERNANDO, CA 91341-1136
PO BOX 1137, SAN FERNANDO, CA 91341-1137
PO BOX 1138, SAN FERNANDO, CA 91341-1138
PO BOX 1139, SAN FERNANDO, CA 91341-1139
PO BOX 1140, SAN FERNANDO, CA 91341-1140
PO BOX 1141, SAN FERNANDO, CA 91341-1141
PO BOX 1142, SAN FERNANDO, CA 91341-1142
PO BOX 1143, SAN FERNANDO, CA 91341-1143
PO BOX 1144, SAN FERNANDO, CA 91341-1144
PO BOX 1145, SAN FERNANDO, CA 91341-1145
PO BOX 1146, SAN FERNANDO, CA 91341-1146
PO BOX 1147, SAN FERNANDO, CA 91341-1147
PO BOX 1148, SAN FERNANDO, CA 91341-1148
PO BOX 1149, SAN FERNANDO, CA 91341-1149
PO BOX 1150, SAN FERNANDO, CA 91341-1150
PO BOX 1151, SAN FERNANDO, CA 91341-1151
PO BOX 1152, SAN FERNANDO, CA 91341-1152
PO BOX 1153, SAN FERNANDO, CA 91341-1153
PO BOX 1154, SAN FERNANDO, CA 91341-1154
PO BOX 1155, SAN FERNANDO, CA 91341-1155
PO BOX 1156, SAN FERNANDO, CA 91341-1156
PO BOX 1157, SAN FERNANDO, CA 91341-1157
PO BOX 1158, SAN FERNANDO, CA 91341-1158
PO BOX 1159, SAN FERNANDO, CA 91341-1159
PO BOX 1160, SAN FERNANDO, CA 91341-1160
PO BOX 1161, SAN FERNANDO, CA 91341-1161
PO BOX 1162, SAN FERNANDO, CA 91341-1162
PO BOX 1163, SAN FERNANDO, CA 91341-1163
PO BOX 1164, SAN FERNANDO, CA 91341-1164
PO BOX 1165, SAN FERNANDO, CA 91341-1165
PO BOX 1166, SAN FERNANDO, CA 91341-1166
PO BOX 1167, SAN FERNANDO, CA 91341-1167
PO BOX 1168, SAN FERNANDO, CA 91341-1168
PO BOX 1169, SAN FERNANDO, CA 91341-1169
PO BOX 1170, SAN FERNANDO, CA 91341-1170
PO BOX 1171, SAN FERNANDO, CA 91341-1171
PO BOX 1172, SAN FERNANDO, CA 91341-1172
PO BOX 1173, SAN FERNANDO, CA 91341-1173
PO BOX 1174, SAN FERNANDO, CA 91341-1174
PO BOX 1175, SAN FERNANDO, CA 91341-1175
PO BOX 1176, SAN FERNANDO, CA 91341-1176
PO BOX 1177, SAN FERNANDO, CA 91341-1177
PO BOX 1178, SAN FERNANDO, CA 91341-1178
PO BOX 1179, SAN FERNANDO, CA 91341-1179
PO BOX 1180, SAN FERNANDO, CA 91341-1180
PO BOX 1181, SAN FERNANDO, CA 91341-1181
PO BOX 1182, SAN FERNANDO, CA 91341-1182
PO BOX 1183, SAN FERNANDO, CA 91341-1183
PO BOX 1184, SAN FERNANDO, CA 91341-1184
PO BOX 1185, SAN FERNANDO, CA 91341-1185
PO BOX 1186, SAN FERNANDO, CA 91341-1186
PO BOX 1187, SAN FERNANDO, CA 91341-1187
PO BOX 1188, SAN FERNANDO, CA 91341-1188
PO BOX 1189, SAN FERNANDO, CA 91341-1189
PO BOX 1190, SAN FERNANDO, CA 91341-1190
PO BOX 1191, SAN FERNANDO, CA 91341-1191
PO BOX 1192, SAN FERNANDO, CA 91341-1192
PO BOX 1193, SAN FERNANDO, CA 91341-1193
PO BOX 1194, SAN FERNANDO, CA 91341-1194
PO BOX 1195, SAN FERNANDO, CA 91341-1195
PO BOX 1196, SAN FERNANDO, CA 91341-1196
PO BOX 1197, SAN FERNANDO, CA 91341-1197
PO BOX 1198, SAN FERNANDO, CA 91341-1198
PO BOX 1199, SAN FERNANDO, CA 91341-1199
PO BOX 1200, SAN FERNANDO, CA 91341-1200
PO BOX 1201, SAN FERNANDO, CA 91341-1201
PO BOX 1202, SAN FERNANDO, CA 91341-1202
PO BOX 1203, SAN FERNANDO, CA 91341-1203
PO BOX 1204, SAN FERNANDO, CA 91341-1204
PO BOX 1205, SAN FERNANDO, CA 91341-1205
PO BOX 1206, SAN FERNANDO, CA 91341-1206
PO BOX 1207, SAN FERNANDO, CA 91341-1207
PO BOX 1208, SAN FERNANDO, CA 91341-1208
PO BOX 1209, SAN FERNANDO, CA 91341-1209
PO BOX 1210, SAN FERNANDO, CA 91341-1210
PO BOX 1211, SAN FERNANDO, CA 91341-1211
PO BOX 1212, SAN FERNANDO, CA 91341-1212
PO BOX 1213, SAN FERNANDO, CA 91341-1213
PO BOX 1214, SAN FERNANDO, CA 91341-1214
PO BOX 1215, SAN FERNANDO, CA 91341-1215
PO BOX 1216, SAN FERNANDO, CA 91341-1216
PO BOX 1217, SAN FERNANDO, CA 91341-1217
PO BOX 1218, SAN FERNANDO, CA 91341-1218
PO BOX 1219, SAN FERNANDO, CA 91341-1219
PO BOX 1220, SAN FERNANDO, CA 91341-1220
PO BOX 1221, SAN FERNANDO, CA 91341-1221
PO BOX 1222, SAN FERNANDO, CA 91341-1222
PO BOX 1223, SAN FERNANDO, CA 91341-1223
PO BOX 1224, SAN FERNANDO, CA 91341-1224
PO BOX 1225, SAN FERNANDO, CA 91341-1225
PO BOX 1226, SAN FERNANDO, CA 91341-1226
PO BOX 1227, SAN FERNANDO, CA 91341-1227
PO BOX 1228, SAN FERNANDO, CA 91341-1228
PO BOX 1229, SAN FERNANDO, CA 91341-1229
PO BOX 1230, SAN FERNANDO, CA 91341-1230
PO BOX 1231, SAN FERNANDO, CA 91341-1231
PO BOX 1232, SAN FERNANDO, CA 91341-1232
PO BOX 1233, SAN FERNANDO, CA 91341-1233
PO BOX 1234, SAN FERNANDO, CA 91341-1234
PO BOX 1235, SAN FERNANDO, CA 91341-1235
PO BOX 1236, SAN FERNANDO, CA 91341-1236
PO BOX 1237, SAN FERNANDO, CA 91341-1237
PO BOX 1238, SAN FERNANDO, CA 91341-1238
PO BOX 1239, SAN FERNANDO, CA 91341-1239
PO BOX 1240, SAN FERNANDO, CA 91341-1240
PO BOX 1241, SAN FERNANDO, CA 91341-1241
PO BOX 1242, SAN FERNANDO, CA 91341-1242
PO BOX 1243, SAN FERNANDO, CA 91341-1243
PO BOX 1244, SAN FERNANDO, CA 91341-1244
PO BOX 1245, SAN FERNANDO, CA 91341-1245
PO BOX 1246, SAN FERNANDO, CA 91341-1246
PO BOX 1247, SAN FERNANDO, CA 91341-1247
PO BOX 1248, SAN FERNANDO, CA 91341-1248
PO BOX 1249, SAN FERNANDO, CA 91341-1249
PO BOX 1250, SAN FERNANDO, CA 91341-1250
PO BOX 1251, SAN FERNANDO, CA 91341-1251
PO BOX 1252, SAN FERNANDO, CA 91341-1252
PO BOX 1253, SAN FERNANDO, CA 91341-1253
PO BOX 1254, SAN FERNANDO, CA 91341-1254
PO BOX 1255, SAN FERNANDO, CA 91341-1255
PO BOX 1256, SAN FERNANDO, CA 91341-1256
PO BOX 1257, SAN FERNANDO, CA 91341-1257
PO BOX 1258, SAN FERNANDO, CA 91341-1258
PO BOX 1259, SAN FERNANDO, CA 91341-1259
PO BOX 1260, SAN FERNANDO, CA 91341-1260
PO BOX 1261, SAN FERNANDO, CA 91341-1261
PO BOX 1262, SAN FERNANDO, CA 91341-1262
PO BOX 1263, SAN FERNANDO, CA 91341-1263
PO BOX 1264, SAN FERNANDO, CA 91341-1264
PO BOX 1265, SAN FERNANDO, CA 91341-1265
PO BOX 1266, SAN FERNANDO, CA 91341-1266
PO BOX 1267, SAN FERNANDO, CA 91341-1267
PO BOX 1268, SAN FERNANDO, CA 91341-1268
PO BOX 1269, SAN FERNANDO, CA 91341-1269
PO BOX 1270, SAN FERNANDO, CA 91341-1270
PO BOX 1271, SAN FERNANDO, CA 91341-1271
PO BOX 1272, SAN FERNANDO, CA 91341-1272
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