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, ROUGH AND READY, CA 95975-1121
PO BOX 1122, ROUGH AND READY, CA 95975-1122
PO BOX 1123, ROUGH AND READY, CA 95975-1123
PO BOX 1124, ROUGH AND READY, CA 95975-1124
PO BOX 1125, ROUGH AND READY, CA 95975-1125
PO BOX 1126, ROUGH AND READY, CA 95975-1126
PO BOX 1127, ROUGH AND READY, CA 95975-1127
PO BOX 1128, ROUGH AND READY, CA 95975-1128
PO BOX 1129, ROUGH AND READY, CA 95975-1129
PO BOX 1130, ROUGH AND READY, CA 95975-1130
PO BOX 1131, ROUGH AND READY, CA 95975-1131
PO BOX 1132, ROUGH AND READY, CA 95975-1132
PO BOX 1133, ROUGH AND READY, CA 95975-1133
PO BOX 1134, ROUGH AND READY, CA 95975-1134
PO BOX 1135, ROUGH AND READY, CA 95975-1135
PO BOX 1136, ROUGH AND READY, CA 95975-1136
PO BOX 1137, ROUGH AND READY, CA 95975-1137
PO BOX 1138, ROUGH AND READY, CA 95975-1138
PO BOX 1139, ROUGH AND READY, CA 95975-1139
PO BOX 1140, ROUGH AND READY, CA 95975-1140
PO BOX 1141, ROUGH AND READY, CA 95975-1141
PO BOX 1142, ROUGH AND READY, CA 95975-1142
PO BOX 1143, ROUGH AND READY, CA 95975-1143
PO BOX 1144, ROUGH AND READY, CA 95975-1144
PO BOX 1145, ROUGH AND READY, CA 95975-1145
PO BOX 1146, ROUGH AND READY, CA 95975-1146
PO BOX 1147, ROUGH AND READY, CA 95975-1147
PO BOX 1148, ROUGH AND READY, CA 95975-1148
PO BOX 1149, ROUGH AND READY, CA 95975-1149
PO BOX 1150, ROUGH AND READY, CA 95975-1150
PO BOX 1151, ROUGH AND READY, CA 95975-1151
PO BOX 1152, ROUGH AND READY, CA 95975-1152
PO BOX 1153, ROUGH AND READY, CA 95975-1153
PO BOX 1154, ROUGH AND READY, CA 95975-1154
PO BOX 1155, ROUGH AND READY, CA 95975-1155
PO BOX 1156, ROUGH AND READY, CA 95975-1156
PO BOX 1157, ROUGH AND READY, CA 95975-1157
PO BOX 1158, ROUGH AND READY, CA 95975-1158
PO BOX 1159, ROUGH AND READY, CA 95975-1159
PO BOX 1160, ROUGH AND READY, CA 95975-1160
PO BOX 1161, ROUGH AND READY, CA 95975-1161
PO BOX 1162, ROUGH AND READY, CA 95975-1162
PO BOX 1163, ROUGH AND READY, CA 95975-1163
PO BOX 1164, ROUGH AND READY, CA 95975-1164
PO BOX 1165, ROUGH AND READY, CA 95975-1165
PO BOX 1166, ROUGH AND READY, CA 95975-1166
PO BOX 1167, ROUGH AND READY, CA 95975-1167
PO BOX 1168, ROUGH AND READY, CA 95975-1168
PO BOX 1169, ROUGH AND READY, CA 95975-1169
PO BOX 1170, ROUGH AND READY, CA 95975-1170
PO BOX 1171, ROUGH AND READY, CA 95975-1171
PO BOX 1172, ROUGH AND READY, CA 95975-1172
PO BOX 1173, ROUGH AND READY, CA 95975-1173
PO BOX 1174, ROUGH AND READY, CA 95975-1174
PO BOX 1175, ROUGH AND READY, CA 95975-1175
PO BOX 1176, ROUGH AND READY, CA 95975-1176
PO BOX 1177, ROUGH AND READY, CA 95975-1177
PO BOX 1178, ROUGH AND READY, CA 95975-1178
PO BOX 1179, ROUGH AND READY, CA 95975-1179
PO BOX 1180, ROUGH AND READY, CA 95975-1180
PO BOX 1181, ROUGH AND READY, CA 95975-1181
PO BOX 1182, ROUGH AND READY, CA 95975-1182
PO BOX 1183, ROUGH AND READY, CA 95975-1183
PO BOX 1184, ROUGH AND READY, CA 95975-1184
PO BOX 1185, ROUGH AND READY, CA 95975-1185
PO BOX 1186, ROUGH AND READY, CA 95975-1186
PO BOX 1187, ROUGH AND READY, CA 95975-1187
PO BOX 1188, ROUGH AND READY, CA 95975-1188
PO BOX 1189, ROUGH AND READY, CA 95975-1189
PO BOX 1190, ROUGH AND READY, CA 95975-1190
PO BOX 1191, ROUGH AND READY, CA 95975-1191
PO BOX 1192, ROUGH AND READY, CA 95975-1192
PO BOX 1193, ROUGH AND READY, CA 95975-1193
PO BOX 1194, ROUGH AND READY, CA 95975-1194
PO BOX 1195, ROUGH AND READY, CA 95975-1195
PO BOX 1196, ROUGH AND READY, CA 95975-1196
PO BOX 1197, ROUGH AND READY, CA 95975-1197
PO BOX 1198, ROUGH AND READY, CA 95975-1198
PO BOX 1199, ROUGH AND READY, CA 95975-1199
PO BOX 1200, ROUGH AND READY, CA 95975-1200
PO BOX 1201, ROUGH AND READY, CA 95975-1201
PO BOX 1202, ROUGH AND READY, CA 95975-1202
PO BOX 1203, ROUGH AND READY, CA 95975-1203
PO BOX 1204, ROUGH AND READY, CA 95975-1204
PO BOX 1205, ROUGH AND READY, CA 95975-1205
PO BOX 1206, ROUGH AND READY, CA 95975-1206
PO BOX 1207, ROUGH AND READY, CA 95975-1207
PO BOX 1208, ROUGH AND READY, CA 95975-1208
PO BOX 1209, ROUGH AND READY, CA 95975-1209
PO BOX 1210, ROUGH AND READY, CA 95975-1210
PO BOX 1211, ROUGH AND READY, CA 95975-1211
PO BOX 1212, ROUGH AND READY, CA 95975-1212
PO BOX 1213, ROUGH AND READY, CA 95975-1213
PO BOX 1214, ROUGH AND READY, CA 95975-1214
PO BOX 1215, ROUGH AND READY, CA 95975-1215
PO BOX 1216, ROUGH AND READY, CA 95975-1216
PO BOX 1217, ROUGH AND READY, CA 95975-1217
PO BOX 1218, ROUGH AND READY, CA 95975-1218
PO BOX 1219, ROUGH AND READY, CA 95975-1219
PO BOX 1220, ROUGH AND READY, CA 95975-1220
PO BOX 1221, ROUGH AND READY, CA 95975-1221
PO BOX 1222, ROUGH AND READY, CA 95975-1222
PO BOX 1223, ROUGH AND READY, CA 95975-1223
PO BOX 1224, ROUGH AND READY, CA 95975-1224
PO BOX 1225, ROUGH AND READY, CA 95975-1225
PO BOX 1226, ROUGH AND READY, CA 95975-1226
PO BOX 1227, ROUGH AND READY, CA 95975-1227
PO BOX 1228, ROUGH AND READY, CA 95975-1228
PO BOX 1229, ROUGH AND READY, CA 95975-1229
PO BOX 1230, ROUGH AND READY, CA 95975-1230
PO BOX 1231, ROUGH AND READY, CA 95975-1231
PO BOX 1232, ROUGH AND READY, CA 95975-1232
PO BOX 1233, ROUGH AND READY, CA 95975-1233
PO BOX 1234, ROUGH AND READY, CA 95975-1234
PO BOX 1235, ROUGH AND READY, CA 95975-1235
PO BOX 1236, ROUGH AND READY, CA 95975-1236
PO BOX 1237, ROUGH AND READY, CA 95975-1237
PO BOX 1238, ROUGH AND READY, CA 95975-1238
PO BOX 1239, ROUGH AND READY, CA 95975-1239
PO BOX 1240, ROUGH AND READY, CA 95975-1240
PO BOX 1241, ROUGH AND READY, CA 95975-1241
PO BOX 1242, ROUGH AND READY, CA 95975-1242
PO BOX 1243, ROUGH AND READY, CA 95975-1243
PO BOX 1244, ROUGH AND READY, CA 95975-1244
PO BOX 1245, ROUGH AND READY, CA 95975-1245
PO BOX 1246, ROUGH AND READY, CA 95975-1246
PO BOX 1247, ROUGH AND READY, CA 95975-1247
PO BOX 1248, ROUGH AND READY, CA 95975-1248
PO BOX 1249, ROUGH AND READY, CA 95975-1249
PO BOX 1250, ROUGH AND READY, CA 95975-1250
PO BOX 1251, ROUGH AND READY, CA 95975-1251
PO BOX 1252, ROUGH AND READY, CA 95975-1252
PO BOX 1253, ROUGH AND READY, CA 95975-1253
PO BOX 1254, ROUGH AND READY, CA 95975-1254
PO BOX 1255, ROUGH AND READY, CA 95975-1255
PO BOX 1256, ROUGH AND READY, CA 95975-1256
PO BOX 1257, ROUGH AND READY, CA 95975-1257
PO BOX 1258, ROUGH AND READY, CA 95975-1258
PO BOX 1259, ROUGH AND READY, CA 95975-1259
PO BOX 1260, ROUGH AND READY, CA 95975-1260
PO BOX 1261, ROUGH AND READY, CA 95975-1261
PO BOX 1262, ROUGH AND READY, CA 95975-1262
PO BOX 1263, ROUGH AND READY, CA 95975-1263
PO BOX 1264, ROUGH AND READY, CA 95975-1264
PO BOX 1265, ROUGH AND READY, CA 95975-1265
PO BOX 1266, ROUGH AND READY, CA 95975-1266
PO BOX 1267, ROUGH AND READY, CA 95975-1267
PO BOX 1268, ROUGH AND READY, CA 95975-1268
PO BOX 1269, ROUGH AND READY, CA 95975-1269
PO BOX 1270, ROUGH AND READY, CA 95975-1270
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