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 1141, SPARTANBURG, SC 29304-1141
PO BOX 1142, SPARTANBURG, SC 29304-1142
PO BOX 1143, SPARTANBURG, SC 29304-1143
PO BOX 1144, SPARTANBURG, SC 29304-1144
PO BOX 1145, SPARTANBURG, SC 29304-1145
PO BOX 1146, SPARTANBURG, SC 29304-1146
PO BOX 1147, SPARTANBURG, SC 29304-1147
PO BOX 1148, SPARTANBURG, SC 29304-1148
PO BOX 1149, SPARTANBURG, SC 29304-1149
PO BOX 1150, SPARTANBURG, SC 29304-1150
PO BOX 1151, SPARTANBURG, SC 29304-1151
PO BOX 1152, SPARTANBURG, SC 29304-1152
PO BOX 1153, SPARTANBURG, SC 29304-1153
PO BOX 1154, SPARTANBURG, SC 29304-1154
PO BOX 1155, SPARTANBURG, SC 29304-1155
PO BOX 1156, SPARTANBURG, SC 29304-1156
PO BOX 1157, SPARTANBURG, SC 29304-1157
PO BOX 1158, SPARTANBURG, SC 29304-1158
PO BOX 1159, SPARTANBURG, SC 29304-1159
PO BOX 1160, SPARTANBURG, SC 29304-1160
PO BOX 1161, SPARTANBURG, SC 29304-1161
PO BOX 1162, SPARTANBURG, SC 29304-1162
PO BOX 1163, SPARTANBURG, SC 29304-1163
PO BOX 1164, SPARTANBURG, SC 29304-1164
PO BOX 1165, SPARTANBURG, SC 29304-1165
PO BOX 1166, SPARTANBURG, SC 29304-1166
PO BOX 1167, SPARTANBURG, SC 29304-1167
PO BOX 1168, SPARTANBURG, SC 29304-1168
PO BOX 1169, SPARTANBURG, SC 29304-1169
PO BOX 1170, SPARTANBURG, SC 29304-1170
PO BOX 1171, SPARTANBURG, SC 29304-1171
PO BOX 1172, SPARTANBURG, SC 29304-1172
PO BOX 1173, SPARTANBURG, SC 29304-1173
PO BOX 1174, SPARTANBURG, SC 29304-1174
PO BOX 1175, SPARTANBURG, SC 29304-1175
PO BOX 1176, SPARTANBURG, SC 29304-1176
PO BOX 1177, SPARTANBURG, SC 29304-1177
PO BOX 1178, SPARTANBURG, SC 29304-1178
PO BOX 1179, SPARTANBURG, SC 29304-1179
PO BOX 1180, SPARTANBURG, SC 29304-1180
PO BOX 1181, SPARTANBURG, SC 29304-1181
PO BOX 1182, SPARTANBURG, SC 29304-1182
PO BOX 1183, SPARTANBURG, SC 29304-1183
PO BOX 1184, SPARTANBURG, SC 29304-1184
PO BOX 1185, SPARTANBURG, SC 29304-1185
PO BOX 1186, SPARTANBURG, SC 29304-1186
PO BOX 1187, SPARTANBURG, SC 29304-1187
PO BOX 1188, SPARTANBURG, SC 29304-1188
PO BOX 1189, SPARTANBURG, SC 29304-1189
PO BOX 1190, SPARTANBURG, SC 29304-1190
PO BOX 1191, SPARTANBURG, SC 29304-1191
PO BOX 1192, SPARTANBURG, SC 29304-1192
PO BOX 1193, SPARTANBURG, SC 29304-1193
PO BOX 1194, SPARTANBURG, SC 29304-1194
PO BOX 1195, SPARTANBURG, SC 29304-1195
PO BOX 1196, SPARTANBURG, SC 29304-1196
PO BOX 1197, SPARTANBURG, SC 29304-1197
PO BOX 1198, SPARTANBURG, SC 29304-1198
PO BOX 1199, SPARTANBURG, SC 29304-1199
PO BOX 1200, SPARTANBURG, SC 29304-1200
PO BOX 1201, SPARTANBURG, SC 29304-1201
PO BOX 1202, SPARTANBURG, SC 29304-1202
PO BOX 1203, SPARTANBURG, SC 29304-1203
PO BOX 1204, SPARTANBURG, SC 29304-1204
PO BOX 1205, SPARTANBURG, SC 29304-1205
PO BOX 1206, SPARTANBURG, SC 29304-1206
PO BOX 1207, SPARTANBURG, SC 29304-1207
PO BOX 1208, SPARTANBURG, SC 29304-1208
PO BOX 1209, SPARTANBURG, SC 29304-1209
PO BOX 1210, SPARTANBURG, SC 29304-1210
PO BOX 1211, SPARTANBURG, SC 29304-1211
PO BOX 1212, SPARTANBURG, SC 29304-1212
PO BOX 1213, SPARTANBURG, SC 29304-1213
PO BOX 1214, SPARTANBURG, SC 29304-1214
PO BOX 1215, SPARTANBURG, SC 29304-1215
PO BOX 1216, SPARTANBURG, SC 29304-1216
PO BOX 1217, SPARTANBURG, SC 29304-1217
PO BOX 1218, SPARTANBURG, SC 29304-1218
PO BOX 1219, SPARTANBURG, SC 29304-1219
PO BOX 1220, SPARTANBURG, SC 29304-1220
PO BOX 1221, SPARTANBURG, SC 29304-1221
PO BOX 1222, SPARTANBURG, SC 29304-1222
PO BOX 1223, SPARTANBURG, SC 29304-1223
PO BOX 1224, SPARTANBURG, SC 29304-1224
PO BOX 1225, SPARTANBURG, SC 29304-1225
PO BOX 1226, SPARTANBURG, SC 29304-1226
PO BOX 1227, SPARTANBURG, SC 29304-1227
PO BOX 1228, SPARTANBURG, SC 29304-1228
PO BOX 1229, SPARTANBURG, SC 29304-1229
PO BOX 1230, SPARTANBURG, SC 29304-1230
PO BOX 1231, SPARTANBURG, SC 29304-1231
PO BOX 1232, SPARTANBURG, SC 29304-1232
PO BOX 1233, SPARTANBURG, SC 29304-1233
PO BOX 1234, SPARTANBURG, SC 29304-1234
PO BOX 1235, SPARTANBURG, SC 29304-1235
PO BOX 1236, SPARTANBURG, SC 29304-1236
PO BOX 1237, SPARTANBURG, SC 29304-1237
PO BOX 1238, SPARTANBURG, SC 29304-1238
PO BOX 1239, SPARTANBURG, SC 29304-1239
PO BOX 1240, SPARTANBURG, SC 29304-1240
PO BOX 1241, SPARTANBURG, SC 29304-1241
PO BOX 1242, SPARTANBURG, SC 29304-1242
PO BOX 1243, SPARTANBURG, SC 29304-1243
PO BOX 1244, SPARTANBURG, SC 29304-1244
PO BOX 1245, SPARTANBURG, SC 29304-1245
PO BOX 1246, SPARTANBURG, SC 29304-1246
PO BOX 1247, SPARTANBURG, SC 29304-1247
PO BOX 1248, SPARTANBURG, SC 29304-1248
PO BOX 1249, SPARTANBURG, SC 29304-1249
PO BOX 1250, SPARTANBURG, SC 29304-1250
PO BOX 1251, SPARTANBURG, SC 29304-1251
PO BOX 1252, SPARTANBURG, SC 29304-1252
PO BOX 1253, SPARTANBURG, SC 29304-1253
PO BOX 1254, SPARTANBURG, SC 29304-1254
PO BOX 1255, SPARTANBURG, SC 29304-1255
PO BOX 1256, SPARTANBURG, SC 29304-1256
PO BOX 1257, SPARTANBURG, SC 29304-1257
PO BOX 1258, SPARTANBURG, SC 29304-1258
PO BOX 1259, SPARTANBURG, SC 29304-1259
PO BOX 1260, SPARTANBURG, SC 29304-1260
PO BOX 1261, SPARTANBURG, SC 29304-1261
PO BOX 1262, SPARTANBURG, SC 29304-1262
PO BOX 1263, SPARTANBURG, SC 29304-1263
PO BOX 1264, SPARTANBURG, SC 29304-1264
PO BOX 1265, SPARTANBURG, SC 29304-1265
PO BOX 1266, SPARTANBURG, SC 29304-1266
PO BOX 1267, SPARTANBURG, SC 29304-1267
PO BOX 1268, SPARTANBURG, SC 29304-1268
PO BOX 1269, SPARTANBURG, SC 29304-1269
PO BOX 1270, SPARTANBURG, SC 29304-1270
PO BOX 1271, SPARTANBURG, SC 29304-1271
PO BOX 1272, SPARTANBURG, SC 29304-1272
PO BOX 1273, SPARTANBURG, SC 29304-1273
PO BOX 1274, SPARTANBURG, SC 29304-1274
PO BOX 1275, SPARTANBURG, SC 29304-1275
PO BOX 1276, SPARTANBURG, SC 29304-1276
PO BOX 1277, SPARTANBURG, SC 29304-1277
PO BOX 1278, SPARTANBURG, SC 29304-1278
PO BOX 1279, SPARTANBURG, SC 29304-1279
PO BOX 1280, SPARTANBURG, SC 29304-1280
PO BOX 1281, SPARTANBURG, SC 29304-1281
PO BOX 1282, SPARTANBURG, SC 29304-1282
PO BOX 1283, SPARTANBURG, SC 29304-1283
PO BOX 1284, SPARTANBURG, SC 29304-1284
PO BOX 1285, SPARTANBURG, SC 29304-1285
PO BOX 1286, SPARTANBURG, SC 29304-1286
PO BOX 1287, SPARTANBURG, SC 29304-1287
PO BOX 1288, SPARTANBURG, SC 29304-1288
PO BOX 1289, SPARTANBURG, SC 29304-1289
PO BOX 1290, SPARTANBURG, SC 29304-1290
PO BOX 1291, SPARTANBURG, SC 29304-1291
PO BOX 1292, SPARTANBURG, SC 29304-1292
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