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 1301, SPARTANBURG, SC 29304-1301
PO BOX 1302, SPARTANBURG, SC 29304-1302
PO BOX 1303, SPARTANBURG, SC 29304-1303
PO BOX 1304, SPARTANBURG, SC 29304-1304
PO BOX 1305, SPARTANBURG, SC 29304-1305
PO BOX 1306, SPARTANBURG, SC 29304-1306
PO BOX 1307, SPARTANBURG, SC 29304-1307
PO BOX 1308, SPARTANBURG, SC 29304-1308
PO BOX 1309, SPARTANBURG, SC 29304-1309
PO BOX 1310, SPARTANBURG, SC 29304-1310
PO BOX 1311, SPARTANBURG, SC 29304-1311
PO BOX 1312, SPARTANBURG, SC 29304-1312
PO BOX 1313, SPARTANBURG, SC 29304-1313
PO BOX 1314, SPARTANBURG, SC 29304-1314
PO BOX 1315, SPARTANBURG, SC 29304-1315
PO BOX 1316, SPARTANBURG, SC 29304-1316
PO BOX 1317, SPARTANBURG, SC 29304-1317
PO BOX 1318, SPARTANBURG, SC 29304-1318
PO BOX 1319, SPARTANBURG, SC 29304-1319
PO BOX 1320, SPARTANBURG, SC 29304-1320
PO BOX 1321, SPARTANBURG, SC 29304-1321
PO BOX 1322, SPARTANBURG, SC 29304-1322
PO BOX 1323, SPARTANBURG, SC 29304-1323
PO BOX 1324, SPARTANBURG, SC 29304-1324
PO BOX 1325, SPARTANBURG, SC 29304-1325
PO BOX 1326, SPARTANBURG, SC 29304-1326
PO BOX 1327, SPARTANBURG, SC 29304-1327
PO BOX 1328, SPARTANBURG, SC 29304-1328
PO BOX 1329, SPARTANBURG, SC 29304-1329
PO BOX 1330, SPARTANBURG, SC 29304-1330
PO BOX 1331, SPARTANBURG, SC 29304-1331
PO BOX 1332, SPARTANBURG, SC 29304-1332
PO BOX 1333, SPARTANBURG, SC 29304-1333
PO BOX 1334, SPARTANBURG, SC 29304-1334
PO BOX 1335, SPARTANBURG, SC 29304-1335
PO BOX 1336, SPARTANBURG, SC 29304-1336
PO BOX 1337, SPARTANBURG, SC 29304-1337
PO BOX 1338, SPARTANBURG, SC 29304-1338
PO BOX 1339, SPARTANBURG, SC 29304-1339
PO BOX 1340, SPARTANBURG, SC 29304-1340
PO BOX 1341, SPARTANBURG, SC 29304-1341
PO BOX 1342, SPARTANBURG, SC 29304-1342
PO BOX 1343, SPARTANBURG, SC 29304-1343
PO BOX 1344, SPARTANBURG, SC 29304-1344
PO BOX 1345, SPARTANBURG, SC 29304-1345
PO BOX 1346, SPARTANBURG, SC 29304-1346
PO BOX 1347, SPARTANBURG, SC 29304-1347
PO BOX 1348, SPARTANBURG, SC 29304-1348
PO BOX 1349, SPARTANBURG, SC 29304-1349
PO BOX 1350, SPARTANBURG, SC 29304-1350
PO BOX 1351, SPARTANBURG, SC 29304-1351
PO BOX 1352, SPARTANBURG, SC 29304-1352
PO BOX 1353, SPARTANBURG, SC 29304-1353
PO BOX 1354, SPARTANBURG, SC 29304-1354
PO BOX 1355, SPARTANBURG, SC 29304-1355
PO BOX 1356, SPARTANBURG, SC 29304-1356
PO BOX 1357, SPARTANBURG, SC 29304-1357
PO BOX 1358, SPARTANBURG, SC 29304-1358
PO BOX 1359, SPARTANBURG, SC 29304-1359
PO BOX 1360, SPARTANBURG, SC 29304-1360
PO BOX 1361, SPARTANBURG, SC 29304-1361
PO BOX 1362, SPARTANBURG, SC 29304-1362
PO BOX 1363, SPARTANBURG, SC 29304-1363
PO BOX 1364, SPARTANBURG, SC 29304-1364
PO BOX 1365, SPARTANBURG, SC 29304-1365
PO BOX 1366, SPARTANBURG, SC 29304-1366
PO BOX 1367, SPARTANBURG, SC 29304-1367
PO BOX 1368, SPARTANBURG, SC 29304-1368
PO BOX 1369, SPARTANBURG, SC 29304-1369
PO BOX 1370, SPARTANBURG, SC 29304-1370
PO BOX 1371, SPARTANBURG, SC 29304-1371
PO BOX 1372, SPARTANBURG, SC 29304-1372
PO BOX 1373, SPARTANBURG, SC 29304-1373
PO BOX 1374, SPARTANBURG, SC 29304-1374
PO BOX 1375, SPARTANBURG, SC 29304-1375
PO BOX 1376, SPARTANBURG, SC 29304-1376
PO BOX 1377, SPARTANBURG, SC 29304-1377
PO BOX 1378, SPARTANBURG, SC 29304-1378
PO BOX 1379, SPARTANBURG, SC 29304-1379
PO BOX 1380, SPARTANBURG, SC 29304-1380
PO BOX 1381, SPARTANBURG, SC 29304-1381
PO BOX 1382, SPARTANBURG, SC 29304-1382
PO BOX 1383, SPARTANBURG, SC 29304-1383
PO BOX 1384, SPARTANBURG, SC 29304-1384
PO BOX 1385, SPARTANBURG, SC 29304-1385
PO BOX 1386, SPARTANBURG, SC 29304-1386
PO BOX 1387, SPARTANBURG, SC 29304-1387
PO BOX 1388, SPARTANBURG, SC 29304-1388
PO BOX 1389, SPARTANBURG, SC 29304-1389
PO BOX 1390, SPARTANBURG, SC 29304-1390
PO BOX 1391, SPARTANBURG, SC 29304-1391
PO BOX 1392, SPARTANBURG, SC 29304-1392
PO BOX 1393, SPARTANBURG, SC 29304-1393
PO BOX 1394, SPARTANBURG, SC 29304-1394
PO BOX 1395, SPARTANBURG, SC 29304-1395
PO BOX 1396, SPARTANBURG, SC 29304-1396
PO BOX 1397, SPARTANBURG, SC 29304-1397
PO BOX 1398, SPARTANBURG, SC 29304-1398
PO BOX 1399, SPARTANBURG, SC 29304-1399
PO BOX 1400, SPARTANBURG, SC 29304-1400
PO BOX 1401, SPARTANBURG, SC 29304-1401
PO BOX 1402, SPARTANBURG, SC 29304-1402
PO BOX 1403, SPARTANBURG, SC 29304-1403
PO BOX 1404, SPARTANBURG, SC 29304-1404
PO BOX 1405, SPARTANBURG, SC 29304-1405
PO BOX 1406, SPARTANBURG, SC 29304-1406
PO BOX 1407, SPARTANBURG, SC 29304-1407
PO BOX 1408, SPARTANBURG, SC 29304-1408
PO BOX 1409, SPARTANBURG, SC 29304-1409
PO BOX 1410, SPARTANBURG, SC 29304-1410
PO BOX 1411, SPARTANBURG, SC 29304-1411
PO BOX 1412, SPARTANBURG, SC 29304-1412
PO BOX 1413, SPARTANBURG, SC 29304-1413
PO BOX 1414, SPARTANBURG, SC 29304-1414
PO BOX 1415, SPARTANBURG, SC 29304-1415
PO BOX 1416, SPARTANBURG, SC 29304-1416
PO BOX 1417, SPARTANBURG, SC 29304-1417
PO BOX 1418, SPARTANBURG, SC 29304-1418
PO BOX 1419, SPARTANBURG, SC 29304-1419
PO BOX 1420, SPARTANBURG, SC 29304-1420
PO BOX 1421, SPARTANBURG, SC 29304-1421
PO BOX 1422, SPARTANBURG, SC 29304-1422
PO BOX 1423, SPARTANBURG, SC 29304-1423
PO BOX 1424, SPARTANBURG, SC 29304-1424
PO BOX 1425, SPARTANBURG, SC 29304-1425
PO BOX 1426, SPARTANBURG, SC 29304-1426
PO BOX 1427, SPARTANBURG, SC 29304-1427
PO BOX 1428, SPARTANBURG, SC 29304-1428
PO BOX 1429, SPARTANBURG, SC 29304-1429
PO BOX 1430, SPARTANBURG, SC 29304-1430
PO BOX 1431, SPARTANBURG, SC 29304-1431
PO BOX 1432, SPARTANBURG, SC 29304-1432
PO BOX 1433, SPARTANBURG, SC 29304-1433
PO BOX 1434, SPARTANBURG, SC 29304-1434
PO BOX 1435, SPARTANBURG, SC 29304-1435
PO BOX 1436, SPARTANBURG, SC 29304-1436
PO BOX 1437, SPARTANBURG, SC 29304-1437
PO BOX 1438, SPARTANBURG, SC 29304-1438
PO BOX 1439, SPARTANBURG, SC 29304-1439
PO BOX 1440, SPARTANBURG, SC 29304-1440
PO BOX 1441, SPARTANBURG, SC 29304-1441
PO BOX 1442, SPARTANBURG, SC 29304-1442
PO BOX 1443, SPARTANBURG, SC 29304-1443
PO BOX 1444, SPARTANBURG, SC 29304-1444
PO BOX 1445, SPARTANBURG, SC 29304-1445
PO BOX 1446, SPARTANBURG, SC 29304-1446
PO BOX 1447, SPARTANBURG, SC 29304-1447
PO BOX 1448, SPARTANBURG, SC 29304-1448
PO BOX 1449, SPARTANBURG, SC 29304-1449
PO BOX 1450, SPARTANBURG, SC 29304-1450
PO BOX 1451, SPARTANBURG, SC 29304-1451
PO BOX 1452, SPARTANBURG, SC 29304-1452
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