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 1321, ROCKINGHAM, NC 28380-1321
PO BOX 1322, ROCKINGHAM, NC 28380-1322
PO BOX 1323, ROCKINGHAM, NC 28380-1323
PO BOX 1324, ROCKINGHAM, NC 28380-1324
PO BOX 1325, ROCKINGHAM, NC 28380-1325
PO BOX 1326, ROCKINGHAM, NC 28380-1326
PO BOX 1327, ROCKINGHAM, NC 28380-1327
PO BOX 1328, ROCKINGHAM, NC 28380-1328
PO BOX 1329, ROCKINGHAM, NC 28380-1329
PO BOX 1330, ROCKINGHAM, NC 28380-1330
PO BOX 1331, ROCKINGHAM, NC 28380-1331
PO BOX 1332, ROCKINGHAM, NC 28380-1332
PO BOX 1333, ROCKINGHAM, NC 28380-1333
PO BOX 1334, ROCKINGHAM, NC 28380-1334
PO BOX 1335, ROCKINGHAM, NC 28380-1335
PO BOX 1336, ROCKINGHAM, NC 28380-1336
PO BOX 1337, ROCKINGHAM, NC 28380-1337
PO BOX 1338, ROCKINGHAM, NC 28380-1338
PO BOX 1339, ROCKINGHAM, NC 28380-1339
PO BOX 1340, ROCKINGHAM, NC 28380-1340
PO BOX 1341, ROCKINGHAM, NC 28380-1341
PO BOX 1342, ROCKINGHAM, NC 28380-1342
PO BOX 1343, ROCKINGHAM, NC 28380-1343
PO BOX 1344, ROCKINGHAM, NC 28380-1344
PO BOX 1345, ROCKINGHAM, NC 28380-1345
PO BOX 1346, ROCKINGHAM, NC 28380-1346
PO BOX 1347, ROCKINGHAM, NC 28380-1347
PO BOX 1348, ROCKINGHAM, NC 28380-1348
PO BOX 1349, ROCKINGHAM, NC 28380-1349
PO BOX 1350, ROCKINGHAM, NC 28380-1350
PO BOX 1351, ROCKINGHAM, NC 28380-1351
PO BOX 1352, ROCKINGHAM, NC 28380-1352
PO BOX 1353, ROCKINGHAM, NC 28380-1353
PO BOX 1354, ROCKINGHAM, NC 28380-1354
PO BOX 1355, ROCKINGHAM, NC 28380-1355
PO BOX 1356, ROCKINGHAM, NC 28380-1356
PO BOX 1357, ROCKINGHAM, NC 28380-1357
PO BOX 1358, ROCKINGHAM, NC 28380-1358
PO BOX 1359, ROCKINGHAM, NC 28380-1359
PO BOX 1360, ROCKINGHAM, NC 28380-1360
PO BOX 1361, ROCKINGHAM, NC 28380-1361
PO BOX 1362, ROCKINGHAM, NC 28380-1362
PO BOX 1363, ROCKINGHAM, NC 28380-1363
PO BOX 1364, ROCKINGHAM, NC 28380-1364
PO BOX 1365, ROCKINGHAM, NC 28380-1365
PO BOX 1366, ROCKINGHAM, NC 28380-1366
PO BOX 1367, ROCKINGHAM, NC 28380-1367
PO BOX 1368, ROCKINGHAM, NC 28380-1368
PO BOX 1369, ROCKINGHAM, NC 28380-1369
PO BOX 1370, ROCKINGHAM, NC 28380-1370
PO BOX 1371, ROCKINGHAM, NC 28380-1371
PO BOX 1372, ROCKINGHAM, NC 28380-1372
PO BOX 1373, ROCKINGHAM, NC 28380-1373
PO BOX 1374, ROCKINGHAM, NC 28380-1374
PO BOX 1375, ROCKINGHAM, NC 28380-1375
PO BOX 1376, ROCKINGHAM, NC 28380-1376
PO BOX 1377, ROCKINGHAM, NC 28380-1377
PO BOX 1378, ROCKINGHAM, NC 28380-1378
PO BOX 1379, ROCKINGHAM, NC 28380-1379
PO BOX 1380, ROCKINGHAM, NC 28380-1380
PO BOX 1381, ROCKINGHAM, NC 28380-1381
PO BOX 1382, ROCKINGHAM, NC 28380-1382
PO BOX 1383, ROCKINGHAM, NC 28380-1383
PO BOX 1384, ROCKINGHAM, NC 28380-1384
PO BOX 1385, ROCKINGHAM, NC 28380-1385
PO BOX 1386, ROCKINGHAM, NC 28380-1386
PO BOX 1387, ROCKINGHAM, NC 28380-1387
PO BOX 1388, ROCKINGHAM, NC 28380-1388
PO BOX 1389, ROCKINGHAM, NC 28380-1389
PO BOX 1390, ROCKINGHAM, NC 28380-1390
PO BOX 1391, ROCKINGHAM, NC 28380-1391
PO BOX 1392, ROCKINGHAM, NC 28380-1392
PO BOX 1393, ROCKINGHAM, NC 28380-1393
PO BOX 1394, ROCKINGHAM, NC 28380-1394
PO BOX 1395, ROCKINGHAM, NC 28380-1395
PO BOX 1396, ROCKINGHAM, NC 28380-1396
PO BOX 1397, ROCKINGHAM, NC 28380-1397
PO BOX 1398, ROCKINGHAM, NC 28380-1398
PO BOX 1399, ROCKINGHAM, NC 28380-1399
PO BOX 1400, ROCKINGHAM, NC 28380-1400
PO BOX 1401, ROCKINGHAM, NC 28380-1401
PO BOX 1402, ROCKINGHAM, NC 28380-1402
PO BOX 1403, ROCKINGHAM, NC 28380-1403
PO BOX 1404, ROCKINGHAM, NC 28380-1404
PO BOX 1405, ROCKINGHAM, NC 28380-1405
PO BOX 1406, ROCKINGHAM, NC 28380-1406
PO BOX 1407, ROCKINGHAM, NC 28380-1407
PO BOX 1408, ROCKINGHAM, NC 28380-1408
PO BOX 1409, ROCKINGHAM, NC 28380-1409
PO BOX 1410, ROCKINGHAM, NC 28380-1410
PO BOX 1411, ROCKINGHAM, NC 28380-1411
PO BOX 1412, ROCKINGHAM, NC 28380-1412
PO BOX 1413, ROCKINGHAM, NC 28380-1413
PO BOX 1414, ROCKINGHAM, NC 28380-1414
PO BOX 1415, ROCKINGHAM, NC 28380-1415
PO BOX 1416, ROCKINGHAM, NC 28380-1416
PO BOX 1417, ROCKINGHAM, NC 28380-1417
PO BOX 1418, ROCKINGHAM, NC 28380-1418
PO BOX 1419, ROCKINGHAM, NC 28380-1419
PO BOX 1420, ROCKINGHAM, NC 28380-1420
PO BOX 1421, ROCKINGHAM, NC 28380-1421
PO BOX 1422, ROCKINGHAM, NC 28380-1422
PO BOX 1423, ROCKINGHAM, NC 28380-1423
PO BOX 1424, ROCKINGHAM, NC 28380-1424
PO BOX 1425, ROCKINGHAM, NC 28380-1425
PO BOX 1426, ROCKINGHAM, NC 28380-1426
PO BOX 1427, ROCKINGHAM, NC 28380-1427
PO BOX 1428, ROCKINGHAM, NC 28380-1428
PO BOX 1429, ROCKINGHAM, NC 28380-1429
PO BOX 1430, ROCKINGHAM, NC 28380-1430
PO BOX 1431, ROCKINGHAM, NC 28380-1431
PO BOX 1432, ROCKINGHAM, NC 28380-1432
PO BOX 1433, ROCKINGHAM, NC 28380-1433
PO BOX 1434, ROCKINGHAM, NC 28380-1434
PO BOX 1435, ROCKINGHAM, NC 28380-1435
PO BOX 1436, ROCKINGHAM, NC 28380-1436
PO BOX 1437, ROCKINGHAM, NC 28380-1437
PO BOX 1438, ROCKINGHAM, NC 28380-1438
PO BOX 1439, ROCKINGHAM, NC 28380-1439
PO BOX 1440, ROCKINGHAM, NC 28380-1440
PO BOX 1441, ROCKINGHAM, NC 28380-1441
PO BOX 1442, ROCKINGHAM, NC 28380-1442
PO BOX 1443, ROCKINGHAM, NC 28380-1443
PO BOX 1444, ROCKINGHAM, NC 28380-1444
PO BOX 1445, ROCKINGHAM, NC 28380-1445
PO BOX 1446, ROCKINGHAM, NC 28380-1446
PO BOX 1447, ROCKINGHAM, NC 28380-1447
PO BOX 1448, ROCKINGHAM, NC 28380-1448
PO BOX 1449, ROCKINGHAM, NC 28380-1449
PO BOX 1450, ROCKINGHAM, NC 28380-1450
PO BOX 1451, ROCKINGHAM, NC 28380-1451
PO BOX 1452, ROCKINGHAM, NC 28380-1452
PO BOX 1453, ROCKINGHAM, NC 28380-1453
PO BOX 1454, ROCKINGHAM, NC 28380-1454
PO BOX 1455, ROCKINGHAM, NC 28380-1455
PO BOX 1456, ROCKINGHAM, NC 28380-1456
PO BOX 1457, ROCKINGHAM, NC 28380-1457
PO BOX 1458, ROCKINGHAM, NC 28380-1458
PO BOX 1459, ROCKINGHAM, NC 28380-1459
PO BOX 1460, ROCKINGHAM, NC 28380-1460
PO BOX 1461, ROCKINGHAM, NC 28380-1461
PO BOX 1462, ROCKINGHAM, NC 28380-1462
PO BOX 1463, ROCKINGHAM, NC 28380-1463
PO BOX 1464, ROCKINGHAM, NC 28380-1464
PO BOX 1465, ROCKINGHAM, NC 28380-1465
PO BOX 1466, ROCKINGHAM, NC 28380-1466
PO BOX 1467, ROCKINGHAM, NC 28380-1467
PO BOX 1468, ROCKINGHAM, NC 28380-1468
PO BOX 1469, ROCKINGHAM, NC 28380-1469
PO BOX 1470, ROCKINGHAM, NC 28380-1470
PO BOX 1471, ROCKINGHAM, NC 28380-1471
PO BOX 1472, ROCKINGHAM, NC 28380-1472
PO BOX 1473, ROCKINGHAM, NC 28380-1473
PO BOX 1474, ROCKINGHAM, NC 28380-1474
PO BOX 1475, ROCKINGHAM, NC 28380-1475
PO BOX 1476, ROCKINGHAM, NC 28380-1476
PO BOX 1477, ROCKINGHAM, NC 28380-1477
PO BOX 1478, ROCKINGHAM, NC 28380-1478
PO BOX 1479, ROCKINGHAM, NC 28380-1479
PO BOX 1480, ROCKINGHAM, NC 28380-1480
PO BOX 1481, ROCKINGHAM, NC 28380-1481
PO BOX 1482, ROCKINGHAM, NC 28380-1482
PO BOX 1483, ROCKINGHAM, NC 28380-1483
PO BOX 1484, ROCKINGHAM, NC 28380-1484
PO BOX 1485, ROCKINGHAM, NC 28380-1485
PO BOX 1486, ROCKINGHAM, NC 28380-1486
PO BOX 1487, ROCKINGHAM, NC 28380-1487
PO BOX 1488, ROCKINGHAM, NC 28380-1488
PO BOX 1489, ROCKINGHAM, NC 28380-1489
PO BOX 1490, ROCKINGHAM, NC 28380-1490
PO BOX 1491, ROCKINGHAM, NC 28380-1491
PO BOX 1492, ROCKINGHAM, NC 28380-1492
PO BOX 1493, ROCKINGHAM, NC 28380-1493
PO BOX 1494, ROCKINGHAM, NC 28380-1494
PO BOX 1495, ROCKINGHAM, NC 28380-1495
PO BOX 1496, ROCKINGHAM, NC 28380-1496
PO BOX 1497, ROCKINGHAM, NC 28380-1497
PO BOX 1498, ROCKINGHAM, NC 28380-1498
PO BOX 1499, ROCKINGHAM, NC 28380-1499
PO BOX 1500, ROCKINGHAM, NC 28380-1500
PO BOX 1501, ROCKINGHAM, NC 28380-1501
PO BOX 1502, ROCKINGHAM, NC 28380-1502
PO BOX 1503, ROCKINGHAM, NC 28380-1503
PO BOX 1504, ROCKINGHAM, NC 28380-1504
PO BOX 1505, ROCKINGHAM, NC 28380-1505
PO BOX 1506, ROCKINGHAM, NC 28380-1506
PO BOX 1507, ROCKINGHAM, NC 28380-1507
PO BOX 1508, ROCKINGHAM, NC 28380-1508
PO BOX 1509, ROCKINGHAM, NC 28380-1509
PO BOX 1510, ROCKINGHAM, NC 28380-1510
PO BOX 1511, ROCKINGHAM, NC 28380-1511
PO BOX 1512, ROCKINGHAM, NC 28380-1512
PO BOX 1513, ROCKINGHAM, NC 28380-1513
PO BOX 1514, ROCKINGHAM, NC 28380-1514
PO BOX 1515, ROCKINGHAM, NC 28380-1515
PO BOX 1516, ROCKINGHAM, NC 28380-1516
PO BOX 1517, ROCKINGHAM, NC 28380-1517
PO BOX 1518, ROCKINGHAM, NC 28380-1518
PO BOX 1519, ROCKINGHAM, NC 28380-1519
PO BOX 1520, ROCKINGHAM, NC 28380-1520
PO BOX 1521, ROCKINGHAM, NC 28380-1521
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