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 1341, SOUTH LANCASTER, MA 01561-1341
PO BOX 1342, SOUTH LANCASTER, MA 01561-1342
PO BOX 1343, SOUTH LANCASTER, MA 01561-1343
PO BOX 1344, SOUTH LANCASTER, MA 01561-1344
PO BOX 1345, SOUTH LANCASTER, MA 01561-1345
PO BOX 1346, SOUTH LANCASTER, MA 01561-1346
PO BOX 1347, SOUTH LANCASTER, MA 01561-1347
PO BOX 1348, SOUTH LANCASTER, MA 01561-1348
PO BOX 1349, SOUTH LANCASTER, MA 01561-1349
PO BOX 1350, SOUTH LANCASTER, MA 01561-1350
PO BOX 1351, SOUTH LANCASTER, MA 01561-1351
PO BOX 1352, SOUTH LANCASTER, MA 01561-1352
PO BOX 1353, SOUTH LANCASTER, MA 01561-1353
PO BOX 1354, SOUTH LANCASTER, MA 01561-1354
PO BOX 1355, SOUTH LANCASTER, MA 01561-1355
PO BOX 1356, SOUTH LANCASTER, MA 01561-1356
PO BOX 1357, SOUTH LANCASTER, MA 01561-1357
PO BOX 1358, SOUTH LANCASTER, MA 01561-1358
PO BOX 1359, SOUTH LANCASTER, MA 01561-1359
PO BOX 1360, SOUTH LANCASTER, MA 01561-1360
PO BOX 1361, SOUTH LANCASTER, MA 01561-1361
PO BOX 1362, SOUTH LANCASTER, MA 01561-1362
PO BOX 1363, SOUTH LANCASTER, MA 01561-1363
PO BOX 1364, SOUTH LANCASTER, MA 01561-1364
PO BOX 1365, SOUTH LANCASTER, MA 01561-1365
PO BOX 1366, SOUTH LANCASTER, MA 01561-1366
PO BOX 1367, SOUTH LANCASTER, MA 01561-1367
PO BOX 1368, SOUTH LANCASTER, MA 01561-1368
PO BOX 1369, SOUTH LANCASTER, MA 01561-1369
PO BOX 1370, SOUTH LANCASTER, MA 01561-1370
PO BOX 1371, SOUTH LANCASTER, MA 01561-1371
PO BOX 1372, SOUTH LANCASTER, MA 01561-1372
PO BOX 1373, SOUTH LANCASTER, MA 01561-1373
PO BOX 1374, SOUTH LANCASTER, MA 01561-1374
PO BOX 1375, SOUTH LANCASTER, MA 01561-1375
PO BOX 1376, SOUTH LANCASTER, MA 01561-1376
PO BOX 1377, SOUTH LANCASTER, MA 01561-1377
PO BOX 1378, SOUTH LANCASTER, MA 01561-1378
PO BOX 1379, SOUTH LANCASTER, MA 01561-1379
PO BOX 1380, SOUTH LANCASTER, MA 01561-1380
PO BOX 1381, SOUTH LANCASTER, MA 01561-1381
PO BOX 1382, SOUTH LANCASTER, MA 01561-1382
PO BOX 1383, SOUTH LANCASTER, MA 01561-1383
PO BOX 1384, SOUTH LANCASTER, MA 01561-1384
PO BOX 1385, SOUTH LANCASTER, MA 01561-1385
PO BOX 1386, SOUTH LANCASTER, MA 01561-1386
PO BOX 1387, SOUTH LANCASTER, MA 01561-1387
PO BOX 1388, SOUTH LANCASTER, MA 01561-1388
PO BOX 1389, SOUTH LANCASTER, MA 01561-1389
PO BOX 1390, SOUTH LANCASTER, MA 01561-1390
PO BOX 1391, SOUTH LANCASTER, MA 01561-1391
PO BOX 1392, SOUTH LANCASTER, MA 01561-1392
PO BOX 1393, SOUTH LANCASTER, MA 01561-1393
PO BOX 1394, SOUTH LANCASTER, MA 01561-1394
PO BOX 1395, SOUTH LANCASTER, MA 01561-1395
PO BOX 1396, SOUTH LANCASTER, MA 01561-1396
PO BOX 1397, SOUTH LANCASTER, MA 01561-1397
PO BOX 1398, SOUTH LANCASTER, MA 01561-1398
PO BOX 1399, SOUTH LANCASTER, MA 01561-1399
PO BOX 1400, SOUTH LANCASTER, MA 01561-1400
PO BOX 1401, SOUTH LANCASTER, MA 01561-1401
PO BOX 1402, SOUTH LANCASTER, MA 01561-1402
PO BOX 1403, SOUTH LANCASTER, MA 01561-1403
PO BOX 1404, SOUTH LANCASTER, MA 01561-1404
PO BOX 1405, SOUTH LANCASTER, MA 01561-1405
PO BOX 1406, SOUTH LANCASTER, MA 01561-1406
PO BOX 1407, SOUTH LANCASTER, MA 01561-1407
PO BOX 1408, SOUTH LANCASTER, MA 01561-1408
PO BOX 1409, SOUTH LANCASTER, MA 01561-1409
PO BOX 1410, SOUTH LANCASTER, MA 01561-1410
PO BOX 1411, SOUTH LANCASTER, MA 01561-1411
PO BOX 1412, SOUTH LANCASTER, MA 01561-1412
PO BOX 1413, SOUTH LANCASTER, MA 01561-1413
PO BOX 1414, SOUTH LANCASTER, MA 01561-1414
PO BOX 1415, SOUTH LANCASTER, MA 01561-1415
PO BOX 1416, SOUTH LANCASTER, MA 01561-1416
PO BOX 1417, SOUTH LANCASTER, MA 01561-1417
PO BOX 1418, SOUTH LANCASTER, MA 01561-1418
PO BOX 1419, SOUTH LANCASTER, MA 01561-1419
PO BOX 1420, SOUTH LANCASTER, MA 01561-1420
PO BOX 1421, SOUTH LANCASTER, MA 01561-1421
PO BOX 1422, SOUTH LANCASTER, MA 01561-1422
PO BOX 1423, SOUTH LANCASTER, MA 01561-1423
PO BOX 1424, SOUTH LANCASTER, MA 01561-1424
PO BOX 1425, SOUTH LANCASTER, MA 01561-1425
PO BOX 1426, SOUTH LANCASTER, MA 01561-1426
PO BOX 1427, SOUTH LANCASTER, MA 01561-1427
PO BOX 1428, SOUTH LANCASTER, MA 01561-1428
PO BOX 1429, SOUTH LANCASTER, MA 01561-1429
PO BOX 1430, SOUTH LANCASTER, MA 01561-1430
PO BOX 1431, SOUTH LANCASTER, MA 01561-1431
PO BOX 1432, SOUTH LANCASTER, MA 01561-1432
PO BOX 1433, SOUTH LANCASTER, MA 01561-1433
PO BOX 1434, SOUTH LANCASTER, MA 01561-1434
PO BOX 1435, SOUTH LANCASTER, MA 01561-1435
PO BOX 1436, SOUTH LANCASTER, MA 01561-1436
PO BOX 1437, SOUTH LANCASTER, MA 01561-1437
PO BOX 1438, SOUTH LANCASTER, MA 01561-1438
PO BOX 1439, SOUTH LANCASTER, MA 01561-1439
PO BOX 1440, SOUTH LANCASTER, MA 01561-1440
PO BOX 1441, SOUTH LANCASTER, MA 01561-1441
PO BOX 1442, SOUTH LANCASTER, MA 01561-1442
PO BOX 1443, SOUTH LANCASTER, MA 01561-1443
PO BOX 1444, SOUTH LANCASTER, MA 01561-1444
PO BOX 1445, SOUTH LANCASTER, MA 01561-1445
PO BOX 1446, SOUTH LANCASTER, MA 01561-1446
PO BOX 1447, SOUTH LANCASTER, MA 01561-1447
PO BOX 1448, SOUTH LANCASTER, MA 01561-1448
PO BOX 1449, SOUTH LANCASTER, MA 01561-1449
PO BOX 1450, SOUTH LANCASTER, MA 01561-1450
PO BOX 1451, SOUTH LANCASTER, MA 01561-1451
PO BOX 1452, SOUTH LANCASTER, MA 01561-1452
PO BOX 1453, SOUTH LANCASTER, MA 01561-1453
PO BOX 1454, SOUTH LANCASTER, MA 01561-1454
PO BOX 1455, SOUTH LANCASTER, MA 01561-1455
PO BOX 1456, SOUTH LANCASTER, MA 01561-1456
PO BOX 1457, SOUTH LANCASTER, MA 01561-1457
PO BOX 1458, SOUTH LANCASTER, MA 01561-1458
PO BOX 1459, SOUTH LANCASTER, MA 01561-1459
PO BOX 1460, SOUTH LANCASTER, MA 01561-1460
PO BOX 1461, SOUTH LANCASTER, MA 01561-1461
PO BOX 1462, SOUTH LANCASTER, MA 01561-1462
PO BOX 1463, SOUTH LANCASTER, MA 01561-1463
PO BOX 1464, SOUTH LANCASTER, MA 01561-1464
PO BOX 1465, SOUTH LANCASTER, MA 01561-1465
PO BOX 1466, SOUTH LANCASTER, MA 01561-1466
PO BOX 1467, SOUTH LANCASTER, MA 01561-1467
PO BOX 1468, SOUTH LANCASTER, MA 01561-1468
PO BOX 1469, SOUTH LANCASTER, MA 01561-1469
PO BOX 1470, SOUTH LANCASTER, MA 01561-1470
PO BOX 1471, SOUTH LANCASTER, MA 01561-1471
PO BOX 1472, SOUTH LANCASTER, MA 01561-1472
PO BOX 1473, SOUTH LANCASTER, MA 01561-1473
PO BOX 1474, SOUTH LANCASTER, MA 01561-1474
PO BOX 1475, SOUTH LANCASTER, MA 01561-1475
PO BOX 1476, SOUTH LANCASTER, MA 01561-1476
PO BOX 1477, SOUTH LANCASTER, MA 01561-1477
PO BOX 1478, SOUTH LANCASTER, MA 01561-1478
PO BOX 1479, SOUTH LANCASTER, MA 01561-1479
PO BOX 1480, SOUTH LANCASTER, MA 01561-1480
PO BOX 1481, SOUTH LANCASTER, MA 01561-1481
PO BOX 1482, SOUTH LANCASTER, MA 01561-1482
PO BOX 1483, SOUTH LANCASTER, MA 01561-1483
PO BOX 1484, SOUTH LANCASTER, MA 01561-1484
PO BOX 1485, SOUTH LANCASTER, MA 01561-1485
PO BOX 1486, SOUTH LANCASTER, MA 01561-1486
PO BOX 1487, SOUTH LANCASTER, MA 01561-1487
PO BOX 1488, SOUTH LANCASTER, MA 01561-1488
PO BOX 1489, SOUTH LANCASTER, MA 01561-1489
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