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 81434, SPRINGFIELD, MA 01138-1434
PO BOX 81435, SPRINGFIELD, MA 01138-1435
PO BOX 81436, SPRINGFIELD, MA 01138-1436
PO BOX 81437, SPRINGFIELD, MA 01138-1437
PO BOX 81438, SPRINGFIELD, MA 01138-1438
PO BOX 81439, SPRINGFIELD, MA 01138-1439
PO BOX 81440, SPRINGFIELD, MA 01138-1440
PO BOX 81441, SPRINGFIELD, MA 01138-1441
PO BOX 81442, SPRINGFIELD, MA 01138-1442
PO BOX 81443, SPRINGFIELD, MA 01138-1443
PO BOX 81444, SPRINGFIELD, MA 01138-1444
PO BOX 81445, SPRINGFIELD, MA 01138-1445
PO BOX 81446, SPRINGFIELD, MA 01138-1446
PO BOX 81447, SPRINGFIELD, MA 01138-1447
PO BOX 81448, SPRINGFIELD, MA 01138-1448
PO BOX 81449, SPRINGFIELD, MA 01138-1449
PO BOX 81450, SPRINGFIELD, MA 01138-1450
PO BOX 81451, SPRINGFIELD, MA 01138-1451
PO BOX 81452, SPRINGFIELD, MA 01138-1452
PO BOX 81453, SPRINGFIELD, MA 01138-1453
PO BOX 81454, SPRINGFIELD, MA 01138-1454
PO BOX 81455, SPRINGFIELD, MA 01138-1455
PO BOX 81456, SPRINGFIELD, MA 01138-1456
PO BOX 81457, SPRINGFIELD, MA 01138-1457
PO BOX 81458, SPRINGFIELD, MA 01138-1458
PO BOX 81459, SPRINGFIELD, MA 01138-1459
PO BOX 81460, SPRINGFIELD, MA 01138-1460
PO BOX 81461, SPRINGFIELD, MA 01138-1461
PO BOX 81462, SPRINGFIELD, MA 01138-1462
PO BOX 81463, SPRINGFIELD, MA 01138-1463
PO BOX 81464, SPRINGFIELD, MA 01138-1464
PO BOX 81465, SPRINGFIELD, MA 01138-1465
PO BOX 81466, SPRINGFIELD, MA 01138-1466
PO BOX 81467, SPRINGFIELD, MA 01138-1467
PO BOX 81468, SPRINGFIELD, MA 01138-1468
PO BOX 81469, SPRINGFIELD, MA 01138-1469
PO BOX 81470, SPRINGFIELD, MA 01138-1470
PO BOX 81471, SPRINGFIELD, MA 01138-1471
PO BOX 81472, SPRINGFIELD, MA 01138-1472
PO BOX 81473, SPRINGFIELD, MA 01138-1473
PO BOX 81474, SPRINGFIELD, MA 01138-1474
PO BOX 81475, SPRINGFIELD, MA 01138-1475
PO BOX 81476, SPRINGFIELD, MA 01138-1476
PO BOX 81477, SPRINGFIELD, MA 01138-1477
PO BOX 81478, SPRINGFIELD, MA 01138-1478
PO BOX 81479, SPRINGFIELD, MA 01138-1479
PO BOX 81480, SPRINGFIELD, MA 01138-1480
PO BOX 81481, SPRINGFIELD, MA 01138-1481
PO BOX 81482, SPRINGFIELD, MA 01138-1482
PO BOX 81483, SPRINGFIELD, MA 01138-1483
PO BOX 81484, SPRINGFIELD, MA 01138-1484
PO BOX 81485, SPRINGFIELD, MA 01138-1485
PO BOX 81486, SPRINGFIELD, MA 01138-1486
PO BOX 81487, SPRINGFIELD, MA 01138-1487
PO BOX 81488, SPRINGFIELD, MA 01138-1488
PO BOX 81489, SPRINGFIELD, MA 01138-1489
PO BOX 81490, SPRINGFIELD, MA 01138-1490
PO BOX 81491, SPRINGFIELD, MA 01138-1491
PO BOX 81492, SPRINGFIELD, MA 01138-1492
PO BOX 81493, SPRINGFIELD, MA 01138-1493
PO BOX 81494, SPRINGFIELD, MA 01138-1494
PO BOX 81495, SPRINGFIELD, MA 01138-1495
PO BOX 81496, SPRINGFIELD, MA 01138-1496
PO BOX 81497, SPRINGFIELD, MA 01138-1497
PO BOX 81498, SPRINGFIELD, MA 01138-1498
PO BOX 81499, SPRINGFIELD, MA 01138-1499
PO BOX 81500, SPRINGFIELD, MA 01138-1500
PO BOX 81501, SPRINGFIELD, MA 01138-1501
PO BOX 81502, SPRINGFIELD, MA 01138-1502
PO BOX 81503, SPRINGFIELD, MA 01138-1503
PO BOX 81504, SPRINGFIELD, MA 01138-1504
PO BOX 81505, SPRINGFIELD, MA 01138-1505
PO BOX 81506, SPRINGFIELD, MA 01138-1506
PO BOX 81507, SPRINGFIELD, MA 01138-1507
PO BOX 81508, SPRINGFIELD, MA 01138-1508
PO BOX 81509, SPRINGFIELD, MA 01138-1509
PO BOX 81510, SPRINGFIELD, MA 01138-1510
PO BOX 81511, SPRINGFIELD, MA 01138-1511
PO BOX 81512, SPRINGFIELD, MA 01138-1512
PO BOX 81513, SPRINGFIELD, MA 01138-1513
PO BOX 81514, SPRINGFIELD, MA 01138-1514
PO BOX 81515, SPRINGFIELD, MA 01138-1515
PO BOX 81516, SPRINGFIELD, MA 01138-1516
PO BOX 81517, SPRINGFIELD, MA 01138-1517
PO BOX 81518, SPRINGFIELD, MA 01138-1518
PO BOX 81519, SPRINGFIELD, MA 01138-1519
PO BOX 81520, SPRINGFIELD, MA 01138-1520
PO BOX 81521, SPRINGFIELD, MA 01138-1521
PO BOX 81522, SPRINGFIELD, MA 01138-1522
PO BOX 81523, SPRINGFIELD, MA 01138-1523
PO BOX 81524, SPRINGFIELD, MA 01138-1524
PO BOX 81525, SPRINGFIELD, MA 01138-1525
PO BOX 81526, SPRINGFIELD, MA 01138-1526
PO BOX 81527, SPRINGFIELD, MA 01138-1527
PO BOX 81528, SPRINGFIELD, MA 01138-1528
PO BOX 81529, SPRINGFIELD, MA 01138-1529
PO BOX 81530, SPRINGFIELD, MA 01138-1530
PO BOX 81531, SPRINGFIELD, MA 01138-1531
PO BOX 81532, SPRINGFIELD, MA 01138-1532
PO BOX 81533, SPRINGFIELD, MA 01138-1533
PO BOX 81534, SPRINGFIELD, MA 01138-1534
PO BOX 81535, SPRINGFIELD, MA 01138-1535
PO BOX 81536, SPRINGFIELD, MA 01138-1536
PO BOX 81537, SPRINGFIELD, MA 01138-1537
PO BOX 81538, SPRINGFIELD, MA 01138-1538
PO BOX 81539, SPRINGFIELD, MA 01138-1539
PO BOX 81540, SPRINGFIELD, MA 01138-1540
PO BOX 81541, SPRINGFIELD, MA 01138-1541
PO BOX 81542, SPRINGFIELD, MA 01138-1542
PO BOX 81543, SPRINGFIELD, MA 01138-1543
PO BOX 81544, SPRINGFIELD, MA 01138-1544
PO BOX 81545, SPRINGFIELD, MA 01138-1545
PO BOX 81546, SPRINGFIELD, MA 01138-1546
PO BOX 81547, SPRINGFIELD, MA 01138-1547
PO BOX 81548, SPRINGFIELD, MA 01138-1548
PO BOX 81549, SPRINGFIELD, MA 01138-1549
PO BOX 81550, SPRINGFIELD, MA 01138-1550
PO BOX 81551, SPRINGFIELD, MA 01138-1551
PO BOX 81552, SPRINGFIELD, MA 01138-1552
PO BOX 81553, SPRINGFIELD, MA 01138-1553
PO BOX 81554, SPRINGFIELD, MA 01138-1554
PO BOX 81555, SPRINGFIELD, MA 01138-1555
PO BOX 81556, SPRINGFIELD, MA 01138-1556
PO BOX 81557, SPRINGFIELD, MA 01138-1557
PO BOX 81558, SPRINGFIELD, MA 01138-1558
PO BOX 81559, SPRINGFIELD, MA 01138-1559
PO BOX 81560, SPRINGFIELD, MA 01138-1560
PO BOX 81561, SPRINGFIELD, MA 01138-1561
PO BOX 81562, SPRINGFIELD, MA 01138-1562
PO BOX 81563, SPRINGFIELD, MA 01138-1563
PO BOX 81564, SPRINGFIELD, MA 01138-1564
PO BOX 81565, SPRINGFIELD, MA 01138-1565
PO BOX 81566, SPRINGFIELD, MA 01138-1566
PO BOX 81567, SPRINGFIELD, MA 01138-1567
PO BOX 81568, SPRINGFIELD, MA 01138-1568
PO BOX 81569, SPRINGFIELD, MA 01138-1569
PO BOX 81570, SPRINGFIELD, MA 01138-1570
PO BOX 81571, SPRINGFIELD, MA 01138-1571
PO BOX 81572, SPRINGFIELD, MA 01138-1572
PO BOX 81573, SPRINGFIELD, MA 01138-1573
PO BOX 81574, SPRINGFIELD, MA 01138-1574
PO BOX 81575, SPRINGFIELD, MA 01138-1575
PO BOX 81576, SPRINGFIELD, MA 01138-1576
PO BOX 81577, SPRINGFIELD, MA 01138-1577
PO BOX 81578, SPRINGFIELD, MA 01138-1578
PO BOX 81579, SPRINGFIELD, MA 01138-1579
PO BOX 81580, SPRINGFIELD, MA 01138-1580
PO BOX 81581, SPRINGFIELD, MA 01138-1581
PO BOX 81582, SPRINGFIELD, MA 01138-1582
PO BOX 81583, SPRINGFIELD, MA 01138-1583
PO BOX 81584, SPRINGFIELD, MA 01138-1584
PO BOX 81585, SPRINGFIELD, MA 01138-1585
PO BOX 81586, SPRINGFIELD, MA 01138-1586
PO BOX 81587, SPRINGFIELD, MA 01138-1587
PO BOX 81588, SPRINGFIELD, MA 01138-1588
PO BOX 81589, SPRINGFIELD, MA 01138-1589
PO BOX 81590, SPRINGFIELD, MA 01138-1590
PO BOX 81591, SPRINGFIELD, MA 01138-1591
PO BOX 81592, SPRINGFIELD, MA 01138-1592
PO BOX 81593, SPRINGFIELD, MA 01138-1593
PO BOX 81594, SPRINGFIELD, MA 01138-1594
PO BOX 81595, SPRINGFIELD, MA 01138-1595
PO BOX 81596, SPRINGFIELD, MA 01138-1596
PO BOX 81597, SPRINGFIELD, MA 01138-1597
PO BOX 81598, SPRINGFIELD, MA 01138-1598
PO BOX 81599, SPRINGFIELD, MA 01138-1599
PO BOX 81600, SPRINGFIELD, MA 01138-1600
PO BOX 81601, SPRINGFIELD, MA 01138-1601
PO BOX 81602, SPRINGFIELD, MA 01138-1602
PO BOX 81603, SPRINGFIELD, MA 01138-1603
PO BOX 81604, SPRINGFIELD, MA 01138-1604
PO BOX 81605, SPRINGFIELD, MA 01138-1605
PO BOX 81606, SPRINGFIELD, MA 01138-1606
PO BOX 81607, SPRINGFIELD, MA 01138-1607
PO BOX 81608, SPRINGFIELD, MA 01138-1608
PO BOX 81609, SPRINGFIELD, MA 01138-1609
PO BOX 81610, SPRINGFIELD, MA 01138-1610
PO BOX 81611, SPRINGFIELD, MA 01138-1611
PO BOX 81612, SPRINGFIELD, MA 01138-1612
PO BOX 81613, SPRINGFIELD, MA 01138-1613
PO BOX 81614, SPRINGFIELD, MA 01138-1614
PO BOX 81615, SPRINGFIELD, MA 01138-1615
PO BOX 81616, SPRINGFIELD, MA 01138-1616
PO BOX 81617, SPRINGFIELD, MA 01138-1617
PO BOX 81618, SPRINGFIELD, MA 01138-1618
PO BOX 81619, SPRINGFIELD, MA 01138-1619
PO BOX 81620, SPRINGFIELD, MA 01138-1620
PO BOX 81621, SPRINGFIELD, MA 01138-1621
PO BOX 81622, SPRINGFIELD, MA 01138-1622
PO BOX 81623, SPRINGFIELD, MA 01138-1623
PO BOX 81624, SPRINGFIELD, MA 01138-1624
PO BOX 81625, SPRINGFIELD, MA 01138-1625
PO BOX 81626, SPRINGFIELD, MA 01138-1626
PO BOX 81627, SPRINGFIELD, MA 01138-1627
PO BOX 81628, SPRINGFIELD, MA 01138-1628
PO BOX 81629, SPRINGFIELD, MA 01138-1629
PO BOX 81630, SPRINGFIELD, MA 01138-1630
PO BOX 81631, SPRINGFIELD, MA 01138-1631
PO BOX 81632, SPRINGFIELD, MA 01138-1632
PO BOX 81633, SPRINGFIELD, MA 01138-1633
PO BOX 81634, SPRINGFIELD, MA 01138-1634
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