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 1441, IDAHO FALLS, ID 83403-1441
PO BOX 1442, IDAHO FALLS, ID 83403-1442
PO BOX 1443, IDAHO FALLS, ID 83403-1443
PO BOX 1444, IDAHO FALLS, ID 83403-1444
PO BOX 1445, IDAHO FALLS, ID 83403-1445
PO BOX 1446, IDAHO FALLS, ID 83403-1446
PO BOX 1447, IDAHO FALLS, ID 83403-1447
PO BOX 1448, IDAHO FALLS, ID 83403-1448
PO BOX 1449, IDAHO FALLS, ID 83403-1449
PO BOX 1450, IDAHO FALLS, ID 83403-1450
PO BOX 1451, IDAHO FALLS, ID 83403-1451
PO BOX 1452, IDAHO FALLS, ID 83403-1452
PO BOX 1453, IDAHO FALLS, ID 83403-1453
PO BOX 1454, IDAHO FALLS, ID 83403-1454
PO BOX 1455, IDAHO FALLS, ID 83403-1455
PO BOX 1456, IDAHO FALLS, ID 83403-1456
PO BOX 1457, IDAHO FALLS, ID 83403-1457
PO BOX 1458, IDAHO FALLS, ID 83403-1458
PO BOX 1459, IDAHO FALLS, ID 83403-1459
PO BOX 1460, IDAHO FALLS, ID 83403-1460
PO BOX 1461, IDAHO FALLS, ID 83403-1461
PO BOX 1462, IDAHO FALLS, ID 83403-1462
PO BOX 1463, IDAHO FALLS, ID 83403-1463
PO BOX 1464, IDAHO FALLS, ID 83403-1464
PO BOX 1465, IDAHO FALLS, ID 83403-1465
PO BOX 1466, IDAHO FALLS, ID 83403-1466
PO BOX 1467, IDAHO FALLS, ID 83403-1467
PO BOX 1468, IDAHO FALLS, ID 83403-1468
PO BOX 1469, IDAHO FALLS, ID 83403-1469
PO BOX 1470, IDAHO FALLS, ID 83403-1470
PO BOX 1471, IDAHO FALLS, ID 83403-1471
PO BOX 1472, IDAHO FALLS, ID 83403-1472
PO BOX 1473, IDAHO FALLS, ID 83403-1473
PO BOX 1474, IDAHO FALLS, ID 83403-1474
PO BOX 1475, IDAHO FALLS, ID 83403-1475
PO BOX 1476, IDAHO FALLS, ID 83403-1476
PO BOX 1477, IDAHO FALLS, ID 83403-1477
PO BOX 1478, IDAHO FALLS, ID 83403-1478
PO BOX 1479, IDAHO FALLS, ID 83403-1479
PO BOX 1480, IDAHO FALLS, ID 83403-1480
PO BOX 1481, IDAHO FALLS, ID 83403-1481
PO BOX 1482, IDAHO FALLS, ID 83403-1482
PO BOX 1483, IDAHO FALLS, ID 83403-1483
PO BOX 1484, IDAHO FALLS, ID 83403-1484
PO BOX 1485, IDAHO FALLS, ID 83403-1485
PO BOX 1486, IDAHO FALLS, ID 83403-1486
PO BOX 1487, IDAHO FALLS, ID 83403-1487
PO BOX 1488, IDAHO FALLS, ID 83403-1488
PO BOX 1489, IDAHO FALLS, ID 83403-1489
PO BOX 1490, IDAHO FALLS, ID 83403-1490
PO BOX 1491, IDAHO FALLS, ID 83403-1491
PO BOX 1492, IDAHO FALLS, ID 83403-1492
PO BOX 1493, IDAHO FALLS, ID 83403-1493
PO BOX 1494, IDAHO FALLS, ID 83403-1494
PO BOX 1495, IDAHO FALLS, ID 83403-1495
PO BOX 1496, IDAHO FALLS, ID 83403-1496
PO BOX 1497, IDAHO FALLS, ID 83403-1497
PO BOX 1498, IDAHO FALLS, ID 83403-1498
PO BOX 1499, IDAHO FALLS, ID 83403-1499
PO BOX 1500, IDAHO FALLS, ID 83403-1500
PO BOX 1501, IDAHO FALLS, ID 83403-1501
PO BOX 1502, IDAHO FALLS, ID 83403-1502
PO BOX 1503, IDAHO FALLS, ID 83403-1503
PO BOX 1504, IDAHO FALLS, ID 83403-1504
PO BOX 1505, IDAHO FALLS, ID 83403-1505
PO BOX 1506, IDAHO FALLS, ID 83403-1506
PO BOX 1507, IDAHO FALLS, ID 83403-1507
PO BOX 1508, IDAHO FALLS, ID 83403-1508
PO BOX 1509, IDAHO FALLS, ID 83403-1509
PO BOX 1510, IDAHO FALLS, ID 83403-1510
PO BOX 1511, IDAHO FALLS, ID 83403-1511
PO BOX 1512, IDAHO FALLS, ID 83403-1512
PO BOX 1513, IDAHO FALLS, ID 83403-1513
PO BOX 1514, IDAHO FALLS, ID 83403-1514
PO BOX 1515, IDAHO FALLS, ID 83403-1515
PO BOX 1516, IDAHO FALLS, ID 83403-1516
PO BOX 1517, IDAHO FALLS, ID 83403-1517
PO BOX 1518, IDAHO FALLS, ID 83403-1518
PO BOX 1519, IDAHO FALLS, ID 83403-1519
PO BOX 1520, IDAHO FALLS, ID 83403-1520
PO BOX 1521, IDAHO FALLS, ID 83403-1521
PO BOX 1522, IDAHO FALLS, ID 83403-1522
PO BOX 1523, IDAHO FALLS, ID 83403-1523
PO BOX 1524, IDAHO FALLS, ID 83403-1524
PO BOX 1525, IDAHO FALLS, ID 83403-1525
PO BOX 1526, IDAHO FALLS, ID 83403-1526
PO BOX 1527, IDAHO FALLS, ID 83403-1527
PO BOX 1528, IDAHO FALLS, ID 83403-1528
PO BOX 1529, IDAHO FALLS, ID 83403-1529
PO BOX 1530, IDAHO FALLS, ID 83403-1530
PO BOX 1531, IDAHO FALLS, ID 83403-1531
PO BOX 1532, IDAHO FALLS, ID 83403-1532
PO BOX 1533, IDAHO FALLS, ID 83403-1533
PO BOX 1534, IDAHO FALLS, ID 83403-1534
PO BOX 1535, IDAHO FALLS, ID 83403-1535
PO BOX 1536, IDAHO FALLS, ID 83403-1536
PO BOX 1537, IDAHO FALLS, ID 83403-1537
PO BOX 1538, IDAHO FALLS, ID 83403-1538
PO BOX 1539, IDAHO FALLS, ID 83403-1539
PO BOX 1540, IDAHO FALLS, ID 83403-1540
PO BOX 1541, IDAHO FALLS, ID 83403-1541
PO BOX 1542, IDAHO FALLS, ID 83403-1542
PO BOX 1543, IDAHO FALLS, ID 83403-1543
PO BOX 1544, IDAHO FALLS, ID 83403-1544
PO BOX 1545, IDAHO FALLS, ID 83403-1545
PO BOX 1546, IDAHO FALLS, ID 83403-1546
PO BOX 1547, IDAHO FALLS, ID 83403-1547
PO BOX 1548, IDAHO FALLS, ID 83403-1548
PO BOX 1549, IDAHO FALLS, ID 83403-1549
PO BOX 1550, IDAHO FALLS, ID 83403-1550
PO BOX 1551, IDAHO FALLS, ID 83403-1551
PO BOX 1552, IDAHO FALLS, ID 83403-1552
PO BOX 1553, IDAHO FALLS, ID 83403-1553
PO BOX 1554, IDAHO FALLS, ID 83403-1554
PO BOX 1555, IDAHO FALLS, ID 83403-1555
PO BOX 1556, IDAHO FALLS, ID 83403-1556
PO BOX 1557, IDAHO FALLS, ID 83403-1557
PO BOX 1558, IDAHO FALLS, ID 83403-1558
PO BOX 1559, IDAHO FALLS, ID 83403-1559
PO BOX 1560, IDAHO FALLS, ID 83403-1560
PO BOX 1561, IDAHO FALLS, ID 83403-1561
PO BOX 1562, IDAHO FALLS, ID 83403-1562
PO BOX 1563, IDAHO FALLS, ID 83403-1563
PO BOX 1564, IDAHO FALLS, ID 83403-1564
PO BOX 1565, IDAHO FALLS, ID 83403-1565
PO BOX 1566, IDAHO FALLS, ID 83403-1566
PO BOX 1567, IDAHO FALLS, ID 83403-1567
PO BOX 1568, IDAHO FALLS, ID 83403-1568
PO BOX 1569, IDAHO FALLS, ID 83403-1569
PO BOX 1570, IDAHO FALLS, ID 83403-1570
PO BOX 1571, IDAHO FALLS, ID 83403-1571
PO BOX 1572, IDAHO FALLS, ID 83403-1572
PO BOX 1573, IDAHO FALLS, ID 83403-1573
PO BOX 1574, IDAHO FALLS, ID 83403-1574
PO BOX 1575, IDAHO FALLS, ID 83403-1575
PO BOX 1576, IDAHO FALLS, ID 83403-1576
PO BOX 1577, IDAHO FALLS, ID 83403-1577
PO BOX 1578, IDAHO FALLS, ID 83403-1578
PO BOX 1579, IDAHO FALLS, ID 83403-1579
PO BOX 1580, IDAHO FALLS, ID 83403-1580
PO BOX 1581, IDAHO FALLS, ID 83403-1581
PO BOX 1582, IDAHO FALLS, ID 83403-1582
PO BOX 1583, IDAHO FALLS, ID 83403-1583
PO BOX 1584, IDAHO FALLS, ID 83403-1584
PO BOX 1585, IDAHO FALLS, ID 83403-1585
PO BOX 1586, IDAHO FALLS, ID 83403-1586
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