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 1501, SIOUX FALLS, SD 57101-1501
PO BOX 1502, SIOUX FALLS, SD 57101-1502
PO BOX 1503, SIOUX FALLS, SD 57101-1503
PO BOX 1504, SIOUX FALLS, SD 57101-1504
PO BOX 1505, SIOUX FALLS, SD 57101-1505
PO BOX 1506, SIOUX FALLS, SD 57101-1506
PO BOX 1507, SIOUX FALLS, SD 57101-1507
PO BOX 1508, SIOUX FALLS, SD 57101-1508
PO BOX 1509, SIOUX FALLS, SD 57101-1509
PO BOX 1510, SIOUX FALLS, SD 57101-1510
PO BOX 1511, SIOUX FALLS, SD 57101-1511
PO BOX 1512, SIOUX FALLS, SD 57101-1512
PO BOX 1513, SIOUX FALLS, SD 57101-1513
PO BOX 1514, SIOUX FALLS, SD 57101-1514
PO BOX 1515, SIOUX FALLS, SD 57101-1515
PO BOX 1516, SIOUX FALLS, SD 57101-1516
PO BOX 1517, SIOUX FALLS, SD 57101-1517
PO BOX 1518, SIOUX FALLS, SD 57101-1518
PO BOX 1519, SIOUX FALLS, SD 57101-1519
PO BOX 1520, SIOUX FALLS, SD 57101-1520
PO BOX 1521, SIOUX FALLS, SD 57101-1521
PO BOX 1522, SIOUX FALLS, SD 57101-1522
PO BOX 1523, SIOUX FALLS, SD 57101-1523
PO BOX 1524, SIOUX FALLS, SD 57101-1524
PO BOX 1525, SIOUX FALLS, SD 57101-1525
PO BOX 1526, SIOUX FALLS, SD 57101-1526
PO BOX 1527, SIOUX FALLS, SD 57101-1527
PO BOX 1528, SIOUX FALLS, SD 57101-1528
PO BOX 1529, SIOUX FALLS, SD 57101-1529
PO BOX 1530, SIOUX FALLS, SD 57101-1530
PO BOX 1531, SIOUX FALLS, SD 57101-1531
PO BOX 1532, SIOUX FALLS, SD 57101-1532
PO BOX 1533, SIOUX FALLS, SD 57101-1533
PO BOX 1534, SIOUX FALLS, SD 57101-1534
PO BOX 1535, SIOUX FALLS, SD 57101-1535
PO BOX 1536, SIOUX FALLS, SD 57101-1536
PO BOX 1537, SIOUX FALLS, SD 57101-1537
PO BOX 1538, SIOUX FALLS, SD 57101-1538
PO BOX 1539, SIOUX FALLS, SD 57101-1539
PO BOX 1540, SIOUX FALLS, SD 57101-1540
PO BOX 1541, SIOUX FALLS, SD 57101-1541
PO BOX 1542, SIOUX FALLS, SD 57101-1542
PO BOX 1543, SIOUX FALLS, SD 57101-1543
PO BOX 1544, SIOUX FALLS, SD 57101-1544
PO BOX 1545, SIOUX FALLS, SD 57101-1545
PO BOX 1546, SIOUX FALLS, SD 57101-1546
PO BOX 1547, SIOUX FALLS, SD 57101-1547
PO BOX 1548, SIOUX FALLS, SD 57101-1548
PO BOX 1549, SIOUX FALLS, SD 57101-1549
PO BOX 1550, SIOUX FALLS, SD 57101-1550
PO BOX 1551, SIOUX FALLS, SD 57101-1551
PO BOX 1552, SIOUX FALLS, SD 57101-1552
PO BOX 1553, SIOUX FALLS, SD 57101-1553
PO BOX 1554, SIOUX FALLS, SD 57101-1554
PO BOX 1555, SIOUX FALLS, SD 57101-1555
PO BOX 1556, SIOUX FALLS, SD 57101-1556
PO BOX 1557, SIOUX FALLS, SD 57101-1557
PO BOX 1558, SIOUX FALLS, SD 57101-1558
PO BOX 1559, SIOUX FALLS, SD 57101-1559
PO BOX 1560, SIOUX FALLS, SD 57101-1560
PO BOX 1561, SIOUX FALLS, SD 57101-1561
PO BOX 1562, SIOUX FALLS, SD 57101-1562
PO BOX 1563, SIOUX FALLS, SD 57101-1563
PO BOX 1564, SIOUX FALLS, SD 57101-1564
PO BOX 1565, SIOUX FALLS, SD 57101-1565
PO BOX 1566, SIOUX FALLS, SD 57101-1566
PO BOX 1567, SIOUX FALLS, SD 57101-1567
PO BOX 1568, SIOUX FALLS, SD 57101-1568
PO BOX 1569, SIOUX FALLS, SD 57101-1569
PO BOX 1570, SIOUX FALLS, SD 57101-1570
PO BOX 1571, SIOUX FALLS, SD 57101-1571
PO BOX 1572, SIOUX FALLS, SD 57101-1572
PO BOX 1573, SIOUX FALLS, SD 57101-1573
PO BOX 1574, SIOUX FALLS, SD 57101-1574
PO BOX 1575, SIOUX FALLS, SD 57101-1575
PO BOX 1576, SIOUX FALLS, SD 57101-1576
PO BOX 1577, SIOUX FALLS, SD 57101-1577
PO BOX 1578, SIOUX FALLS, SD 57101-1578
PO BOX 1579, SIOUX FALLS, SD 57101-1579
PO BOX 1580, SIOUX FALLS, SD 57101-1580
PO BOX 1581, SIOUX FALLS, SD 57101-1581
PO BOX 1582, SIOUX FALLS, SD 57101-1582
PO BOX 1583, SIOUX FALLS, SD 57101-1583
PO BOX 1584, SIOUX FALLS, SD 57101-1584
PO BOX 1585, SIOUX FALLS, SD 57101-1585
PO BOX 1586, SIOUX FALLS, SD 57101-1586
PO BOX 1587, SIOUX FALLS, SD 57101-1587
PO BOX 1588, SIOUX FALLS, SD 57101-1588
PO BOX 1589, SIOUX FALLS, SD 57101-1589
PO BOX 1590, SIOUX FALLS, SD 57101-1590
PO BOX 1591, SIOUX FALLS, SD 57101-1591
PO BOX 1592, SIOUX FALLS, SD 57101-1592
PO BOX 1593, SIOUX FALLS, SD 57101-1593
PO BOX 1594, SIOUX FALLS, SD 57101-1594
PO BOX 1595, SIOUX FALLS, SD 57101-1595
PO BOX 1596, SIOUX FALLS, SD 57101-1596
PO BOX 1597, SIOUX FALLS, SD 57101-1597
PO BOX 1598, SIOUX FALLS, SD 57101-1598
PO BOX 1599, SIOUX FALLS, SD 57101-1599
PO BOX 1600, SIOUX FALLS, SD 57101-1600
PO BOX 1601, SIOUX FALLS, SD 57101-1601
PO BOX 1602, SIOUX FALLS, SD 57101-1602
PO BOX 1603, SIOUX FALLS, SD 57101-1603
PO BOX 1604, SIOUX FALLS, SD 57101-1604
PO BOX 1605, SIOUX FALLS, SD 57101-1605
PO BOX 1606, SIOUX FALLS, SD 57101-1606
PO BOX 1607, SIOUX FALLS, SD 57101-1607
PO BOX 1608, SIOUX FALLS, SD 57101-1608
PO BOX 1609, SIOUX FALLS, SD 57101-1609
PO BOX 1610, SIOUX FALLS, SD 57101-1610
PO BOX 1611, SIOUX FALLS, SD 57101-1611
PO BOX 1612, SIOUX FALLS, SD 57101-1612
PO BOX 1613, SIOUX FALLS, SD 57101-1613
PO BOX 1614, SIOUX FALLS, SD 57101-1614
PO BOX 1615, SIOUX FALLS, SD 57101-1615
PO BOX 1616, SIOUX FALLS, SD 57101-1616
PO BOX 1617, SIOUX FALLS, SD 57101-1617
PO BOX 1618, SIOUX FALLS, SD 57101-1618
PO BOX 1619, SIOUX FALLS, SD 57101-1619
PO BOX 1620, SIOUX FALLS, SD 57101-1620
PO BOX 1621, SIOUX FALLS, SD 57101-1621
PO BOX 1622, SIOUX FALLS, SD 57101-1622
PO BOX 1623, SIOUX FALLS, SD 57101-1623
PO BOX 1624, SIOUX FALLS, SD 57101-1624
PO BOX 1625, SIOUX FALLS, SD 57101-1625
PO BOX 1626, SIOUX FALLS, SD 57101-1626
PO BOX 1627, SIOUX FALLS, SD 57101-1627
PO BOX 1628, SIOUX FALLS, SD 57101-1628
PO BOX 1629, SIOUX FALLS, SD 57101-1629
PO BOX 1630, SIOUX FALLS, SD 57101-1630
PO BOX 1631, SIOUX FALLS, SD 57101-1631
PO BOX 1632, SIOUX FALLS, SD 57101-1632
PO BOX 1633, SIOUX FALLS, SD 57101-1633
PO BOX 1634, SIOUX FALLS, SD 57101-1634
PO BOX 1635, SIOUX FALLS, SD 57101-1635
PO BOX 1636, SIOUX FALLS, SD 57101-1636
PO BOX 1637, SIOUX FALLS, SD 57101-1637
PO BOX 1638, SIOUX FALLS, SD 57101-1638
PO BOX 1639, SIOUX FALLS, SD 57101-1639
PO BOX 1640, SIOUX FALLS, SD 57101-1640
PO BOX 1641, SIOUX FALLS, SD 57101-1641
PO BOX 1642, SIOUX FALLS, SD 57101-1642
PO BOX 1643, SIOUX FALLS, SD 57101-1643
PO BOX 1644, SIOUX FALLS, SD 57101-1644
PO BOX 1645, SIOUX FALLS, SD 57101-1645
PO BOX 1646, SIOUX FALLS, SD 57101-1646
PO BOX 1647, SIOUX FALLS, SD 57101-1647
PO BOX 1648, SIOUX FALLS, SD 57101-1648
PO BOX 1649, SIOUX FALLS, SD 57101-1649
PO BOX 1650, SIOUX FALLS, SD 57101-1650
PO BOX 1651, SIOUX FALLS, SD 57101-1651
PO BOX 1652, SIOUX FALLS, SD 57101-1652
PO BOX 1653, SIOUX FALLS, SD 57101-1653
PO BOX 1654, SIOUX FALLS, SD 57101-1654
PO BOX 1655, SIOUX FALLS, SD 57101-1655
PO BOX 1656, SIOUX FALLS, SD 57101-1656
PO BOX 1657, SIOUX FALLS, SD 57101-1657
PO BOX 1658, SIOUX FALLS, SD 57101-1658
PO BOX 1659, SIOUX FALLS, SD 57101-1659
PO BOX 1660, SIOUX FALLS, SD 57101-1660
PO BOX 1661, SIOUX FALLS, SD 57101-1661
PO BOX 1662, SIOUX FALLS, SD 57101-1662
PO BOX 1663, SIOUX FALLS, SD 57101-1663
PO BOX 1664, SIOUX FALLS, SD 57101-1664
PO BOX 1665, SIOUX FALLS, SD 57101-1665
PO BOX 1666, SIOUX FALLS, SD 57101-1666
PO BOX 1667, SIOUX FALLS, SD 57101-1667
PO BOX 1668, SIOUX FALLS, SD 57101-1668
PO BOX 1669, SIOUX FALLS, SD 57101-1669
PO BOX 1670, SIOUX FALLS, SD 57101-1670
PO BOX 1671, SIOUX FALLS, SD 57101-1671
PO BOX 1672, SIOUX FALLS, SD 57101-1672
PO BOX 1673, SIOUX FALLS, SD 57101-1673
PO BOX 1674, SIOUX FALLS, SD 57101-1674
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