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 1521, BURLINGTON, NC 27216-1521
PO BOX 1522, BURLINGTON, NC 27216-1522
PO BOX 1523, BURLINGTON, NC 27216-1523
PO BOX 1524, BURLINGTON, NC 27216-1524
PO BOX 1525, BURLINGTON, NC 27216-1525
PO BOX 1526, BURLINGTON, NC 27216-1526
PO BOX 1527, BURLINGTON, NC 27216-1527
PO BOX 1528, BURLINGTON, NC 27216-1528
PO BOX 1529, BURLINGTON, NC 27216-1529
PO BOX 1530, BURLINGTON, NC 27216-1530
PO BOX 1531, BURLINGTON, NC 27216-1531
PO BOX 1532, BURLINGTON, NC 27216-1532
PO BOX 1533, BURLINGTON, NC 27216-1533
PO BOX 1534, BURLINGTON, NC 27216-1534
PO BOX 1535, BURLINGTON, NC 27216-1535
PO BOX 1536, BURLINGTON, NC 27216-1536
PO BOX 1537, BURLINGTON, NC 27216-1537
PO BOX 1538, BURLINGTON, NC 27216-1538
PO BOX 1539, BURLINGTON, NC 27216-1539
PO BOX 1540, BURLINGTON, NC 27216-1540
PO BOX 1541, BURLINGTON, NC 27216-1541
PO BOX 1542, BURLINGTON, NC 27216-1542
PO BOX 1543, BURLINGTON, NC 27216-1543
PO BOX 1544, BURLINGTON, NC 27216-1544
PO BOX 1545, BURLINGTON, NC 27216-1545
PO BOX 1546, BURLINGTON, NC 27216-1546
PO BOX 1547, BURLINGTON, NC 27216-1547
PO BOX 1548, BURLINGTON, NC 27216-1548
PO BOX 1549, BURLINGTON, NC 27216-1549
PO BOX 1550, BURLINGTON, NC 27216-1550
PO BOX 1551, BURLINGTON, NC 27216-1551
PO BOX 1552, BURLINGTON, NC 27216-1552
PO BOX 1553, BURLINGTON, NC 27216-1553
PO BOX 1554, BURLINGTON, NC 27216-1554
PO BOX 1555, BURLINGTON, NC 27216-1555
PO BOX 1556, BURLINGTON, NC 27216-1556
PO BOX 1557, BURLINGTON, NC 27216-1557
PO BOX 1558, BURLINGTON, NC 27216-1558
PO BOX 1559, BURLINGTON, NC 27216-1559
PO BOX 1560, BURLINGTON, NC 27216-1560
PO BOX 1561, BURLINGTON, NC 27216-1561
PO BOX 1562, BURLINGTON, NC 27216-1562
PO BOX 1563, BURLINGTON, NC 27216-1563
PO BOX 1564, BURLINGTON, NC 27216-1564
PO BOX 1565, BURLINGTON, NC 27216-1565
PO BOX 1566, BURLINGTON, NC 27216-1566
PO BOX 1567, BURLINGTON, NC 27216-1567
PO BOX 1568, BURLINGTON, NC 27216-1568
PO BOX 1569, BURLINGTON, NC 27216-1569
PO BOX 1570, BURLINGTON, NC 27216-1570
PO BOX 1571, BURLINGTON, NC 27216-1571
PO BOX 1572, BURLINGTON, NC 27216-1572
PO BOX 1573, BURLINGTON, NC 27216-1573
PO BOX 1574, BURLINGTON, NC 27216-1574
PO BOX 1575, BURLINGTON, NC 27216-1575
PO BOX 1576, BURLINGTON, NC 27216-1576
PO BOX 1577, BURLINGTON, NC 27216-1577
PO BOX 1578, BURLINGTON, NC 27216-1578
PO BOX 1579, BURLINGTON, NC 27216-1579
PO BOX 1580, BURLINGTON, NC 27216-1580
PO BOX 1581, BURLINGTON, NC 27216-1581
PO BOX 1582, BURLINGTON, NC 27216-1582
PO BOX 1583, BURLINGTON, NC 27216-1583
PO BOX 1584, BURLINGTON, NC 27216-1584
PO BOX 1585, BURLINGTON, NC 27216-1585
PO BOX 1586, BURLINGTON, NC 27216-1586
PO BOX 1587, BURLINGTON, NC 27216-1587
PO BOX 1588, BURLINGTON, NC 27216-1588
PO BOX 1589, BURLINGTON, NC 27216-1589
PO BOX 1590, BURLINGTON, NC 27216-1590
PO BOX 1591, BURLINGTON, NC 27216-1591
PO BOX 1592, BURLINGTON, NC 27216-1592
PO BOX 1593, BURLINGTON, NC 27216-1593
PO BOX 1594, BURLINGTON, NC 27216-1594
PO BOX 1595, BURLINGTON, NC 27216-1595
PO BOX 1596, BURLINGTON, NC 27216-1596
PO BOX 1597, BURLINGTON, NC 27216-1597
PO BOX 1598, BURLINGTON, NC 27216-1598
PO BOX 1599, BURLINGTON, NC 27216-1599
PO BOX 1600, BURLINGTON, NC 27216-1600
PO BOX 1601, BURLINGTON, NC 27216-1601
PO BOX 1602, BURLINGTON, NC 27216-1602
PO BOX 1603, BURLINGTON, NC 27216-1603
PO BOX 1604, BURLINGTON, NC 27216-1604
PO BOX 1605, BURLINGTON, NC 27216-1605
PO BOX 1606, BURLINGTON, NC 27216-1606
PO BOX 1607, BURLINGTON, NC 27216-1607
PO BOX 1608, BURLINGTON, NC 27216-1608
PO BOX 1609, BURLINGTON, NC 27216-1609
PO BOX 1610, BURLINGTON, NC 27216-1610
PO BOX 1611, BURLINGTON, NC 27216-1611
PO BOX 1612, BURLINGTON, NC 27216-1612
PO BOX 1613, BURLINGTON, NC 27216-1613
PO BOX 1614, BURLINGTON, NC 27216-1614
PO BOX 1615, BURLINGTON, NC 27216-1615
PO BOX 1616, BURLINGTON, NC 27216-1616
PO BOX 1617, BURLINGTON, NC 27216-1617
PO BOX 1618, BURLINGTON, NC 27216-1618
PO BOX 1619, BURLINGTON, NC 27216-1619
PO BOX 1620, BURLINGTON, NC 27216-1620
PO BOX 1621, BURLINGTON, NC 27216-1621
PO BOX 1622, BURLINGTON, NC 27216-1622
PO BOX 1623, BURLINGTON, NC 27216-1623
PO BOX 1624, BURLINGTON, NC 27216-1624
PO BOX 1625, BURLINGTON, NC 27216-1625
PO BOX 1626, BURLINGTON, NC 27216-1626
PO BOX 1627, BURLINGTON, NC 27216-1627
PO BOX 1628, BURLINGTON, NC 27216-1628
PO BOX 1629, BURLINGTON, NC 27216-1629
PO BOX 1630, BURLINGTON, NC 27216-1630
PO BOX 1631, BURLINGTON, NC 27216-1631
PO BOX 1632, BURLINGTON, NC 27216-1632
PO BOX 1633, BURLINGTON, NC 27216-1633
PO BOX 1634, BURLINGTON, NC 27216-1634
PO BOX 1635, BURLINGTON, NC 27216-1635
PO BOX 1636, BURLINGTON, NC 27216-1636
PO BOX 1637, BURLINGTON, NC 27216-1637
PO BOX 1638, BURLINGTON, NC 27216-1638
PO BOX 1639, BURLINGTON, NC 27216-1639
PO BOX 1640, BURLINGTON, NC 27216-1640
PO BOX 1641, BURLINGTON, NC 27216-1641
PO BOX 1642, BURLINGTON, NC 27216-1642
PO BOX 1643, BURLINGTON, NC 27216-1643
PO BOX 1644, BURLINGTON, NC 27216-1644
PO BOX 1645, BURLINGTON, NC 27216-1645
PO BOX 1646, BURLINGTON, NC 27216-1646
PO BOX 1647, BURLINGTON, NC 27216-1647
PO BOX 1648, BURLINGTON, NC 27216-1648
PO BOX 1649, BURLINGTON, NC 27216-1649
PO BOX 1650, BURLINGTON, NC 27216-1650
PO BOX 1651, BURLINGTON, NC 27216-1651
PO BOX 1652, BURLINGTON, NC 27216-1652
PO BOX 1653, BURLINGTON, NC 27216-1653
PO BOX 1654, BURLINGTON, NC 27216-1654
PO BOX 1655, BURLINGTON, NC 27216-1655
PO BOX 1656, BURLINGTON, NC 27216-1656
PO BOX 1657, BURLINGTON, NC 27216-1657
PO BOX 1658, BURLINGTON, NC 27216-1658
PO BOX 1659, BURLINGTON, NC 27216-1659
PO BOX 1660, BURLINGTON, NC 27216-1660
PO BOX 1661, BURLINGTON, NC 27216-1661
PO BOX 1662, BURLINGTON, NC 27216-1662
PO BOX 1663, BURLINGTON, NC 27216-1663
PO BOX 1664, BURLINGTON, NC 27216-1664
PO BOX 1665, BURLINGTON, NC 27216-1665
PO BOX 1666, BURLINGTON, NC 27216-1666
PO BOX 1667, BURLINGTON, NC 27216-1667
PO BOX 1668, BURLINGTON, NC 27216-1668
PO BOX 1669, BURLINGTON, NC 27216-1669
PO BOX 1670, BURLINGTON, NC 27216-1670
PO BOX 1671, BURLINGTON, NC 27216-1671
PO BOX 1672, BURLINGTON, NC 27216-1672
PO BOX 1673, BURLINGTON, NC 27216-1673
PO BOX 1674, BURLINGTON, NC 27216-1674
PO BOX 1675, BURLINGTON, NC 27216-1675
PO BOX 1676, BURLINGTON, NC 27216-1676
PO BOX 1677, BURLINGTON, NC 27216-1677
PO BOX 1678, BURLINGTON, NC 27216-1678
PO BOX 1679, BURLINGTON, NC 27216-1679
PO BOX 1680, BURLINGTON, NC 27216-1680
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