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 1561, ROCKINGHAM, NC 28380-1561
PO BOX 1562, ROCKINGHAM, NC 28380-1562
PO BOX 1563, ROCKINGHAM, NC 28380-1563
PO BOX 1564, ROCKINGHAM, NC 28380-1564
PO BOX 1565, ROCKINGHAM, NC 28380-1565
PO BOX 1566, ROCKINGHAM, NC 28380-1566
PO BOX 1567, ROCKINGHAM, NC 28380-1567
PO BOX 1568, ROCKINGHAM, NC 28380-1568
PO BOX 1569, ROCKINGHAM, NC 28380-1569
PO BOX 1570, ROCKINGHAM, NC 28380-1570
PO BOX 1571, ROCKINGHAM, NC 28380-1571
PO BOX 1572, ROCKINGHAM, NC 28380-1572
PO BOX 1573, ROCKINGHAM, NC 28380-1573
PO BOX 1574, ROCKINGHAM, NC 28380-1574
PO BOX 1575, ROCKINGHAM, NC 28380-1575
PO BOX 1576, ROCKINGHAM, NC 28380-1576
PO BOX 1577, ROCKINGHAM, NC 28380-1577
PO BOX 1578, ROCKINGHAM, NC 28380-1578
PO BOX 1579, ROCKINGHAM, NC 28380-1579
PO BOX 1580, ROCKINGHAM, NC 28380-1580
PO BOX 1581, ROCKINGHAM, NC 28380-1581
PO BOX 1582, ROCKINGHAM, NC 28380-1582
PO BOX 1583, ROCKINGHAM, NC 28380-1583
PO BOX 1584, ROCKINGHAM, NC 28380-1584
PO BOX 1585, ROCKINGHAM, NC 28380-1585
PO BOX 1586, ROCKINGHAM, NC 28380-1586
PO BOX 1587, ROCKINGHAM, NC 28380-1587
PO BOX 1588, ROCKINGHAM, NC 28380-1588
PO BOX 1589, ROCKINGHAM, NC 28380-1589
PO BOX 1590, ROCKINGHAM, NC 28380-1590
PO BOX 1591, ROCKINGHAM, NC 28380-1591
PO BOX 1592, ROCKINGHAM, NC 28380-1592
PO BOX 1593, ROCKINGHAM, NC 28380-1593
PO BOX 1594, ROCKINGHAM, NC 28380-1594
PO BOX 1595, ROCKINGHAM, NC 28380-1595
PO BOX 1596, ROCKINGHAM, NC 28380-1596
PO BOX 1597, ROCKINGHAM, NC 28380-1597
PO BOX 1598, ROCKINGHAM, NC 28380-1598
PO BOX 1599, ROCKINGHAM, NC 28380-1599
PO BOX 1600, ROCKINGHAM, NC 28380-1600
PO BOX 1601, ROCKINGHAM, NC 28380-1601
PO BOX 1602, ROCKINGHAM, NC 28380-1602
PO BOX 1603, ROCKINGHAM, NC 28380-1603
PO BOX 1604, ROCKINGHAM, NC 28380-1604
PO BOX 1605, ROCKINGHAM, NC 28380-1605
PO BOX 1606, ROCKINGHAM, NC 28380-1606
PO BOX 1607, ROCKINGHAM, NC 28380-1607
PO BOX 1608, ROCKINGHAM, NC 28380-1608
PO BOX 1609, ROCKINGHAM, NC 28380-1609
PO BOX 1610, ROCKINGHAM, NC 28380-1610
PO BOX 1611, ROCKINGHAM, NC 28380-1611
PO BOX 1612, ROCKINGHAM, NC 28380-1612
PO BOX 1613, ROCKINGHAM, NC 28380-1613
PO BOX 1614, ROCKINGHAM, NC 28380-1614
PO BOX 1615, ROCKINGHAM, NC 28380-1615
PO BOX 1616, ROCKINGHAM, NC 28380-1616
PO BOX 1617, ROCKINGHAM, NC 28380-1617
PO BOX 1618, ROCKINGHAM, NC 28380-1618
PO BOX 1619, ROCKINGHAM, NC 28380-1619
PO BOX 1620, ROCKINGHAM, NC 28380-1620
PO BOX 1621, ROCKINGHAM, NC 28380-1621
PO BOX 1622, ROCKINGHAM, NC 28380-1622
PO BOX 1623, ROCKINGHAM, NC 28380-1623
PO BOX 1624, ROCKINGHAM, NC 28380-1624
PO BOX 1625, ROCKINGHAM, NC 28380-1625
PO BOX 1626, ROCKINGHAM, NC 28380-1626
PO BOX 1627, ROCKINGHAM, NC 28380-1627
PO BOX 1628, ROCKINGHAM, NC 28380-1628
PO BOX 1629, ROCKINGHAM, NC 28380-1629
PO BOX 1630, ROCKINGHAM, NC 28380-1630
PO BOX 1631, ROCKINGHAM, NC 28380-1631
PO BOX 1632, ROCKINGHAM, NC 28380-1632
PO BOX 1633, ROCKINGHAM, NC 28380-1633
PO BOX 1634, ROCKINGHAM, NC 28380-1634
PO BOX 1635, ROCKINGHAM, NC 28380-1635
PO BOX 1636, ROCKINGHAM, NC 28380-1636
PO BOX 1637, ROCKINGHAM, NC 28380-1637
PO BOX 1638, ROCKINGHAM, NC 28380-1638
PO BOX 1639, ROCKINGHAM, NC 28380-1639
PO BOX 1640, ROCKINGHAM, NC 28380-1640
PO BOX 1641, ROCKINGHAM, NC 28380-1641
PO BOX 1642, ROCKINGHAM, NC 28380-1642
PO BOX 1643, ROCKINGHAM, NC 28380-1643
PO BOX 1644, ROCKINGHAM, NC 28380-1644
PO BOX 1645, ROCKINGHAM, NC 28380-1645
PO BOX 1646, ROCKINGHAM, NC 28380-1646
PO BOX 1647, ROCKINGHAM, NC 28380-1647
PO BOX 1648, ROCKINGHAM, NC 28380-1648
PO BOX 1649, ROCKINGHAM, NC 28380-1649
PO BOX 1650, ROCKINGHAM, NC 28380-1650
PO BOX 1651, ROCKINGHAM, NC 28380-1651
PO BOX 1652, ROCKINGHAM, NC 28380-1652
PO BOX 1653, ROCKINGHAM, NC 28380-1653
PO BOX 1654, ROCKINGHAM, NC 28380-1654
PO BOX 1655, ROCKINGHAM, NC 28380-1655
PO BOX 1656, ROCKINGHAM, NC 28380-1656
PO BOX 1657, ROCKINGHAM, NC 28380-1657
PO BOX 1658, ROCKINGHAM, NC 28380-1658
PO BOX 1659, ROCKINGHAM, NC 28380-1659
PO BOX 1660, ROCKINGHAM, NC 28380-1660
PO BOX 1661, ROCKINGHAM, NC 28380-1661
PO BOX 1662, ROCKINGHAM, NC 28380-1662
PO BOX 1663, ROCKINGHAM, NC 28380-1663
PO BOX 1664, ROCKINGHAM, NC 28380-1664
PO BOX 1665, ROCKINGHAM, NC 28380-1665
PO BOX 1666, ROCKINGHAM, NC 28380-1666
PO BOX 1667, ROCKINGHAM, NC 28380-1667
PO BOX 1668, ROCKINGHAM, NC 28380-1668
PO BOX 1669, ROCKINGHAM, NC 28380-1669
PO BOX 1670, ROCKINGHAM, NC 28380-1670
PO BOX 1671, ROCKINGHAM, NC 28380-1671
PO BOX 1672, ROCKINGHAM, NC 28380-1672
PO BOX 1673, ROCKINGHAM, NC 28380-1673
PO BOX 1674, ROCKINGHAM, NC 28380-1674
PO BOX 1675, ROCKINGHAM, NC 28380-1675
PO BOX 1676, ROCKINGHAM, NC 28380-1676
PO BOX 1677, ROCKINGHAM, NC 28380-1677
PO BOX 1678, ROCKINGHAM, NC 28380-1678
PO BOX 1679, ROCKINGHAM, NC 28380-1679
PO BOX 1680, ROCKINGHAM, NC 28380-1680
PO BOX 1681, ROCKINGHAM, NC 28380-1681
PO BOX 1682, ROCKINGHAM, NC 28380-1682
PO BOX 1683, ROCKINGHAM, NC 28380-1683
PO BOX 1684, ROCKINGHAM, NC 28380-1684
PO BOX 1685, ROCKINGHAM, NC 28380-1685
PO BOX 1686, ROCKINGHAM, NC 28380-1686
PO BOX 1687, ROCKINGHAM, NC 28380-1687
PO BOX 1688, ROCKINGHAM, NC 28380-1688
PO BOX 1689, ROCKINGHAM, NC 28380-1689
PO BOX 1690, ROCKINGHAM, NC 28380-1690
PO BOX 1691, ROCKINGHAM, NC 28380-1691
PO BOX 1692, ROCKINGHAM, NC 28380-1692
PO BOX 1693, ROCKINGHAM, NC 28380-1693
PO BOX 1694, ROCKINGHAM, NC 28380-1694
PO BOX 1695, ROCKINGHAM, NC 28380-1695
PO BOX 1696, ROCKINGHAM, NC 28380-1696
PO BOX 1697, ROCKINGHAM, NC 28380-1697
PO BOX 1698, ROCKINGHAM, NC 28380-1698
PO BOX 1699, ROCKINGHAM, NC 28380-1699
PO BOX 1700, ROCKINGHAM, NC 28380-1700
PO BOX 1701, ROCKINGHAM, NC 28380-1701
PO BOX 1702, ROCKINGHAM, NC 28380-1702
PO BOX 1703, ROCKINGHAM, NC 28380-1703
PO BOX 1704, ROCKINGHAM, NC 28380-1704
PO BOX 1705, ROCKINGHAM, NC 28380-1705
PO BOX 1706, ROCKINGHAM, NC 28380-1706
PO BOX 1707, ROCKINGHAM, NC 28380-1707
PO BOX 1708, ROCKINGHAM, NC 28380-1708
PO BOX 1709, ROCKINGHAM, NC 28380-1709
PO BOX 1710, ROCKINGHAM, NC 28380-1710
PO BOX 1711, ROCKINGHAM, NC 28380-1711
PO BOX 1712, ROCKINGHAM, NC 28380-1712
PO BOX 1713, ROCKINGHAM, NC 28380-1713
PO BOX 1714, ROCKINGHAM, NC 28380-1714
PO BOX 1715, ROCKINGHAM, NC 28380-1715
PO BOX 1716, ROCKINGHAM, NC 28380-1716
PO BOX 1717, ROCKINGHAM, NC 28380-1717
PO BOX 1718, ROCKINGHAM, NC 28380-1718
PO BOX 1719, ROCKINGHAM, NC 28380-1719
PO BOX 1720, ROCKINGHAM, NC 28380-1720
PO BOX 1721, ROCKINGHAM, NC 28380-1721
PO BOX 1722, ROCKINGHAM, NC 28380-1722
PO BOX 1723, ROCKINGHAM, NC 28380-1723
PO BOX 1724, ROCKINGHAM, NC 28380-1724
PO BOX 1725, ROCKINGHAM, NC 28380-1725
PO BOX 1726, ROCKINGHAM, NC 28380-1726
PO BOX 1727, ROCKINGHAM, NC 28380-1727
PO BOX 1728, ROCKINGHAM, NC 28380-1728
PO BOX 1729, ROCKINGHAM, NC 28380-1729
PO BOX 1730, ROCKINGHAM, NC 28380-1730
PO BOX 1731, ROCKINGHAM, NC 28380-1731
PO BOX 1732, ROCKINGHAM, NC 28380-1732
PO BOX 1733, ROCKINGHAM, NC 28380-1733
PO BOX 1734, ROCKINGHAM, NC 28380-1734
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