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, POWAY, CA 92074-1561
PO BOX 1562, POWAY, CA 92074-1562
PO BOX 1563, POWAY, CA 92074-1563
PO BOX 1564, POWAY, CA 92074-1564
PO BOX 1565, POWAY, CA 92074-1565
PO BOX 1566, POWAY, CA 92074-1566
PO BOX 1567, POWAY, CA 92074-1567
PO BOX 1568, POWAY, CA 92074-1568
PO BOX 1569, POWAY, CA 92074-1569
PO BOX 1570, POWAY, CA 92074-1570
PO BOX 1571, POWAY, CA 92074-1571
PO BOX 1572, POWAY, CA 92074-1572
PO BOX 1573, POWAY, CA 92074-1573
PO BOX 1574, POWAY, CA 92074-1574
PO BOX 1575, POWAY, CA 92074-1575
PO BOX 1576, POWAY, CA 92074-1576
PO BOX 1577, POWAY, CA 92074-1577
PO BOX 1578, POWAY, CA 92074-1578
PO BOX 1579, POWAY, CA 92074-1579
PO BOX 1580, POWAY, CA 92074-1580
PO BOX 1581, POWAY, CA 92074-1581
PO BOX 1582, POWAY, CA 92074-1582
PO BOX 1583, POWAY, CA 92074-1583
PO BOX 1584, POWAY, CA 92074-1584
PO BOX 1585, POWAY, CA 92074-1585
PO BOX 1586, POWAY, CA 92074-1586
PO BOX 1587, POWAY, CA 92074-1587
PO BOX 1588, POWAY, CA 92074-1588
PO BOX 1589, POWAY, CA 92074-1589
PO BOX 1590, POWAY, CA 92074-1590
PO BOX 1591, POWAY, CA 92074-1591
PO BOX 1592, POWAY, CA 92074-1592
PO BOX 1593, POWAY, CA 92074-1593
PO BOX 1594, POWAY, CA 92074-1594
PO BOX 1595, POWAY, CA 92074-1595
PO BOX 1596, POWAY, CA 92074-1596
PO BOX 1597, POWAY, CA 92074-1597
PO BOX 1598, POWAY, CA 92074-1598
PO BOX 1599, POWAY, CA 92074-1599
PO BOX 1600, POWAY, CA 92074-1600
PO BOX 1601, POWAY, CA 92074-1601
PO BOX 1602, POWAY, CA 92074-1602
PO BOX 1603, POWAY, CA 92074-1603
PO BOX 1604, POWAY, CA 92074-1604
PO BOX 1605, POWAY, CA 92074-1605
PO BOX 1606, POWAY, CA 92074-1606
PO BOX 1607, POWAY, CA 92074-1607
PO BOX 1608, POWAY, CA 92074-1608
PO BOX 1609, POWAY, CA 92074-1609
PO BOX 1610, POWAY, CA 92074-1610
PO BOX 1611, POWAY, CA 92074-1611
PO BOX 1612, POWAY, CA 92074-1612
PO BOX 1613, POWAY, CA 92074-1613
PO BOX 1614, POWAY, CA 92074-1614
PO BOX 1615, POWAY, CA 92074-1615
PO BOX 1616, POWAY, CA 92074-1616
PO BOX 1617, POWAY, CA 92074-1617
PO BOX 1618, POWAY, CA 92074-1618
PO BOX 1619, POWAY, CA 92074-1619
PO BOX 1620, POWAY, CA 92074-1620
PO BOX 1621, POWAY, CA 92074-1621
PO BOX 1622, POWAY, CA 92074-1622
PO BOX 1623, POWAY, CA 92074-1623
PO BOX 1624, POWAY, CA 92074-1624
PO BOX 1625, POWAY, CA 92074-1625
PO BOX 1626, POWAY, CA 92074-1626
PO BOX 1627, POWAY, CA 92074-1627
PO BOX 1628, POWAY, CA 92074-1628
PO BOX 1629, POWAY, CA 92074-1629
PO BOX 1630, POWAY, CA 92074-1630
PO BOX 1631, POWAY, CA 92074-1631
PO BOX 1632, POWAY, CA 92074-1632
PO BOX 1633, POWAY, CA 92074-1633
PO BOX 1634, POWAY, CA 92074-1634
PO BOX 1635, POWAY, CA 92074-1635
PO BOX 1636, POWAY, CA 92074-1636
PO BOX 1637, POWAY, CA 92074-1637
PO BOX 1638, POWAY, CA 92074-1638
PO BOX 1639, POWAY, CA 92074-1639
PO BOX 1640, POWAY, CA 92074-1640
PO BOX 1641, POWAY, CA 92074-1641
PO BOX 1642, POWAY, CA 92074-1642
PO BOX 1643, POWAY, CA 92074-1643
PO BOX 1644, POWAY, CA 92074-1644
PO BOX 1645, POWAY, CA 92074-1645
PO BOX 1646, POWAY, CA 92074-1646
PO BOX 1647, POWAY, CA 92074-1647
PO BOX 1648, POWAY, CA 92074-1648
PO BOX 1649, POWAY, CA 92074-1649
PO BOX 1650, POWAY, CA 92074-1650
PO BOX 1651, POWAY, CA 92074-1651
PO BOX 1652, POWAY, CA 92074-1652
PO BOX 1653, POWAY, CA 92074-1653
PO BOX 1654, POWAY, CA 92074-1654
PO BOX 1655, POWAY, CA 92074-1655
PO BOX 1656, POWAY, CA 92074-1656
PO BOX 1657, POWAY, CA 92074-1657
PO BOX 1658, POWAY, CA 92074-1658
PO BOX 1659, POWAY, CA 92074-1659
PO BOX 1660, POWAY, CA 92074-1660
PO BOX 1661, POWAY, CA 92074-1661
PO BOX 1662, POWAY, CA 92074-1662
PO BOX 1663, POWAY, CA 92074-1663
PO BOX 1664, POWAY, CA 92074-1664
PO BOX 1665, POWAY, CA 92074-1665
PO BOX 1666, POWAY, CA 92074-1666
PO BOX 1667, POWAY, CA 92074-1667
PO BOX 1668, POWAY, CA 92074-1668
PO BOX 1669, POWAY, CA 92074-1669
PO BOX 1670, POWAY, CA 92074-1670
PO BOX 1671, POWAY, CA 92074-1671
PO BOX 1672, POWAY, CA 92074-1672
PO BOX 1673, POWAY, CA 92074-1673
PO BOX 1674, POWAY, CA 92074-1674
PO BOX 1675, POWAY, CA 92074-1675
PO BOX 1676, POWAY, CA 92074-1676
PO BOX 1677, POWAY, CA 92074-1677
PO BOX 1678, POWAY, CA 92074-1678
PO BOX 1679, POWAY, CA 92074-1679
PO BOX 1680, POWAY, CA 92074-1680
PO BOX 1681, POWAY, CA 92074-1681
PO BOX 1682, POWAY, CA 92074-1682
PO BOX 1683, POWAY, CA 92074-1683
PO BOX 1684, POWAY, CA 92074-1684
PO BOX 1685, POWAY, CA 92074-1685
PO BOX 1686, POWAY, CA 92074-1686
PO BOX 1687, POWAY, CA 92074-1687
PO BOX 1688, POWAY, CA 92074-1688
PO BOX 1689, POWAY, CA 92074-1689
PO BOX 1690, POWAY, CA 92074-1690
PO BOX 1691, POWAY, CA 92074-1691
PO BOX 1692, POWAY, CA 92074-1692
PO BOX 1693, POWAY, CA 92074-1693
PO BOX 1694, POWAY, CA 92074-1694
PO BOX 1695, POWAY, CA 92074-1695
PO BOX 1696, POWAY, CA 92074-1696
PO BOX 1697, POWAY, CA 92074-1697
PO BOX 1698, POWAY, CA 92074-1698
PO BOX 1699, POWAY, CA 92074-1699
PO BOX 1700, POWAY, CA 92074-1700
PO BOX 1701, POWAY, CA 92074-1701
PO BOX 1702, POWAY, CA 92074-1702
PO BOX 1703, POWAY, CA 92074-1703
PO BOX 1704, POWAY, CA 92074-1704
PO BOX 1705, POWAY, CA 92074-1705
PO BOX 1706, POWAY, CA 92074-1706
PO BOX 1707, POWAY, CA 92074-1707
PO BOX 1708, POWAY, CA 92074-1708
PO BOX 1709, POWAY, CA 92074-1709
PO BOX 1710, POWAY, CA 92074-1710
PO BOX 1711, POWAY, CA 92074-1711
PO BOX 1712, POWAY, CA 92074-1712
PO BOX 1713, POWAY, CA 92074-1713
PO BOX 1714, POWAY, CA 92074-1714
PO BOX 1715, POWAY, CA 92074-1715
PO BOX 1716, POWAY, CA 92074-1716
PO BOX 1717, POWAY, CA 92074-1717
PO BOX 1718, POWAY, CA 92074-1718
PO BOX 1719, POWAY, CA 92074-1719
PO BOX 1720, POWAY, CA 92074-1720
PO BOX 1721, POWAY, CA 92074-1721
PO BOX 1722, POWAY, CA 92074-1722
PO BOX 1723, POWAY, CA 92074-1723
PO BOX 1724, POWAY, CA 92074-1724
PO BOX 1725, POWAY, CA 92074-1725
PO BOX 1726, POWAY, CA 92074-1726
PO BOX 1727, POWAY, CA 92074-1727
PO BOX 1728, POWAY, CA 92074-1728
PO BOX 1729, POWAY, CA 92074-1729
PO BOX 1730, POWAY, CA 92074-1730
PO BOX 1731, POWAY, CA 92074-1731
PO BOX 1732, POWAY, CA 92074-1732
PO BOX 1733, POWAY, CA 92074-1733
PO BOX 1734, POWAY, CA 92074-1734
PO BOX 1735, POWAY, CA 92074-1735
PO BOX 1736, POWAY, CA 92074-1736
PO BOX 1737, POWAY, CA 92074-1737
PO BOX 1738, POWAY, CA 92074-1738
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