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 1601, VALLEY CENTER, CA 92082-1601
PO BOX 1602, VALLEY CENTER, CA 92082-1602
PO BOX 1603, VALLEY CENTER, CA 92082-1603
PO BOX 1604, VALLEY CENTER, CA 92082-1604
PO BOX 1605, VALLEY CENTER, CA 92082-1605
PO BOX 1606, VALLEY CENTER, CA 92082-1606
PO BOX 1607, VALLEY CENTER, CA 92082-1607
PO BOX 1608, VALLEY CENTER, CA 92082-1608
PO BOX 1609, VALLEY CENTER, CA 92082-1609
PO BOX 1610, VALLEY CENTER, CA 92082-1610
PO BOX 1611, VALLEY CENTER, CA 92082-1611
PO BOX 1612, VALLEY CENTER, CA 92082-1612
PO BOX 1613, VALLEY CENTER, CA 92082-1613
PO BOX 1614, VALLEY CENTER, CA 92082-1614
PO BOX 1615, VALLEY CENTER, CA 92082-1615
PO BOX 1616, VALLEY CENTER, CA 92082-1616
PO BOX 1617, VALLEY CENTER, CA 92082-1617
PO BOX 1618, VALLEY CENTER, CA 92082-1618
PO BOX 1619, VALLEY CENTER, CA 92082-1619
PO BOX 1620, VALLEY CENTER, CA 92082-1620
PO BOX 1621, VALLEY CENTER, CA 92082-1621
PO BOX 1622, VALLEY CENTER, CA 92082-1622
PO BOX 1623, VALLEY CENTER, CA 92082-1623
PO BOX 1624, VALLEY CENTER, CA 92082-1624
PO BOX 1625, VALLEY CENTER, CA 92082-1625
PO BOX 1626, VALLEY CENTER, CA 92082-1626
PO BOX 1627, VALLEY CENTER, CA 92082-1627
PO BOX 1628, VALLEY CENTER, CA 92082-1628
PO BOX 1629, VALLEY CENTER, CA 92082-1629
PO BOX 1630, VALLEY CENTER, CA 92082-1630
PO BOX 1631, VALLEY CENTER, CA 92082-1631
PO BOX 1632, VALLEY CENTER, CA 92082-1632
PO BOX 1633, VALLEY CENTER, CA 92082-1633
PO BOX 1634, VALLEY CENTER, CA 92082-1634
PO BOX 1635, VALLEY CENTER, CA 92082-1635
PO BOX 1636, VALLEY CENTER, CA 92082-1636
PO BOX 1637, VALLEY CENTER, CA 92082-1637
PO BOX 1638, VALLEY CENTER, CA 92082-1638
PO BOX 1639, VALLEY CENTER, CA 92082-1639
PO BOX 1640, VALLEY CENTER, CA 92082-1640
PO BOX 1641, VALLEY CENTER, CA 92082-1641
PO BOX 1642, VALLEY CENTER, CA 92082-1642
PO BOX 1643, VALLEY CENTER, CA 92082-1643
PO BOX 1644, VALLEY CENTER, CA 92082-1644
PO BOX 1645, VALLEY CENTER, CA 92082-1645
PO BOX 1646, VALLEY CENTER, CA 92082-1646
PO BOX 1647, VALLEY CENTER, CA 92082-1647
PO BOX 1648, VALLEY CENTER, CA 92082-1648
PO BOX 1649, VALLEY CENTER, CA 92082-1649
PO BOX 1650, VALLEY CENTER, CA 92082-1650
PO BOX 1651, VALLEY CENTER, CA 92082-1651
PO BOX 1652, VALLEY CENTER, CA 92082-1652
PO BOX 1653, VALLEY CENTER, CA 92082-1653
PO BOX 1654, VALLEY CENTER, CA 92082-1654
PO BOX 1655, VALLEY CENTER, CA 92082-1655
PO BOX 1656, VALLEY CENTER, CA 92082-1656
PO BOX 1657, VALLEY CENTER, CA 92082-1657
PO BOX 1658, VALLEY CENTER, CA 92082-1658
PO BOX 1659, VALLEY CENTER, CA 92082-1659
PO BOX 1660, VALLEY CENTER, CA 92082-1660
PO BOX 1661, VALLEY CENTER, CA 92082-1661
PO BOX 1662, VALLEY CENTER, CA 92082-1662
PO BOX 1663, VALLEY CENTER, CA 92082-1663
PO BOX 1664, VALLEY CENTER, CA 92082-1664
PO BOX 1665, VALLEY CENTER, CA 92082-1665
PO BOX 1666, VALLEY CENTER, CA 92082-1666
PO BOX 1667, VALLEY CENTER, CA 92082-1667
PO BOX 1668, VALLEY CENTER, CA 92082-1668
PO BOX 1669, VALLEY CENTER, CA 92082-1669
PO BOX 1670, VALLEY CENTER, CA 92082-1670
PO BOX 1671, VALLEY CENTER, CA 92082-1671
PO BOX 1672, VALLEY CENTER, CA 92082-1672
PO BOX 1673, VALLEY CENTER, CA 92082-1673
PO BOX 1674, VALLEY CENTER, CA 92082-1674
PO BOX 1675, VALLEY CENTER, CA 92082-1675
PO BOX 1676, VALLEY CENTER, CA 92082-1676
PO BOX 1677, VALLEY CENTER, CA 92082-1677
PO BOX 1678, VALLEY CENTER, CA 92082-1678
PO BOX 1679, VALLEY CENTER, CA 92082-1679
PO BOX 1680, VALLEY CENTER, CA 92082-1680
PO BOX 1681, VALLEY CENTER, CA 92082-1681
PO BOX 1682, VALLEY CENTER, CA 92082-1682
PO BOX 1683, VALLEY CENTER, CA 92082-1683
PO BOX 1684, VALLEY CENTER, CA 92082-1684
PO BOX 1685, VALLEY CENTER, CA 92082-1685
PO BOX 1686, VALLEY CENTER, CA 92082-1686
PO BOX 1687, VALLEY CENTER, CA 92082-1687
PO BOX 1688, VALLEY CENTER, CA 92082-1688
PO BOX 1689, VALLEY CENTER, CA 92082-1689
PO BOX 1690, VALLEY CENTER, CA 92082-1690
PO BOX 1691, VALLEY CENTER, CA 92082-1691
PO BOX 1692, VALLEY CENTER, CA 92082-1692
PO BOX 1693, VALLEY CENTER, CA 92082-1693
PO BOX 1694, VALLEY CENTER, CA 92082-1694
PO BOX 1695, VALLEY CENTER, CA 92082-1695
PO BOX 1696, VALLEY CENTER, CA 92082-1696
PO BOX 1697, VALLEY CENTER, CA 92082-1697
PO BOX 1698, VALLEY CENTER, CA 92082-1698
PO BOX 1699, VALLEY CENTER, CA 92082-1699
PO BOX 1700, VALLEY CENTER, CA 92082-1700
PO BOX 1701, VALLEY CENTER, CA 92082-1701
PO BOX 1702, VALLEY CENTER, CA 92082-1702
PO BOX 1703, VALLEY CENTER, CA 92082-1703
PO BOX 1704, VALLEY CENTER, CA 92082-1704
PO BOX 1705, VALLEY CENTER, CA 92082-1705
PO BOX 1706, VALLEY CENTER, CA 92082-1706
PO BOX 1707, VALLEY CENTER, CA 92082-1707
PO BOX 1708, VALLEY CENTER, CA 92082-1708
PO BOX 1709, VALLEY CENTER, CA 92082-1709
PO BOX 1710, VALLEY CENTER, CA 92082-1710
PO BOX 1711, VALLEY CENTER, CA 92082-1711
PO BOX 1712, VALLEY CENTER, CA 92082-1712
PO BOX 1713, VALLEY CENTER, CA 92082-1713
PO BOX 1714, VALLEY CENTER, CA 92082-1714
PO BOX 1715, VALLEY CENTER, CA 92082-1715
PO BOX 1716, VALLEY CENTER, CA 92082-1716
PO BOX 1717, VALLEY CENTER, CA 92082-1717
PO BOX 1718, VALLEY CENTER, CA 92082-1718
PO BOX 1719, VALLEY CENTER, CA 92082-1719
PO BOX 1720, VALLEY CENTER, CA 92082-1720
PO BOX 1721, VALLEY CENTER, CA 92082-1721
PO BOX 1722, VALLEY CENTER, CA 92082-1722
PO BOX 1723, VALLEY CENTER, CA 92082-1723
PO BOX 1724, VALLEY CENTER, CA 92082-1724
PO BOX 1725, VALLEY CENTER, CA 92082-1725
PO BOX 1726, VALLEY CENTER, CA 92082-1726
PO BOX 1727, VALLEY CENTER, CA 92082-1727
PO BOX 1728, VALLEY CENTER, CA 92082-1728
PO BOX 1729, VALLEY CENTER, CA 92082-1729
PO BOX 1730, VALLEY CENTER, CA 92082-1730
PO BOX 1731, VALLEY CENTER, CA 92082-1731
PO BOX 1732, VALLEY CENTER, CA 92082-1732
PO BOX 1733, VALLEY CENTER, CA 92082-1733
PO BOX 1734, VALLEY CENTER, CA 92082-1734
PO BOX 1735, VALLEY CENTER, CA 92082-1735
PO BOX 1736, VALLEY CENTER, CA 92082-1736
PO BOX 1737, VALLEY CENTER, CA 92082-1737
PO BOX 1738, VALLEY CENTER, CA 92082-1738
PO BOX 1739, VALLEY CENTER, CA 92082-1739
PO BOX 1740, VALLEY CENTER, CA 92082-1740
PO BOX 1741, VALLEY CENTER, CA 92082-1741
PO BOX 1742, VALLEY CENTER, CA 92082-1742
PO BOX 1743, VALLEY CENTER, CA 92082-1743
PO BOX 1744, VALLEY CENTER, CA 92082-1744
PO BOX 1745, VALLEY CENTER, CA 92082-1745
PO BOX 1746, VALLEY CENTER, CA 92082-1746
PO BOX 1747, VALLEY CENTER, CA 92082-1747
PO BOX 1748, VALLEY CENTER, CA 92082-1748
PO BOX 1749, VALLEY CENTER, CA 92082-1749
PO BOX 1750, VALLEY CENTER, CA 92082-1750
PO BOX 1751, VALLEY CENTER, CA 92082-1751
PO BOX 1752, VALLEY CENTER, CA 92082-1752
PO BOX 1753, VALLEY CENTER, CA 92082-1753
PO BOX 1754, VALLEY CENTER, CA 92082-1754
PO BOX 1755, VALLEY CENTER, CA 92082-1755
PO BOX 1756, VALLEY CENTER, CA 92082-1756
PO BOX 1757, VALLEY CENTER, CA 92082-1757
PO BOX 1758, VALLEY CENTER, CA 92082-1758
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