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, WESTMINSTER, CA 92684-1601
PO BOX 1602, WESTMINSTER, CA 92684-1602
PO BOX 1603, WESTMINSTER, CA 92684-1603
PO BOX 1604, WESTMINSTER, CA 92684-1604
PO BOX 1605, WESTMINSTER, CA 92684-1605
PO BOX 1606, WESTMINSTER, CA 92684-1606
PO BOX 1607, WESTMINSTER, CA 92684-1607
PO BOX 1608, WESTMINSTER, CA 92684-1608
PO BOX 1609, WESTMINSTER, CA 92684-1609
PO BOX 1610, WESTMINSTER, CA 92684-1610
PO BOX 1611, WESTMINSTER, CA 92684-1611
PO BOX 1612, WESTMINSTER, CA 92684-1612
PO BOX 1613, WESTMINSTER, CA 92684-1613
PO BOX 1614, WESTMINSTER, CA 92684-1614
PO BOX 1615, WESTMINSTER, CA 92684-1615
PO BOX 1616, WESTMINSTER, CA 92684-1616
PO BOX 1617, WESTMINSTER, CA 92684-1617
PO BOX 1618, WESTMINSTER, CA 92684-1618
PO BOX 1619, WESTMINSTER, CA 92684-1619
PO BOX 1620, WESTMINSTER, CA 92684-1620
PO BOX 1621, WESTMINSTER, CA 92684-1621
PO BOX 1622, WESTMINSTER, CA 92684-1622
PO BOX 1623, WESTMINSTER, CA 92684-1623
PO BOX 1624, WESTMINSTER, CA 92684-1624
PO BOX 1625, WESTMINSTER, CA 92684-1625
PO BOX 1626, WESTMINSTER, CA 92684-1626
PO BOX 1627, WESTMINSTER, CA 92684-1627
PO BOX 1628, WESTMINSTER, CA 92684-1628
PO BOX 1629, WESTMINSTER, CA 92684-1629
PO BOX 1630, WESTMINSTER, CA 92684-1630
PO BOX 1631, WESTMINSTER, CA 92684-1631
PO BOX 1632, WESTMINSTER, CA 92684-1632
PO BOX 1633, WESTMINSTER, CA 92684-1633
PO BOX 1634, WESTMINSTER, CA 92684-1634
PO BOX 1635, WESTMINSTER, CA 92684-1635
PO BOX 1636, WESTMINSTER, CA 92684-1636
PO BOX 1637, WESTMINSTER, CA 92684-1637
PO BOX 1638, WESTMINSTER, CA 92684-1638
PO BOX 1639, WESTMINSTER, CA 92684-1639
PO BOX 1640, WESTMINSTER, CA 92684-1640
PO BOX 1641, WESTMINSTER, CA 92684-1641
PO BOX 1642, WESTMINSTER, CA 92684-1642
PO BOX 1643, WESTMINSTER, CA 92684-1643
PO BOX 1644, WESTMINSTER, CA 92684-1644
PO BOX 1645, WESTMINSTER, CA 92684-1645
PO BOX 1646, WESTMINSTER, CA 92684-1646
PO BOX 1647, WESTMINSTER, CA 92684-1647
PO BOX 1648, WESTMINSTER, CA 92684-1648
PO BOX 1649, WESTMINSTER, CA 92684-1649
PO BOX 1650, WESTMINSTER, CA 92684-1650
PO BOX 1651, WESTMINSTER, CA 92684-1651
PO BOX 1652, WESTMINSTER, CA 92684-1652
PO BOX 1653, WESTMINSTER, CA 92684-1653
PO BOX 1654, WESTMINSTER, CA 92684-1654
PO BOX 1655, WESTMINSTER, CA 92684-1655
PO BOX 1656, WESTMINSTER, CA 92684-1656
PO BOX 1657, WESTMINSTER, CA 92684-1657
PO BOX 1658, WESTMINSTER, CA 92684-1658
PO BOX 1659, WESTMINSTER, CA 92684-1659
PO BOX 1660, WESTMINSTER, CA 92684-1660
PO BOX 1661, WESTMINSTER, CA 92684-1661
PO BOX 1662, WESTMINSTER, CA 92684-1662
PO BOX 1663, WESTMINSTER, CA 92684-1663
PO BOX 1664, WESTMINSTER, CA 92684-1664
PO BOX 1665, WESTMINSTER, CA 92684-1665
PO BOX 1666, WESTMINSTER, CA 92684-1666
PO BOX 1667, WESTMINSTER, CA 92684-1667
PO BOX 1668, WESTMINSTER, CA 92684-1668
PO BOX 1669, WESTMINSTER, CA 92684-1669
PO BOX 1670, WESTMINSTER, CA 92684-1670
PO BOX 1671, WESTMINSTER, CA 92684-1671
PO BOX 1672, WESTMINSTER, CA 92684-1672
PO BOX 1673, WESTMINSTER, CA 92684-1673
PO BOX 1674, WESTMINSTER, CA 92684-1674
PO BOX 1675, WESTMINSTER, CA 92684-1675
PO BOX 1676, WESTMINSTER, CA 92684-1676
PO BOX 1677, WESTMINSTER, CA 92684-1677
PO BOX 1678, WESTMINSTER, CA 92684-1678
PO BOX 1679, WESTMINSTER, CA 92684-1679
PO BOX 1680, WESTMINSTER, CA 92684-1680
PO BOX 1681, WESTMINSTER, CA 92684-1681
PO BOX 1682, WESTMINSTER, CA 92684-1682
PO BOX 1683, WESTMINSTER, CA 92684-1683
PO BOX 1684, WESTMINSTER, CA 92684-1684
PO BOX 1685, WESTMINSTER, CA 92684-1685
PO BOX 1686, WESTMINSTER, CA 92684-1686
PO BOX 1687, WESTMINSTER, CA 92684-1687
PO BOX 1688, WESTMINSTER, CA 92684-1688
PO BOX 1689, WESTMINSTER, CA 92684-1689
PO BOX 1690, WESTMINSTER, CA 92684-1690
PO BOX 1691, WESTMINSTER, CA 92684-1691
PO BOX 1692, WESTMINSTER, CA 92684-1692
PO BOX 1693, WESTMINSTER, CA 92684-1693
PO BOX 1694, WESTMINSTER, CA 92684-1694
PO BOX 1695, WESTMINSTER, CA 92684-1695
PO BOX 1696, WESTMINSTER, CA 92684-1696
PO BOX 1697, WESTMINSTER, CA 92684-1697
PO BOX 1698, WESTMINSTER, CA 92684-1698
PO BOX 1699, WESTMINSTER, CA 92684-1699
PO BOX 1700, WESTMINSTER, CA 92684-1700
PO BOX 1701, WESTMINSTER, CA 92684-1701
PO BOX 1702, WESTMINSTER, CA 92684-1702
PO BOX 1703, WESTMINSTER, CA 92684-1703
PO BOX 1704, WESTMINSTER, CA 92684-1704
PO BOX 1705, WESTMINSTER, CA 92684-1705
PO BOX 1706, WESTMINSTER, CA 92684-1706
PO BOX 1707, WESTMINSTER, CA 92684-1707
PO BOX 1708, WESTMINSTER, CA 92684-1708
PO BOX 1709, WESTMINSTER, CA 92684-1709
PO BOX 1710, WESTMINSTER, CA 92684-1710
PO BOX 1711, WESTMINSTER, CA 92684-1711
PO BOX 1712, WESTMINSTER, CA 92684-1712
PO BOX 1713, WESTMINSTER, CA 92684-1713
PO BOX 1714, WESTMINSTER, CA 92684-1714
PO BOX 1715, WESTMINSTER, CA 92684-1715
PO BOX 1716, WESTMINSTER, CA 92684-1716
PO BOX 1717, WESTMINSTER, CA 92684-1717
PO BOX 1718, WESTMINSTER, CA 92684-1718
PO BOX 1719, WESTMINSTER, CA 92684-1719
PO BOX 1720, WESTMINSTER, CA 92684-1720
PO BOX 1721, WESTMINSTER, CA 92684-1721
PO BOX 1722, WESTMINSTER, CA 92684-1722
PO BOX 1723, WESTMINSTER, CA 92684-1723
PO BOX 1724, WESTMINSTER, CA 92684-1724
PO BOX 1725, WESTMINSTER, CA 92684-1725
PO BOX 1726, WESTMINSTER, CA 92684-1726
PO BOX 1727, WESTMINSTER, CA 92684-1727
PO BOX 1728, WESTMINSTER, CA 92684-1728
PO BOX 1729, WESTMINSTER, CA 92684-1729
PO BOX 1730, WESTMINSTER, CA 92684-1730
PO BOX 1731, WESTMINSTER, CA 92684-1731
PO BOX 1732, WESTMINSTER, CA 92684-1732
PO BOX 1733, WESTMINSTER, CA 92684-1733
PO BOX 1734, WESTMINSTER, CA 92684-1734
PO BOX 1735, WESTMINSTER, CA 92684-1735
PO BOX 1736, WESTMINSTER, CA 92684-1736
PO BOX 1737, WESTMINSTER, CA 92684-1737
PO BOX 1738, WESTMINSTER, CA 92684-1738
PO BOX 1739, WESTMINSTER, CA 92684-1739
PO BOX 1740, WESTMINSTER, CA 92684-1740
PO BOX 1741, WESTMINSTER, CA 92684-1741
PO BOX 1742, WESTMINSTER, CA 92684-1742
PO BOX 1743, WESTMINSTER, CA 92684-1743
PO BOX 1744, WESTMINSTER, CA 92684-1744
PO BOX 1745, WESTMINSTER, CA 92684-1745
PO BOX 1746, WESTMINSTER, CA 92684-1746
PO BOX 1747, WESTMINSTER, CA 92684-1747
PO BOX 1748, WESTMINSTER, CA 92684-1748
PO BOX 1749, WESTMINSTER, CA 92684-1749
PO BOX 1750, WESTMINSTER, CA 92684-1750
PO BOX 1751, WESTMINSTER, CA 92684-1751
PO BOX 1752, WESTMINSTER, CA 92684-1752
PO BOX 1753, WESTMINSTER, CA 92684-1753
PO BOX 1754, WESTMINSTER, CA 92684-1754
PO BOX 1755, WESTMINSTER, CA 92684-1755
PO BOX 1756, WESTMINSTER, CA 92684-1756
PO BOX 1757, WESTMINSTER, CA 92684-1757
PO BOX 1758, WESTMINSTER, CA 92684-1758
PO BOX 1759, WESTMINSTER, CA 92684-1759
PO BOX 1760, WESTMINSTER, CA 92684-1760
PO BOX 1761, WESTMINSTER, CA 92684-1761
PO BOX 1762, WESTMINSTER, CA 92684-1762
PO BOX 1763, WESTMINSTER, CA 92684-1763
PO BOX 1764, WESTMINSTER, CA 92684-1764
PO BOX 1765, WESTMINSTER, CA 92684-1765
PO BOX 1766, WESTMINSTER, CA 92684-1766
PO BOX 1767, WESTMINSTER, CA 92684-1767
PO BOX 1768, WESTMINSTER, CA 92684-1768
PO BOX 1769, WESTMINSTER, CA 92684-1769
PO BOX 1770, WESTMINSTER, CA 92684-1770
PO BOX 1771, WESTMINSTER, CA 92684-1771
PO BOX 1772, WESTMINSTER, CA 92684-1772
PO BOX 1773, WESTMINSTER, CA 92684-1773
PO BOX 1774, WESTMINSTER, CA 92684-1774
PO BOX 1775, WESTMINSTER, CA 92684-1775
PO BOX 1776, WESTMINSTER, CA 92684-1776
PO BOX 1777, WESTMINSTER, CA 92684-1777
PO BOX 1778, WESTMINSTER, CA 92684-1778
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