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 1626, IDAHO FALLS, ID 83403-1626
PO BOX 1627, IDAHO FALLS, ID 83403-1627
PO BOX 1628, IDAHO FALLS, ID 83403-1628
PO BOX 1629, IDAHO FALLS, ID 83403-1629
PO BOX 1630, IDAHO FALLS, ID 83403-1630
PO BOX 1631, IDAHO FALLS, ID 83403-1631
PO BOX 1632, IDAHO FALLS, ID 83403-1632
PO BOX 1633, IDAHO FALLS, ID 83403-1633
PO BOX 1634, IDAHO FALLS, ID 83403-1634
PO BOX 1635, IDAHO FALLS, ID 83403-1635
PO BOX 1636, IDAHO FALLS, ID 83403-1636
PO BOX 1637, IDAHO FALLS, ID 83403-1637
PO BOX 1638, IDAHO FALLS, ID 83403-1638
PO BOX 1639, IDAHO FALLS, ID 83403-1639
PO BOX 1640, IDAHO FALLS, ID 83403-1640
PO BOX 1641, IDAHO FALLS, ID 83403-1641
PO BOX 1642, IDAHO FALLS, ID 83403-1642
PO BOX 1643, IDAHO FALLS, ID 83403-1643
PO BOX 1644, IDAHO FALLS, ID 83403-1644
PO BOX 1645, IDAHO FALLS, ID 83403-1645
PO BOX 1646, IDAHO FALLS, ID 83403-1646
PO BOX 1647, IDAHO FALLS, ID 83403-1647
PO BOX 1648, IDAHO FALLS, ID 83403-1648
PO BOX 1649, IDAHO FALLS, ID 83403-1649
PO BOX 1650, IDAHO FALLS, ID 83403-1650
PO BOX 1651, IDAHO FALLS, ID 83403-1651
PO BOX 1652, IDAHO FALLS, ID 83403-1652
PO BOX 1653, IDAHO FALLS, ID 83403-1653
PO BOX 1654, IDAHO FALLS, ID 83403-1654
PO BOX 1655, IDAHO FALLS, ID 83403-1655
PO BOX 1656, IDAHO FALLS, ID 83403-1656
PO BOX 1657, IDAHO FALLS, ID 83403-1657
PO BOX 1658, IDAHO FALLS, ID 83403-1658
PO BOX 1659, IDAHO FALLS, ID 83403-1659
PO BOX 1660, IDAHO FALLS, ID 83403-1660
PO BOX 1661, IDAHO FALLS, ID 83403-1661
PO BOX 1662, IDAHO FALLS, ID 83403-1662
PO BOX 1663, IDAHO FALLS, ID 83403-1663
PO BOX 1664, IDAHO FALLS, ID 83403-1664
PO BOX 1665, IDAHO FALLS, ID 83403-1665
PO BOX 1666, IDAHO FALLS, ID 83403-1666
PO BOX 1667, IDAHO FALLS, ID 83403-1667
PO BOX 1668, IDAHO FALLS, ID 83403-1668
PO BOX 1669, IDAHO FALLS, ID 83403-1669
PO BOX 1670, IDAHO FALLS, ID 83403-1670
PO BOX 1671, IDAHO FALLS, ID 83403-1671
PO BOX 1672, IDAHO FALLS, ID 83403-1672
PO BOX 1673, IDAHO FALLS, ID 83403-1673
PO BOX 1674, IDAHO FALLS, ID 83403-1674
PO BOX 1675, IDAHO FALLS, ID 83403-1675
PO BOX 1676, IDAHO FALLS, ID 83403-1676
PO BOX 1677, IDAHO FALLS, ID 83403-1677
PO BOX 1678, IDAHO FALLS, ID 83403-1678
PO BOX 1679, IDAHO FALLS, ID 83403-1679
PO BOX 1680, IDAHO FALLS, ID 83403-1680
PO BOX 1681, IDAHO FALLS, ID 83403-1681
PO BOX 1682, IDAHO FALLS, ID 83403-1682
PO BOX 1683, IDAHO FALLS, ID 83403-1683
PO BOX 1684, IDAHO FALLS, ID 83403-1684
PO BOX 1685, IDAHO FALLS, ID 83403-1685
PO BOX 1686, IDAHO FALLS, ID 83403-1686
PO BOX 1687, IDAHO FALLS, ID 83403-1687
PO BOX 1688, IDAHO FALLS, ID 83403-1688
PO BOX 1689, IDAHO FALLS, ID 83403-1689
PO BOX 1690, IDAHO FALLS, ID 83403-1690
PO BOX 1691, IDAHO FALLS, ID 83403-1691
PO BOX 1692, IDAHO FALLS, ID 83403-1692
PO BOX 1693, IDAHO FALLS, ID 83403-1693
PO BOX 1694, IDAHO FALLS, ID 83403-1694
PO BOX 1695, IDAHO FALLS, ID 83403-1695
PO BOX 1696, IDAHO FALLS, ID 83403-1696
PO BOX 1697, IDAHO FALLS, ID 83403-1697
PO BOX 1698, IDAHO FALLS, ID 83403-1698
PO BOX 1699, IDAHO FALLS, ID 83403-1699
PO BOX 1700, IDAHO FALLS, ID 83403-1700
PO BOX 1701, IDAHO FALLS, ID 83403-1701
PO BOX 1702, IDAHO FALLS, ID 83403-1702
PO BOX 1703, IDAHO FALLS, ID 83403-1703
PO BOX 1704, IDAHO FALLS, ID 83403-1704
PO BOX 1705, IDAHO FALLS, ID 83403-1705
PO BOX 1706, IDAHO FALLS, ID 83403-1706
PO BOX 1707, IDAHO FALLS, ID 83403-1707
PO BOX 1708, IDAHO FALLS, ID 83403-1708
PO BOX 1709, IDAHO FALLS, ID 83403-1709
PO BOX 1710, IDAHO FALLS, ID 83403-1710
PO BOX 1711, IDAHO FALLS, ID 83403-1711
PO BOX 1712, IDAHO FALLS, ID 83403-1712
PO BOX 1713, IDAHO FALLS, ID 83403-1713
PO BOX 1714, IDAHO FALLS, ID 83403-1714
PO BOX 1715, IDAHO FALLS, ID 83403-1715
PO BOX 1716, IDAHO FALLS, ID 83403-1716
PO BOX 1717, IDAHO FALLS, ID 83403-1717
PO BOX 1718, IDAHO FALLS, ID 83403-1718
PO BOX 1719, IDAHO FALLS, ID 83403-1719
PO BOX 1720, IDAHO FALLS, ID 83403-1720
PO BOX 1721, IDAHO FALLS, ID 83403-1721
PO BOX 1722, IDAHO FALLS, ID 83403-1722
PO BOX 1723, IDAHO FALLS, ID 83403-1723
PO BOX 1724, IDAHO FALLS, ID 83403-1724
PO BOX 1725, IDAHO FALLS, ID 83403-1725
PO BOX 1726, IDAHO FALLS, ID 83403-1726
PO BOX 1727, IDAHO FALLS, ID 83403-1727
PO BOX 1728, IDAHO FALLS, ID 83403-1728
PO BOX 1729, IDAHO FALLS, ID 83403-1729
PO BOX 1730, IDAHO FALLS, ID 83403-1730
PO BOX 1731, IDAHO FALLS, ID 83403-1731
PO BOX 1732, IDAHO FALLS, ID 83403-1732
PO BOX 1733, IDAHO FALLS, ID 83403-1733
PO BOX 1734, IDAHO FALLS, ID 83403-1734
PO BOX 1735, IDAHO FALLS, ID 83403-1735
PO BOX 1736, IDAHO FALLS, ID 83403-1736
PO BOX 1737, IDAHO FALLS, ID 83403-1737
PO BOX 1738, IDAHO FALLS, ID 83403-1738
PO BOX 1739, IDAHO FALLS, ID 83403-1739
PO BOX 1740, IDAHO FALLS, ID 83403-1740
PO BOX 1741, IDAHO FALLS, ID 83403-1741
PO BOX 1742, IDAHO FALLS, ID 83403-1742
PO BOX 1743, IDAHO FALLS, ID 83403-1743
PO BOX 1744, IDAHO FALLS, ID 83403-1744
PO BOX 1745, IDAHO FALLS, ID 83403-1745
PO BOX 1746, IDAHO FALLS, ID 83403-1746
PO BOX 1747, IDAHO FALLS, ID 83403-1747
PO BOX 1748, IDAHO FALLS, ID 83403-1748
PO BOX 1749, IDAHO FALLS, ID 83403-1749
PO BOX 1750, IDAHO FALLS, ID 83403-1750
PO BOX 1751, IDAHO FALLS, ID 83403-1751
PO BOX 1752, IDAHO FALLS, ID 83403-1752
PO BOX 1753, IDAHO FALLS, ID 83403-1753
PO BOX 1754, IDAHO FALLS, ID 83403-1754
PO BOX 1755, IDAHO FALLS, ID 83403-1755
PO BOX 1756, IDAHO FALLS, ID 83403-1756
PO BOX 1757, IDAHO FALLS, ID 83403-1757
PO BOX 1758, IDAHO FALLS, ID 83403-1758
PO BOX 1759, IDAHO FALLS, ID 83403-1759
PO BOX 1760, IDAHO FALLS, ID 83403-1760
PO BOX 1761, IDAHO FALLS, ID 83403-1761
PO BOX 1762, IDAHO FALLS, ID 83403-1762
PO BOX 1763, IDAHO FALLS, ID 83403-1763
PO BOX 1764, IDAHO FALLS, ID 83403-1764
PO BOX 1765, IDAHO FALLS, ID 83403-1765
PO BOX 1766, IDAHO FALLS, ID 83403-1766
PO BOX 1767, IDAHO FALLS, ID 83403-1767
PO BOX 1768, IDAHO FALLS, ID 83403-1768
PO BOX 1769, IDAHO FALLS, ID 83403-1769
PO BOX 1770, IDAHO FALLS, ID 83403-1770
PO BOX 1771, IDAHO FALLS, ID 83403-1771
PO BOX 1772, IDAHO FALLS, ID 83403-1772
PO BOX 1773, IDAHO FALLS, ID 83403-1773
PO BOX 1774, IDAHO FALLS, ID 83403-1774
PO BOX 1775, IDAHO FALLS, ID 83403-1775
PO BOX 1776, IDAHO FALLS, ID 83403-1776
PO BOX 1777, IDAHO FALLS, ID 83403-1777
PO BOX 1778, IDAHO FALLS, ID 83403-1778
PO BOX 1779, IDAHO FALLS, ID 83403-1779
PO BOX 1780, IDAHO FALLS, ID 83403-1780
PO BOX 1781, IDAHO FALLS, ID 83403-1781
PO BOX 1782, IDAHO FALLS, ID 83403-1782
PO BOX 1783, IDAHO FALLS, ID 83403-1783
PO BOX 1784, IDAHO FALLS, ID 83403-1784
PO BOX 1785, IDAHO FALLS, ID 83403-1785
PO BOX 1786, IDAHO FALLS, ID 83403-1786
PO BOX 1787, IDAHO FALLS, ID 83403-1787
PO BOX 1788, IDAHO FALLS, ID 83403-1788
PO BOX 1789, IDAHO FALLS, ID 83403-1789
PO BOX 1790, IDAHO FALLS, ID 83403-1790
PO BOX 1791, IDAHO FALLS, ID 83403-1791
PO BOX 1792, IDAHO FALLS, ID 83403-1792
PO BOX 1793, IDAHO FALLS, ID 83403-1793
PO BOX 1794, IDAHO FALLS, ID 83403-1794
PO BOX 1795, IDAHO FALLS, ID 83403-1795
PO BOX 1796, IDAHO FALLS, ID 83403-1796
PO BOX 1797, IDAHO FALLS, ID 83403-1797
PO BOX 1798, IDAHO FALLS, ID 83403-1798
PO BOX 1799, IDAHO FALLS, ID 83403-1799
PO BOX 1800, IDAHO FALLS, ID 83403-1800
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