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 51681, IDAHO FALLS, ID 83405-1681
PO BOX 51682, IDAHO FALLS, ID 83405-1682
PO BOX 51683, IDAHO FALLS, ID 83405-1683
PO BOX 51684, IDAHO FALLS, ID 83405-1684
PO BOX 51685, IDAHO FALLS, ID 83405-1685
PO BOX 51686, IDAHO FALLS, ID 83405-1686
PO BOX 51687, IDAHO FALLS, ID 83405-1687
PO BOX 51688, IDAHO FALLS, ID 83405-1688
PO BOX 51689, IDAHO FALLS, ID 83405-1689
PO BOX 51690, IDAHO FALLS, ID 83405-1690
PO BOX 51691, IDAHO FALLS, ID 83405-1691
PO BOX 51692, IDAHO FALLS, ID 83405-1692
PO BOX 51693, IDAHO FALLS, ID 83405-1693
PO BOX 51694, IDAHO FALLS, ID 83405-1694
PO BOX 51695, IDAHO FALLS, ID 83405-1695
PO BOX 51696, IDAHO FALLS, ID 83405-1696
PO BOX 51697, IDAHO FALLS, ID 83405-1697
PO BOX 51698, IDAHO FALLS, ID 83405-1698
PO BOX 51699, IDAHO FALLS, ID 83405-1699
PO BOX 51700, IDAHO FALLS, ID 83405-1700
PO BOX 51701, IDAHO FALLS, ID 83405-1701
PO BOX 51702, IDAHO FALLS, ID 83405-1702
PO BOX 51703, IDAHO FALLS, ID 83405-1703
PO BOX 51704, IDAHO FALLS, ID 83405-1704
PO BOX 51705, IDAHO FALLS, ID 83405-1705
PO BOX 51706, IDAHO FALLS, ID 83405-1706
PO BOX 51707, IDAHO FALLS, ID 83405-1707
PO BOX 51708, IDAHO FALLS, ID 83405-1708
PO BOX 51709, IDAHO FALLS, ID 83405-1709
PO BOX 51710, IDAHO FALLS, ID 83405-1710
PO BOX 51711, IDAHO FALLS, ID 83405-1711
PO BOX 51712, IDAHO FALLS, ID 83405-1712
PO BOX 51713, IDAHO FALLS, ID 83405-1713
PO BOX 51714, IDAHO FALLS, ID 83405-1714
PO BOX 51715, IDAHO FALLS, ID 83405-1715
PO BOX 51716, IDAHO FALLS, ID 83405-1716
PO BOX 51717, IDAHO FALLS, ID 83405-1717
PO BOX 51718, IDAHO FALLS, ID 83405-1718
PO BOX 51719, IDAHO FALLS, ID 83405-1719
PO BOX 51720, IDAHO FALLS, ID 83405-1720
PO BOX 51721, IDAHO FALLS, ID 83405-1721
PO BOX 51722, IDAHO FALLS, ID 83405-1722
PO BOX 51723, IDAHO FALLS, ID 83405-1723
PO BOX 51724, IDAHO FALLS, ID 83405-1724
PO BOX 51725, IDAHO FALLS, ID 83405-1725
PO BOX 51726, IDAHO FALLS, ID 83405-1726
PO BOX 51727, IDAHO FALLS, ID 83405-1727
PO BOX 51728, IDAHO FALLS, ID 83405-1728
PO BOX 51729, IDAHO FALLS, ID 83405-1729
PO BOX 51730, IDAHO FALLS, ID 83405-1730
PO BOX 51731, IDAHO FALLS, ID 83405-1731
PO BOX 51732, IDAHO FALLS, ID 83405-1732
PO BOX 51733, IDAHO FALLS, ID 83405-1733
PO BOX 51734, IDAHO FALLS, ID 83405-1734
PO BOX 51735, IDAHO FALLS, ID 83405-1735
PO BOX 51736, IDAHO FALLS, ID 83405-1736
PO BOX 51737, IDAHO FALLS, ID 83405-1737
PO BOX 51738, IDAHO FALLS, ID 83405-1738
PO BOX 51739, IDAHO FALLS, ID 83405-1739
PO BOX 51740, IDAHO FALLS, ID 83405-1740
PO BOX 51741, IDAHO FALLS, ID 83405-1741
PO BOX 51742, IDAHO FALLS, ID 83405-1742
PO BOX 51743, IDAHO FALLS, ID 83405-1743
PO BOX 51744, IDAHO FALLS, ID 83405-1744
PO BOX 51745, IDAHO FALLS, ID 83405-1745
PO BOX 51746, IDAHO FALLS, ID 83405-1746
PO BOX 51747, IDAHO FALLS, ID 83405-1747
PO BOX 51748, IDAHO FALLS, ID 83405-1748
PO BOX 51749, IDAHO FALLS, ID 83405-1749
PO BOX 51750, IDAHO FALLS, ID 83405-1750
PO BOX 51751, IDAHO FALLS, ID 83405-1751
PO BOX 51752, IDAHO FALLS, ID 83405-1752
PO BOX 51753, IDAHO FALLS, ID 83405-1753
PO BOX 51754, IDAHO FALLS, ID 83405-1754
PO BOX 51755, IDAHO FALLS, ID 83405-1755
PO BOX 51756, IDAHO FALLS, ID 83405-1756
PO BOX 51757, IDAHO FALLS, ID 83405-1757
PO BOX 51758, IDAHO FALLS, ID 83405-1758
PO BOX 51759, IDAHO FALLS, ID 83405-1759
PO BOX 51760, IDAHO FALLS, ID 83405-1760
PO BOX 51761, IDAHO FALLS, ID 83405-1761
PO BOX 51762, IDAHO FALLS, ID 83405-1762
PO BOX 51763, IDAHO FALLS, ID 83405-1763
PO BOX 51764, IDAHO FALLS, ID 83405-1764
PO BOX 51765, IDAHO FALLS, ID 83405-1765
PO BOX 51766, IDAHO FALLS, ID 83405-1766
PO BOX 51767, IDAHO FALLS, ID 83405-1767
PO BOX 51768, IDAHO FALLS, ID 83405-1768
PO BOX 51769, IDAHO FALLS, ID 83405-1769
PO BOX 51770, IDAHO FALLS, ID 83405-1770
PO BOX 51771, IDAHO FALLS, ID 83405-1771
PO BOX 51772, IDAHO FALLS, ID 83405-1772
PO BOX 51773, IDAHO FALLS, ID 83405-1773
PO BOX 51774, IDAHO FALLS, ID 83405-1774
PO BOX 51775, IDAHO FALLS, ID 83405-1775
PO BOX 51776, IDAHO FALLS, ID 83405-1776
PO BOX 51777, IDAHO FALLS, ID 83405-1777
PO BOX 51778, IDAHO FALLS, ID 83405-1778
PO BOX 51779, IDAHO FALLS, ID 83405-1779
PO BOX 51780, IDAHO FALLS, ID 83405-1780
PO BOX 51781, IDAHO FALLS, ID 83405-1781
PO BOX 51782, IDAHO FALLS, ID 83405-1782
PO BOX 51783, IDAHO FALLS, ID 83405-1783
PO BOX 51784, IDAHO FALLS, ID 83405-1784
PO BOX 51785, IDAHO FALLS, ID 83405-1785
PO BOX 51786, IDAHO FALLS, ID 83405-1786
PO BOX 51787, IDAHO FALLS, ID 83405-1787
PO BOX 51788, IDAHO FALLS, ID 83405-1788
PO BOX 51789, IDAHO FALLS, ID 83405-1789
PO BOX 51790, IDAHO FALLS, ID 83405-1790
PO BOX 51791, IDAHO FALLS, ID 83405-1791
PO BOX 51792, IDAHO FALLS, ID 83405-1792
PO BOX 51793, IDAHO FALLS, ID 83405-1793
PO BOX 51794, IDAHO FALLS, ID 83405-1794
PO BOX 51795, IDAHO FALLS, ID 83405-1795
PO BOX 51796, IDAHO FALLS, ID 83405-1796
PO BOX 51797, IDAHO FALLS, ID 83405-1797
PO BOX 51798, IDAHO FALLS, ID 83405-1798
PO BOX 51799, IDAHO FALLS, ID 83405-1799
PO BOX 51800, IDAHO FALLS, ID 83405-1800
PO BOX 51801, IDAHO FALLS, ID 83405-1801
PO BOX 51802, IDAHO FALLS, ID 83405-1802
PO BOX 51803, IDAHO FALLS, ID 83405-1803
PO BOX 51804, IDAHO FALLS, ID 83405-1804
PO BOX 51805, IDAHO FALLS, ID 83405-1805
PO BOX 51806, IDAHO FALLS, ID 83405-1806
PO BOX 51807, IDAHO FALLS, ID 83405-1807
PO BOX 51808, IDAHO FALLS, ID 83405-1808
PO BOX 51809, IDAHO FALLS, ID 83405-1809
PO BOX 51810, IDAHO FALLS, ID 83405-1810
PO BOX 51811, IDAHO FALLS, ID 83405-1811
PO BOX 51812, IDAHO FALLS, ID 83405-1812
PO BOX 51813, IDAHO FALLS, ID 83405-1813
PO BOX 51814, IDAHO FALLS, ID 83405-1814
PO BOX 51815, IDAHO FALLS, ID 83405-1815
PO BOX 51816, IDAHO FALLS, ID 83405-1816
PO BOX 51817, IDAHO FALLS, ID 83405-1817
PO BOX 51818, IDAHO FALLS, ID 83405-1818
PO BOX 51819, IDAHO FALLS, ID 83405-1819
PO BOX 51820, IDAHO FALLS, ID 83405-1820
PO BOX 51821, IDAHO FALLS, ID 83405-1821
PO BOX 51822, IDAHO FALLS, ID 83405-1822
PO BOX 51823, IDAHO FALLS, ID 83405-1823
PO BOX 51824, IDAHO FALLS, ID 83405-1824
PO BOX 51825, IDAHO FALLS, ID 83405-1825
PO BOX 51826, IDAHO FALLS, ID 83405-1826
PO BOX 51827, IDAHO FALLS, ID 83405-1827
PO BOX 51828, IDAHO FALLS, ID 83405-1828
PO BOX 51829, IDAHO FALLS, ID 83405-1829
PO BOX 51830, IDAHO FALLS, ID 83405-1830
PO BOX 51831, IDAHO FALLS, ID 83405-1831
PO BOX 51832, IDAHO FALLS, ID 83405-1832
PO BOX 51833, IDAHO FALLS, ID 83405-1833
PO BOX 51834, IDAHO FALLS, ID 83405-1834
PO BOX 51835, IDAHO FALLS, ID 83405-1835
PO BOX 51836, IDAHO FALLS, ID 83405-1836
PO BOX 51837, IDAHO FALLS, ID 83405-1837
PO BOX 51838, IDAHO FALLS, ID 83405-1838
PO BOX 51839, IDAHO FALLS, ID 83405-1839
PO BOX 51840, IDAHO FALLS, ID 83405-1840
PO BOX 51841, IDAHO FALLS, ID 83405-1841
PO BOX 51842, IDAHO FALLS, ID 83405-1842
PO BOX 51843, IDAHO FALLS, ID 83405-1843
PO BOX 51844, IDAHO FALLS, ID 83405-1844
PO BOX 51845, IDAHO FALLS, ID 83405-1845
PO BOX 51846, IDAHO FALLS, ID 83405-1846
PO BOX 51847, IDAHO FALLS, ID 83405-1847
PO BOX 51848, IDAHO FALLS, ID 83405-1848
PO BOX 51849, IDAHO FALLS, ID 83405-1849
PO BOX 51850, IDAHO FALLS, ID 83405-1850
PO BOX 51851, IDAHO FALLS, ID 83405-1851
PO BOX 51852, IDAHO FALLS, ID 83405-1852
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