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 221701, LOUISVILLE, KY 40252-1701
PO BOX 221702, LOUISVILLE, KY 40252-1702
PO BOX 221703, LOUISVILLE, KY 40252-1703
PO BOX 221704, LOUISVILLE, KY 40252-1704
PO BOX 221705, LOUISVILLE, KY 40252-1705
PO BOX 221706, LOUISVILLE, KY 40252-1706
PO BOX 221707, LOUISVILLE, KY 40252-1707
PO BOX 221708, LOUISVILLE, KY 40252-1708
PO BOX 221709, LOUISVILLE, KY 40252-1709
PO BOX 221710, LOUISVILLE, KY 40252-1710
PO BOX 221711, LOUISVILLE, KY 40252-1711
PO BOX 221712, LOUISVILLE, KY 40252-1712
PO BOX 221713, LOUISVILLE, KY 40252-1713
PO BOX 221714, LOUISVILLE, KY 40252-1714
PO BOX 221715, LOUISVILLE, KY 40252-1715
PO BOX 221716, LOUISVILLE, KY 40252-1716
PO BOX 221717, LOUISVILLE, KY 40252-1717
PO BOX 221718, LOUISVILLE, KY 40252-1718
PO BOX 221719, LOUISVILLE, KY 40252-1719
PO BOX 221720, LOUISVILLE, KY 40252-1720
PO BOX 221721, LOUISVILLE, KY 40252-1721
PO BOX 221722, LOUISVILLE, KY 40252-1722
PO BOX 221723, LOUISVILLE, KY 40252-1723
PO BOX 221724, LOUISVILLE, KY 40252-1724
PO BOX 221725, LOUISVILLE, KY 40252-1725
PO BOX 221726, LOUISVILLE, KY 40252-1726
PO BOX 221727, LOUISVILLE, KY 40252-1727
PO BOX 221728, LOUISVILLE, KY 40252-1728
PO BOX 221729, LOUISVILLE, KY 40252-1729
PO BOX 221730, LOUISVILLE, KY 40252-1730
PO BOX 221731, LOUISVILLE, KY 40252-1731
PO BOX 221732, LOUISVILLE, KY 40252-1732
PO BOX 221733, LOUISVILLE, KY 40252-1733
PO BOX 221734, LOUISVILLE, KY 40252-1734
PO BOX 221735, LOUISVILLE, KY 40252-1735
PO BOX 221736, LOUISVILLE, KY 40252-1736
PO BOX 221737, LOUISVILLE, KY 40252-1737
PO BOX 221738, LOUISVILLE, KY 40252-1738
PO BOX 221739, LOUISVILLE, KY 40252-1739
PO BOX 221740, LOUISVILLE, KY 40252-1740
PO BOX 221741, LOUISVILLE, KY 40252-1741
PO BOX 221742, LOUISVILLE, KY 40252-1742
PO BOX 221743, LOUISVILLE, KY 40252-1743
PO BOX 221744, LOUISVILLE, KY 40252-1744
PO BOX 221745, LOUISVILLE, KY 40252-1745
PO BOX 221746, LOUISVILLE, KY 40252-1746
PO BOX 221747, LOUISVILLE, KY 40252-1747
PO BOX 221748, LOUISVILLE, KY 40252-1748
PO BOX 221749, LOUISVILLE, KY 40252-1749
PO BOX 221750, LOUISVILLE, KY 40252-1750
PO BOX 221751, LOUISVILLE, KY 40252-1751
PO BOX 221752, LOUISVILLE, KY 40252-1752
PO BOX 221753, LOUISVILLE, KY 40252-1753
PO BOX 221754, LOUISVILLE, KY 40252-1754
PO BOX 221755, LOUISVILLE, KY 40252-1755
PO BOX 221756, LOUISVILLE, KY 40252-1756
PO BOX 221757, LOUISVILLE, KY 40252-1757
PO BOX 221758, LOUISVILLE, KY 40252-1758
PO BOX 221759, LOUISVILLE, KY 40252-1759
PO BOX 221760, LOUISVILLE, KY 40252-1760
PO BOX 221761, LOUISVILLE, KY 40252-1761
PO BOX 221762, LOUISVILLE, KY 40252-1762
PO BOX 221763, LOUISVILLE, KY 40252-1763
PO BOX 221764, LOUISVILLE, KY 40252-1764
PO BOX 221765, LOUISVILLE, KY 40252-1765
PO BOX 221766, LOUISVILLE, KY 40252-1766
PO BOX 221767, LOUISVILLE, KY 40252-1767
PO BOX 221768, LOUISVILLE, KY 40252-1768
PO BOX 221769, LOUISVILLE, KY 40252-1769
PO BOX 221770, LOUISVILLE, KY 40252-1770
PO BOX 221771, LOUISVILLE, KY 40252-1771
PO BOX 221772, LOUISVILLE, KY 40252-1772
PO BOX 221773, LOUISVILLE, KY 40252-1773
PO BOX 221774, LOUISVILLE, KY 40252-1774
PO BOX 221775, LOUISVILLE, KY 40252-1775
PO BOX 221776, LOUISVILLE, KY 40252-1776
PO BOX 221777, LOUISVILLE, KY 40252-1777
PO BOX 221778, LOUISVILLE, KY 40252-1778
PO BOX 221779, LOUISVILLE, KY 40252-1779
PO BOX 221780, LOUISVILLE, KY 40252-1780
PO BOX 221781, LOUISVILLE, KY 40252-1781
PO BOX 221782, LOUISVILLE, KY 40252-1782
PO BOX 221783, LOUISVILLE, KY 40252-1783
PO BOX 221784, LOUISVILLE, KY 40252-1784
PO BOX 221785, LOUISVILLE, KY 40252-1785
PO BOX 221786, LOUISVILLE, KY 40252-1786
PO BOX 221787, LOUISVILLE, KY 40252-1787
PO BOX 221788, LOUISVILLE, KY 40252-1788
PO BOX 221789, LOUISVILLE, KY 40252-1789
PO BOX 221790, LOUISVILLE, KY 40252-1790
PO BOX 221791, LOUISVILLE, KY 40252-1791
PO BOX 221792, LOUISVILLE, KY 40252-1792
PO BOX 221793, LOUISVILLE, KY 40252-1793
PO BOX 221794, LOUISVILLE, KY 40252-1794
PO BOX 221795, LOUISVILLE, KY 40252-1795
PO BOX 221796, LOUISVILLE, KY 40252-1796
PO BOX 221797, LOUISVILLE, KY 40252-1797
PO BOX 221798, LOUISVILLE, KY 40252-1798
PO BOX 221799, LOUISVILLE, KY 40252-1799
PO BOX 221800, LOUISVILLE, KY 40252-1800
PO BOX 221801, LOUISVILLE, KY 40252-1801
PO BOX 221802, LOUISVILLE, KY 40252-1802
PO BOX 221803, LOUISVILLE, KY 40252-1803
PO BOX 221804, LOUISVILLE, KY 40252-1804
PO BOX 221805, LOUISVILLE, KY 40252-1805
PO BOX 221806, LOUISVILLE, KY 40252-1806
PO BOX 221807, LOUISVILLE, KY 40252-1807
PO BOX 221808, LOUISVILLE, KY 40252-1808
PO BOX 221809, LOUISVILLE, KY 40252-1809
PO BOX 221810, LOUISVILLE, KY 40252-1810
PO BOX 221811, LOUISVILLE, KY 40252-1811
PO BOX 221812, LOUISVILLE, KY 40252-1812
PO BOX 221813, LOUISVILLE, KY 40252-1813
PO BOX 221814, LOUISVILLE, KY 40252-1814
PO BOX 221815, LOUISVILLE, KY 40252-1815
PO BOX 221816, LOUISVILLE, KY 40252-1816
PO BOX 221817, LOUISVILLE, KY 40252-1817
PO BOX 221818, LOUISVILLE, KY 40252-1818
PO BOX 221819, LOUISVILLE, KY 40252-1819
PO BOX 221820, LOUISVILLE, KY 40252-1820
PO BOX 221821, LOUISVILLE, KY 40252-1821
PO BOX 221822, LOUISVILLE, KY 40252-1822
PO BOX 221823, LOUISVILLE, KY 40252-1823
PO BOX 221824, LOUISVILLE, KY 40252-1824
PO BOX 221825, LOUISVILLE, KY 40252-1825
PO BOX 221826, LOUISVILLE, KY 40252-1826
PO BOX 221827, LOUISVILLE, KY 40252-1827
PO BOX 221828, LOUISVILLE, KY 40252-1828
PO BOX 221829, LOUISVILLE, KY 40252-1829
PO BOX 221830, LOUISVILLE, KY 40252-1830
PO BOX 221831, LOUISVILLE, KY 40252-1831
PO BOX 221832, LOUISVILLE, KY 40252-1832
PO BOX 221833, LOUISVILLE, KY 40252-1833
PO BOX 221834, LOUISVILLE, KY 40252-1834
PO BOX 221835, LOUISVILLE, KY 40252-1835
PO BOX 221836, LOUISVILLE, KY 40252-1836
PO BOX 221837, LOUISVILLE, KY 40252-1837
PO BOX 221838, LOUISVILLE, KY 40252-1838
PO BOX 221839, LOUISVILLE, KY 40252-1839
PO BOX 221840, LOUISVILLE, KY 40252-1840
PO BOX 221841, LOUISVILLE, KY 40252-1841
PO BOX 221842, LOUISVILLE, KY 40252-1842
PO BOX 221843, LOUISVILLE, KY 40252-1843
PO BOX 221844, LOUISVILLE, KY 40252-1844
PO BOX 221845, LOUISVILLE, KY 40252-1845
PO BOX 221846, LOUISVILLE, KY 40252-1846
PO BOX 221847, LOUISVILLE, KY 40252-1847
PO BOX 221848, LOUISVILLE, KY 40252-1848
PO BOX 221849, LOUISVILLE, KY 40252-1849
PO BOX 221850, LOUISVILLE, KY 40252-1850
PO BOX 221851, LOUISVILLE, KY 40252-1851
PO BOX 221852, LOUISVILLE, KY 40252-1852
PO BOX 221853, LOUISVILLE, KY 40252-1853
PO BOX 221854, LOUISVILLE, KY 40252-1854
PO BOX 221855, LOUISVILLE, KY 40252-1855
PO BOX 221856, LOUISVILLE, KY 40252-1856
PO BOX 221857, LOUISVILLE, KY 40252-1857
PO BOX 221858, LOUISVILLE, KY 40252-1858
PO BOX 221859, LOUISVILLE, KY 40252-1859
PO BOX 221860, LOUISVILLE, KY 40252-1860
PO BOX 221861, LOUISVILLE, KY 40252-1861
PO BOX 221862, LOUISVILLE, KY 40252-1862
PO BOX 221863, LOUISVILLE, KY 40252-1863
PO BOX 221864, LOUISVILLE, KY 40252-1864
PO BOX 221865, LOUISVILLE, KY 40252-1865
PO BOX 221866, LOUISVILLE, KY 40252-1866
PO BOX 221867, LOUISVILLE, KY 40252-1867
PO BOX 221868, LOUISVILLE, KY 40252-1868
PO BOX 221869, LOUISVILLE, KY 40252-1869
PO BOX 221870, LOUISVILLE, KY 40252-1870
PO BOX 221871, LOUISVILLE, KY 40252-1871
PO BOX 221872, LOUISVILLE, KY 40252-1872
PO BOX 221873, LOUISVILLE, KY 40252-1873
PO BOX 221874, LOUISVILLE, KY 40252-1874
PO BOX 221875, LOUISVILLE, KY 40252-1875
PO BOX 221876, LOUISVILLE, KY 40252-1876
PO BOX 221877, LOUISVILLE, KY 40252-1877
PO BOX 221878, LOUISVILLE, KY 40252-1878
PO BOX 221879, LOUISVILLE, KY 40252-1879
PO BOX 221880, LOUISVILLE, KY 40252-1880
PO BOX 221881, LOUISVILLE, KY 40252-1881
PO BOX 221882, LOUISVILLE, KY 40252-1882
PO BOX 221883, LOUISVILLE, KY 40252-1883
PO BOX 221884, LOUISVILLE, KY 40252-1884
PO BOX 221885, LOUISVILLE, KY 40252-1885
PO BOX 221886, LOUISVILLE, KY 40252-1886
PO BOX 221887, LOUISVILLE, KY 40252-1887
PO BOX 221888, LOUISVILLE, KY 40252-1888
PO BOX 221889, LOUISVILLE, KY 40252-1889
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