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 27681, SAN DIEGO, CA 92198-1681
PO BOX 27682, SAN DIEGO, CA 92198-1682
PO BOX 27683, SAN DIEGO, CA 92198-1683
PO BOX 27684, SAN DIEGO, CA 92198-1684
PO BOX 27685, SAN DIEGO, CA 92198-1685
PO BOX 27686, SAN DIEGO, CA 92198-1686
PO BOX 27687, SAN DIEGO, CA 92198-1687
PO BOX 27688, SAN DIEGO, CA 92198-1688
PO BOX 27689, SAN DIEGO, CA 92198-1689
PO BOX 27690, SAN DIEGO, CA 92198-1690
PO BOX 27691, SAN DIEGO, CA 92198-1691
PO BOX 27692, SAN DIEGO, CA 92198-1692
PO BOX 27693, SAN DIEGO, CA 92198-1693
PO BOX 27694, SAN DIEGO, CA 92198-1694
PO BOX 27695, SAN DIEGO, CA 92198-1695
PO BOX 27696, SAN DIEGO, CA 92198-1696
PO BOX 27697, SAN DIEGO, CA 92198-1697
PO BOX 27698, SAN DIEGO, CA 92198-1698
PO BOX 27699, SAN DIEGO, CA 92198-1699
PO BOX 27700, SAN DIEGO, CA 92198-1700
PO BOX 27701, SAN DIEGO, CA 92198-1701
PO BOX 27702, SAN DIEGO, CA 92198-1702
PO BOX 27703, SAN DIEGO, CA 92198-1703
PO BOX 27704, SAN DIEGO, CA 92198-1704
PO BOX 27705, SAN DIEGO, CA 92198-1705
PO BOX 27706, SAN DIEGO, CA 92198-1706
PO BOX 27707, SAN DIEGO, CA 92198-1707
PO BOX 27708, SAN DIEGO, CA 92198-1708
PO BOX 27709, SAN DIEGO, CA 92198-1709
PO BOX 27710, SAN DIEGO, CA 92198-1710
PO BOX 27711, SAN DIEGO, CA 92198-1711
PO BOX 27712, SAN DIEGO, CA 92198-1712
PO BOX 27713, SAN DIEGO, CA 92198-1713
PO BOX 27714, SAN DIEGO, CA 92198-1714
PO BOX 27715, SAN DIEGO, CA 92198-1715
PO BOX 27716, SAN DIEGO, CA 92198-1716
PO BOX 27717, SAN DIEGO, CA 92198-1717
PO BOX 27718, SAN DIEGO, CA 92198-1718
PO BOX 27719, SAN DIEGO, CA 92198-1719
PO BOX 27720, SAN DIEGO, CA 92198-1720
PO BOX 27721, SAN DIEGO, CA 92198-1721
PO BOX 27722, SAN DIEGO, CA 92198-1722
PO BOX 27723, SAN DIEGO, CA 92198-1723
PO BOX 27724, SAN DIEGO, CA 92198-1724
PO BOX 27725, SAN DIEGO, CA 92198-1725
PO BOX 27726, SAN DIEGO, CA 92198-1726
PO BOX 27727, SAN DIEGO, CA 92198-1727
PO BOX 27728, SAN DIEGO, CA 92198-1728
PO BOX 27729, SAN DIEGO, CA 92198-1729
PO BOX 27730, SAN DIEGO, CA 92198-1730
PO BOX 27731, SAN DIEGO, CA 92198-1731
PO BOX 27732, SAN DIEGO, CA 92198-1732
PO BOX 27733, SAN DIEGO, CA 92198-1733
PO BOX 27734, SAN DIEGO, CA 92198-1734
PO BOX 27735, SAN DIEGO, CA 92198-1735
PO BOX 27736, SAN DIEGO, CA 92198-1736
PO BOX 27737, SAN DIEGO, CA 92198-1737
PO BOX 27738, SAN DIEGO, CA 92198-1738
PO BOX 27739, SAN DIEGO, CA 92198-1739
PO BOX 27740, SAN DIEGO, CA 92198-1740
PO BOX 27741, SAN DIEGO, CA 92198-1741
PO BOX 27742, SAN DIEGO, CA 92198-1742
PO BOX 27743, SAN DIEGO, CA 92198-1743
PO BOX 27744, SAN DIEGO, CA 92198-1744
PO BOX 27745, SAN DIEGO, CA 92198-1745
PO BOX 27746, SAN DIEGO, CA 92198-1746
PO BOX 27747, SAN DIEGO, CA 92198-1747
PO BOX 27748, SAN DIEGO, CA 92198-1748
PO BOX 27749, SAN DIEGO, CA 92198-1749
PO BOX 27750, SAN DIEGO, CA 92198-1750
PO BOX 27751, SAN DIEGO, CA 92198-1751
PO BOX 27752, SAN DIEGO, CA 92198-1752
PO BOX 27753, SAN DIEGO, CA 92198-1753
PO BOX 27754, SAN DIEGO, CA 92198-1754
PO BOX 27755, SAN DIEGO, CA 92198-1755
PO BOX 27756, SAN DIEGO, CA 92198-1756
PO BOX 27757, SAN DIEGO, CA 92198-1757
PO BOX 27758, SAN DIEGO, CA 92198-1758
PO BOX 27759, SAN DIEGO, CA 92198-1759
PO BOX 27760, SAN DIEGO, CA 92198-1760
PO BOX 27761, SAN DIEGO, CA 92198-1761
PO BOX 27762, SAN DIEGO, CA 92198-1762
PO BOX 27763, SAN DIEGO, CA 92198-1763
PO BOX 27764, SAN DIEGO, CA 92198-1764
PO BOX 27765, SAN DIEGO, CA 92198-1765
PO BOX 27766, SAN DIEGO, CA 92198-1766
PO BOX 27767, SAN DIEGO, CA 92198-1767
PO BOX 27768, SAN DIEGO, CA 92198-1768
PO BOX 27769, SAN DIEGO, CA 92198-1769
PO BOX 27770, SAN DIEGO, CA 92198-1770
PO BOX 27771, SAN DIEGO, CA 92198-1771
PO BOX 27772, SAN DIEGO, CA 92198-1772
PO BOX 27773, SAN DIEGO, CA 92198-1773
PO BOX 27774, SAN DIEGO, CA 92198-1774
PO BOX 27775, SAN DIEGO, CA 92198-1775
PO BOX 27776, SAN DIEGO, CA 92198-1776
PO BOX 27777, SAN DIEGO, CA 92198-1777
PO BOX 27778, SAN DIEGO, CA 92198-1778
PO BOX 27779, SAN DIEGO, CA 92198-1779
PO BOX 27780, SAN DIEGO, CA 92198-1780
PO BOX 27781, SAN DIEGO, CA 92198-1781
PO BOX 27782, SAN DIEGO, CA 92198-1782
PO BOX 27783, SAN DIEGO, CA 92198-1783
PO BOX 27784, SAN DIEGO, CA 92198-1784
PO BOX 27785, SAN DIEGO, CA 92198-1785
PO BOX 27786, SAN DIEGO, CA 92198-1786
PO BOX 27787, SAN DIEGO, CA 92198-1787
PO BOX 27788, SAN DIEGO, CA 92198-1788
PO BOX 27789, SAN DIEGO, CA 92198-1789
PO BOX 27790, SAN DIEGO, CA 92198-1790
PO BOX 27791, SAN DIEGO, CA 92198-1791
PO BOX 27792, SAN DIEGO, CA 92198-1792
PO BOX 27793, SAN DIEGO, CA 92198-1793
PO BOX 27794, SAN DIEGO, CA 92198-1794
PO BOX 27795, SAN DIEGO, CA 92198-1795
PO BOX 27796, SAN DIEGO, CA 92198-1796
PO BOX 27797, SAN DIEGO, CA 92198-1797
PO BOX 27798, SAN DIEGO, CA 92198-1798
PO BOX 27799, SAN DIEGO, CA 92198-1799
PO BOX 27800, SAN DIEGO, CA 92198-1800
PO BOX 27801, SAN DIEGO, CA 92198-1801
PO BOX 27802, SAN DIEGO, CA 92198-1802
PO BOX 27803, SAN DIEGO, CA 92198-1803
PO BOX 27804, SAN DIEGO, CA 92198-1804
PO BOX 27805, SAN DIEGO, CA 92198-1805
PO BOX 27806, SAN DIEGO, CA 92198-1806
PO BOX 27807, SAN DIEGO, CA 92198-1807
PO BOX 27808, SAN DIEGO, CA 92198-1808
PO BOX 27809, SAN DIEGO, CA 92198-1809
PO BOX 27810, SAN DIEGO, CA 92198-1810
PO BOX 27811, SAN DIEGO, CA 92198-1811
PO BOX 27812, SAN DIEGO, CA 92198-1812
PO BOX 27813, SAN DIEGO, CA 92198-1813
PO BOX 27814, SAN DIEGO, CA 92198-1814
PO BOX 27815, SAN DIEGO, CA 92198-1815
PO BOX 27816, SAN DIEGO, CA 92198-1816
PO BOX 27817, SAN DIEGO, CA 92198-1817
PO BOX 27818, SAN DIEGO, CA 92198-1818
PO BOX 27819, SAN DIEGO, CA 92198-1819
PO BOX 27820, SAN DIEGO, CA 92198-1820
PO BOX 27821, SAN DIEGO, CA 92198-1821
PO BOX 27822, SAN DIEGO, CA 92198-1822
PO BOX 27823, SAN DIEGO, CA 92198-1823
PO BOX 27824, SAN DIEGO, CA 92198-1824
PO BOX 27825, SAN DIEGO, CA 92198-1825
PO BOX 27826, SAN DIEGO, CA 92198-1826
PO BOX 27827, SAN DIEGO, CA 92198-1827
PO BOX 27828, SAN DIEGO, CA 92198-1828
PO BOX 27829, SAN DIEGO, CA 92198-1829
PO BOX 27830, SAN DIEGO, CA 92198-1830
PO BOX 27831, SAN DIEGO, CA 92198-1831
PO BOX 27832, SAN DIEGO, CA 92198-1832
PO BOX 27833, SAN DIEGO, CA 92198-1833
PO BOX 27834, SAN DIEGO, CA 92198-1834
PO BOX 27835, SAN DIEGO, CA 92198-1835
PO BOX 27836, SAN DIEGO, CA 92198-1836
PO BOX 27837, SAN DIEGO, CA 92198-1837
PO BOX 27838, SAN DIEGO, CA 92198-1838
PO BOX 27839, SAN DIEGO, CA 92198-1839
PO BOX 27840, SAN DIEGO, CA 92198-1840
PO BOX 27841, SAN DIEGO, CA 92198-1841
PO BOX 27842, SAN DIEGO, CA 92198-1842
PO BOX 27843, SAN DIEGO, CA 92198-1843
PO BOX 27844, SAN DIEGO, CA 92198-1844
PO BOX 27845, SAN DIEGO, CA 92198-1845
PO BOX 27846, SAN DIEGO, CA 92198-1846
PO BOX 27847, SAN DIEGO, CA 92198-1847
PO BOX 27848, SAN DIEGO, CA 92198-1848
PO BOX 27849, SAN DIEGO, CA 92198-1849
PO BOX 27850, SAN DIEGO, CA 92198-1850
PO BOX 27851, SAN DIEGO, CA 92198-1851
PO BOX 27852, SAN DIEGO, CA 92198-1852
PO BOX 27853, SAN DIEGO, CA 92198-1853
PO BOX 27854, SAN DIEGO, CA 92198-1854
PO BOX 27855, SAN DIEGO, CA 92198-1855
PO BOX 27856, SAN DIEGO, CA 92198-1856
PO BOX 27857, SAN DIEGO, CA 92198-1857
PO BOX 27858, SAN DIEGO, CA 92198-1858
PO BOX 27859, SAN DIEGO, CA 92198-1859
PO BOX 27860, SAN DIEGO, CA 92198-1860
PO BOX 27861, SAN DIEGO, CA 92198-1861
PO BOX 27862, SAN DIEGO, CA 92198-1862
PO BOX 27863, SAN DIEGO, CA 92198-1863
PO BOX 27864, SAN DIEGO, CA 92198-1864
PO BOX 27865, SAN DIEGO, CA 92198-1865
PO BOX 27866, SAN DIEGO, CA 92198-1866
PO BOX 27867, SAN DIEGO, CA 92198-1867
PO BOX 27868, SAN DIEGO, CA 92198-1868
PO BOX 27869, SAN DIEGO, CA 92198-1869
PO BOX 27870, SAN DIEGO, CA 92198-1870
PO BOX 27871, SAN DIEGO, CA 92198-1871
PO BOX 27872, SAN DIEGO, CA 92198-1872
PO BOX 27873, SAN DIEGO, CA 92198-1873
PO BOX 27874, SAN DIEGO, CA 92198-1874
PO BOX 27875, SAN DIEGO, CA 92198-1875
PO BOX 27876, SAN DIEGO, CA 92198-1876
PO BOX 27877, SAN DIEGO, CA 92198-1877
PO BOX 27878, SAN DIEGO, CA 92198-1878
PO BOX 27879, SAN DIEGO, CA 92198-1879
PO BOX 27880, SAN DIEGO, CA 92198-1880
PO BOX 27881, SAN DIEGO, CA 92198-1881
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