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 11731, SANTA BARBARA, CA 93107-1731
PO BOX 11732, SANTA BARBARA, CA 93107-1732
PO BOX 11733, SANTA BARBARA, CA 93107-1733
PO BOX 11734, SANTA BARBARA, CA 93107-1734
PO BOX 11735, SANTA BARBARA, CA 93107-1735
PO BOX 11736, SANTA BARBARA, CA 93107-1736
PO BOX 11737, SANTA BARBARA, CA 93107-1737
PO BOX 11738, SANTA BARBARA, CA 93107-1738
PO BOX 11739, SANTA BARBARA, CA 93107-1739
PO BOX 11740, SANTA BARBARA, CA 93107-1740
PO BOX 11741, SANTA BARBARA, CA 93107-1741
PO BOX 11742, SANTA BARBARA, CA 93107-1742
PO BOX 11743, SANTA BARBARA, CA 93107-1743
PO BOX 11744, SANTA BARBARA, CA 93107-1744
PO BOX 11745, SANTA BARBARA, CA 93107-1745
PO BOX 11746, SANTA BARBARA, CA 93107-1746
PO BOX 11747, SANTA BARBARA, CA 93107-1747
PO BOX 11748, SANTA BARBARA, CA 93107-1748
PO BOX 11749, SANTA BARBARA, CA 93107-1749
PO BOX 11750, SANTA BARBARA, CA 93107-1750
PO BOX 11751, SANTA BARBARA, CA 93107-1751
PO BOX 11752, SANTA BARBARA, CA 93107-1752
PO BOX 11753, SANTA BARBARA, CA 93107-1753
PO BOX 11754, SANTA BARBARA, CA 93107-1754
PO BOX 11755, SANTA BARBARA, CA 93107-1755
PO BOX 11756, SANTA BARBARA, CA 93107-1756
PO BOX 11757, SANTA BARBARA, CA 93107-1757
PO BOX 11758, SANTA BARBARA, CA 93107-1758
PO BOX 11759, SANTA BARBARA, CA 93107-1759
PO BOX 11760, SANTA BARBARA, CA 93107-1760
PO BOX 11761, SANTA BARBARA, CA 93107-1761
PO BOX 11762, SANTA BARBARA, CA 93107-1762
PO BOX 11763, SANTA BARBARA, CA 93107-1763
PO BOX 11764, SANTA BARBARA, CA 93107-1764
PO BOX 11765, SANTA BARBARA, CA 93107-1765
PO BOX 11766, SANTA BARBARA, CA 93107-1766
PO BOX 11767, SANTA BARBARA, CA 93107-1767
PO BOX 11768, SANTA BARBARA, CA 93107-1768
PO BOX 11769, SANTA BARBARA, CA 93107-1769
PO BOX 11770, SANTA BARBARA, CA 93107-1770
PO BOX 11771, SANTA BARBARA, CA 93107-1771
PO BOX 11772, SANTA BARBARA, CA 93107-1772
PO BOX 11773, SANTA BARBARA, CA 93107-1773
PO BOX 11774, SANTA BARBARA, CA 93107-1774
PO BOX 11775, SANTA BARBARA, CA 93107-1775
PO BOX 11776, SANTA BARBARA, CA 93107-1776
PO BOX 11777, SANTA BARBARA, CA 93107-1777
PO BOX 11778, SANTA BARBARA, CA 93107-1778
PO BOX 11779, SANTA BARBARA, CA 93107-1779
PO BOX 11780, SANTA BARBARA, CA 93107-1780
PO BOX 11781, SANTA BARBARA, CA 93107-1781
PO BOX 11782, SANTA BARBARA, CA 93107-1782
PO BOX 11783, SANTA BARBARA, CA 93107-1783
PO BOX 11784, SANTA BARBARA, CA 93107-1784
PO BOX 11785, SANTA BARBARA, CA 93107-1785
PO BOX 11786, SANTA BARBARA, CA 93107-1786
PO BOX 11787, SANTA BARBARA, CA 93107-1787
PO BOX 11788, SANTA BARBARA, CA 93107-1788
PO BOX 11789, SANTA BARBARA, CA 93107-1789
PO BOX 11790, SANTA BARBARA, CA 93107-1790
PO BOX 11791, SANTA BARBARA, CA 93107-1791
PO BOX 11792, SANTA BARBARA, CA 93107-1792
PO BOX 11793, SANTA BARBARA, CA 93107-1793
PO BOX 11794, SANTA BARBARA, CA 93107-1794
PO BOX 11795, SANTA BARBARA, CA 93107-1795
PO BOX 11796, SANTA BARBARA, CA 93107-1796
PO BOX 11797, SANTA BARBARA, CA 93107-1797
PO BOX 11798, SANTA BARBARA, CA 93107-1798
PO BOX 11799, SANTA BARBARA, CA 93107-1799
PO BOX 11800, SANTA BARBARA, CA 93107-1800
PO BOX 11801, SANTA BARBARA, CA 93107-1801
PO BOX 11802, SANTA BARBARA, CA 93107-1802
PO BOX 11803, SANTA BARBARA, CA 93107-1803
PO BOX 11804, SANTA BARBARA, CA 93107-1804
PO BOX 11805, SANTA BARBARA, CA 93107-1805
PO BOX 11806, SANTA BARBARA, CA 93107-1806
PO BOX 11807, SANTA BARBARA, CA 93107-1807
PO BOX 11808, SANTA BARBARA, CA 93107-1808
PO BOX 11809, SANTA BARBARA, CA 93107-1809
PO BOX 11810, SANTA BARBARA, CA 93107-1810
PO BOX 11811, SANTA BARBARA, CA 93107-1811
PO BOX 11812, SANTA BARBARA, CA 93107-1812
PO BOX 11813, SANTA BARBARA, CA 93107-1813
PO BOX 11814, SANTA BARBARA, CA 93107-1814
PO BOX 11815, SANTA BARBARA, CA 93107-1815
PO BOX 11816, SANTA BARBARA, CA 93107-1816
PO BOX 11817, SANTA BARBARA, CA 93107-1817
PO BOX 11818, SANTA BARBARA, CA 93107-1818
PO BOX 11819, SANTA BARBARA, CA 93107-1819
PO BOX 11820, SANTA BARBARA, CA 93107-1820
PO BOX 11821, SANTA BARBARA, CA 93107-1821
PO BOX 11822, SANTA BARBARA, CA 93107-1822
PO BOX 11823, SANTA BARBARA, CA 93107-1823
PO BOX 11824, SANTA BARBARA, CA 93107-1824
PO BOX 11825, SANTA BARBARA, CA 93107-1825
PO BOX 11826, SANTA BARBARA, CA 93107-1826
PO BOX 11827, SANTA BARBARA, CA 93107-1827
PO BOX 11828, SANTA BARBARA, CA 93107-1828
PO BOX 11829, SANTA BARBARA, CA 93107-1829
PO BOX 11830, SANTA BARBARA, CA 93107-1830
PO BOX 11831, SANTA BARBARA, CA 93107-1831
PO BOX 11832, SANTA BARBARA, CA 93107-1832
PO BOX 11833, SANTA BARBARA, CA 93107-1833
PO BOX 11834, SANTA BARBARA, CA 93107-1834
PO BOX 11835, SANTA BARBARA, CA 93107-1835
PO BOX 11836, SANTA BARBARA, CA 93107-1836
PO BOX 11837, SANTA BARBARA, CA 93107-1837
PO BOX 11838, SANTA BARBARA, CA 93107-1838
PO BOX 11839, SANTA BARBARA, CA 93107-1839
PO BOX 11840, SANTA BARBARA, CA 93107-1840
PO BOX 11841, SANTA BARBARA, CA 93107-1841
PO BOX 11842, SANTA BARBARA, CA 93107-1842
PO BOX 11843, SANTA BARBARA, CA 93107-1843
PO BOX 11844, SANTA BARBARA, CA 93107-1844
PO BOX 11845, SANTA BARBARA, CA 93107-1845
PO BOX 11846, SANTA BARBARA, CA 93107-1846
PO BOX 11847, SANTA BARBARA, CA 93107-1847
PO BOX 11848, SANTA BARBARA, CA 93107-1848
PO BOX 11849, SANTA BARBARA, CA 93107-1849
PO BOX 11850, SANTA BARBARA, CA 93107-1850
PO BOX 11851, SANTA BARBARA, CA 93107-1851
PO BOX 11852, SANTA BARBARA, CA 93107-1852
PO BOX 11853, SANTA BARBARA, CA 93107-1853
PO BOX 11854, SANTA BARBARA, CA 93107-1854
PO BOX 11855, SANTA BARBARA, CA 93107-1855
PO BOX 11856, SANTA BARBARA, CA 93107-1856
PO BOX 11857, SANTA BARBARA, CA 93107-1857
PO BOX 11858, SANTA BARBARA, CA 93107-1858
PO BOX 11859, SANTA BARBARA, CA 93107-1859
PO BOX 11860, SANTA BARBARA, CA 93107-1860
PO BOX 11861, SANTA BARBARA, CA 93107-1861
PO BOX 11862, SANTA BARBARA, CA 93107-1862
PO BOX 11863, SANTA BARBARA, CA 93107-1863
PO BOX 11864, SANTA BARBARA, CA 93107-1864
PO BOX 11865, SANTA BARBARA, CA 93107-1865
PO BOX 11866, SANTA BARBARA, CA 93107-1866
PO BOX 11867, SANTA BARBARA, CA 93107-1867
PO BOX 11868, SANTA BARBARA, CA 93107-1868
PO BOX 11869, SANTA BARBARA, CA 93107-1869
PO BOX 11870, SANTA BARBARA, CA 93107-1870
PO BOX 11871, SANTA BARBARA, CA 93107-1871
PO BOX 11872, SANTA BARBARA, CA 93107-1872
PO BOX 11873, SANTA BARBARA, CA 93107-1873
PO BOX 11874, SANTA BARBARA, CA 93107-1874
PO BOX 11875, SANTA BARBARA, CA 93107-1875
PO BOX 11876, SANTA BARBARA, CA 93107-1876
PO BOX 11877, SANTA BARBARA, CA 93107-1877
PO BOX 11878, SANTA BARBARA, CA 93107-1878
PO BOX 11879, SANTA BARBARA, CA 93107-1879
PO BOX 11880, SANTA BARBARA, CA 93107-1880
PO BOX 11881, SANTA BARBARA, CA 93107-1881
PO BOX 11882, SANTA BARBARA, CA 93107-1882
PO BOX 11883, SANTA BARBARA, CA 93107-1883
PO BOX 11884, SANTA BARBARA, CA 93107-1884
PO BOX 11885, SANTA BARBARA, CA 93107-1885
PO BOX 11886, SANTA BARBARA, CA 93107-1886
PO BOX 11887, SANTA BARBARA, CA 93107-1887
PO BOX 11888, SANTA BARBARA, CA 93107-1888
PO BOX 11889, SANTA BARBARA, CA 93107-1889
PO BOX 11890, SANTA BARBARA, CA 93107-1890
PO BOX 11891, SANTA BARBARA, CA 93107-1891
PO BOX 11892, SANTA BARBARA, CA 93107-1892
PO BOX 11893, SANTA BARBARA, CA 93107-1893
PO BOX 11894, SANTA BARBARA, CA 93107-1894
PO BOX 11895, SANTA BARBARA, CA 93107-1895
PO BOX 11896, SANTA BARBARA, CA 93107-1896
PO BOX 11897, SANTA BARBARA, CA 93107-1897
PO BOX 11898, SANTA BARBARA, CA 93107-1898
PO BOX 11899, SANTA BARBARA, CA 93107-1899
PO BOX 11900, SANTA BARBARA, CA 93107-1900
PO BOX 11901, SANTA BARBARA, CA 93107-1901
PO BOX 11902, SANTA BARBARA, CA 93107-1902
PO BOX 11903, SANTA BARBARA, CA 93107-1903
PO BOX 11904, SANTA BARBARA, CA 93107-1904
PO BOX 11905, SANTA BARBARA, CA 93107-1905
PO BOX 11906, SANTA BARBARA, CA 93107-1906
PO BOX 11907, SANTA BARBARA, CA 93107-1907
PO BOX 11908, SANTA BARBARA, CA 93107-1908
PO BOX 11909, SANTA BARBARA, CA 93107-1909
PO BOX 11910, SANTA BARBARA, CA 93107-1910
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