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 1801, IMPERIAL BEACH, CA 91933-1801
PO BOX 1802, IMPERIAL BEACH, CA 91933-1802
PO BOX 1803, IMPERIAL BEACH, CA 91933-1803
PO BOX 1804, IMPERIAL BEACH, CA 91933-1804
PO BOX 1805, IMPERIAL BEACH, CA 91933-1805
PO BOX 1806, IMPERIAL BEACH, CA 91933-1806
PO BOX 1807, IMPERIAL BEACH, CA 91933-1807
PO BOX 1808, IMPERIAL BEACH, CA 91933-1808
PO BOX 1809, IMPERIAL BEACH, CA 91933-1809
PO BOX 1810, IMPERIAL BEACH, CA 91933-1810
PO BOX 1811, IMPERIAL BEACH, CA 91933-1811
PO BOX 1812, IMPERIAL BEACH, CA 91933-1812
PO BOX 1813, IMPERIAL BEACH, CA 91933-1813
PO BOX 1814, IMPERIAL BEACH, CA 91933-1814
PO BOX 1815, IMPERIAL BEACH, CA 91933-1815
PO BOX 1816, IMPERIAL BEACH, CA 91933-1816
PO BOX 1817, IMPERIAL BEACH, CA 91933-1817
PO BOX 1818, IMPERIAL BEACH, CA 91933-1818
PO BOX 1819, IMPERIAL BEACH, CA 91933-1819
PO BOX 1820, IMPERIAL BEACH, CA 91933-1820
PO BOX 1821, IMPERIAL BEACH, CA 91933-1821
PO BOX 1822, IMPERIAL BEACH, CA 91933-1822
PO BOX 1823, IMPERIAL BEACH, CA 91933-1823
PO BOX 1824, IMPERIAL BEACH, CA 91933-1824
PO BOX 1825, IMPERIAL BEACH, CA 91933-1825
PO BOX 1826, IMPERIAL BEACH, CA 91933-1826
PO BOX 1827, IMPERIAL BEACH, CA 91933-1827
PO BOX 1828, IMPERIAL BEACH, CA 91933-1828
PO BOX 1829, IMPERIAL BEACH, CA 91933-1829
PO BOX 1830, IMPERIAL BEACH, CA 91933-1830
PO BOX 1831, IMPERIAL BEACH, CA 91933-1831
PO BOX 1832, IMPERIAL BEACH, CA 91933-1832
PO BOX 1833, IMPERIAL BEACH, CA 91933-1833
PO BOX 1834, IMPERIAL BEACH, CA 91933-1834
PO BOX 1835, IMPERIAL BEACH, CA 91933-1835
PO BOX 1836, IMPERIAL BEACH, CA 91933-1836
PO BOX 1837, IMPERIAL BEACH, CA 91933-1837
PO BOX 1838, IMPERIAL BEACH, CA 91933-1838
PO BOX 1839, IMPERIAL BEACH, CA 91933-1839
PO BOX 1840, IMPERIAL BEACH, CA 91933-1840
PO BOX 1841, IMPERIAL BEACH, CA 91933-1841
PO BOX 1842, IMPERIAL BEACH, CA 91933-1842
PO BOX 1843, IMPERIAL BEACH, CA 91933-1843
PO BOX 1844, IMPERIAL BEACH, CA 91933-1844
PO BOX 1845, IMPERIAL BEACH, CA 91933-1845
PO BOX 1846, IMPERIAL BEACH, CA 91933-1846
PO BOX 1847, IMPERIAL BEACH, CA 91933-1847
PO BOX 1848, IMPERIAL BEACH, CA 91933-1848
PO BOX 1849, IMPERIAL BEACH, CA 91933-1849
PO BOX 1850, IMPERIAL BEACH, CA 91933-1850
PO BOX 1851, IMPERIAL BEACH, CA 91933-1851
PO BOX 1852, IMPERIAL BEACH, CA 91933-1852
PO BOX 1853, IMPERIAL BEACH, CA 91933-1853
PO BOX 1854, IMPERIAL BEACH, CA 91933-1854
PO BOX 1855, IMPERIAL BEACH, CA 91933-1855
PO BOX 1856, IMPERIAL BEACH, CA 91933-1856
PO BOX 1857, IMPERIAL BEACH, CA 91933-1857
PO BOX 1858, IMPERIAL BEACH, CA 91933-1858
PO BOX 1859, IMPERIAL BEACH, CA 91933-1859
PO BOX 1860, IMPERIAL BEACH, CA 91933-1860
PO BOX 1861, IMPERIAL BEACH, CA 91933-1861
PO BOX 1862, IMPERIAL BEACH, CA 91933-1862
PO BOX 1863, IMPERIAL BEACH, CA 91933-1863
PO BOX 1864, IMPERIAL BEACH, CA 91933-1864
PO BOX 1865, IMPERIAL BEACH, CA 91933-1865
PO BOX 1866, IMPERIAL BEACH, CA 91933-1866
PO BOX 1867, IMPERIAL BEACH, CA 91933-1867
PO BOX 1868, IMPERIAL BEACH, CA 91933-1868
PO BOX 1869, IMPERIAL BEACH, CA 91933-1869
PO BOX 1870, IMPERIAL BEACH, CA 91933-1870
PO BOX 1871, IMPERIAL BEACH, CA 91933-1871
PO BOX 1872, IMPERIAL BEACH, CA 91933-1872
PO BOX 1873, IMPERIAL BEACH, CA 91933-1873
PO BOX 1874, IMPERIAL BEACH, CA 91933-1874
PO BOX 1875, IMPERIAL BEACH, CA 91933-1875
PO BOX 1876, IMPERIAL BEACH, CA 91933-1876
PO BOX 1877, IMPERIAL BEACH, CA 91933-1877
PO BOX 1878, IMPERIAL BEACH, CA 91933-1878
PO BOX 1879, IMPERIAL BEACH, CA 91933-1879
PO BOX 1880, IMPERIAL BEACH, CA 91933-1880
PO BOX 1881, IMPERIAL BEACH, CA 91933-1881
PO BOX 1882, IMPERIAL BEACH, CA 91933-1882
PO BOX 1883, IMPERIAL BEACH, CA 91933-1883
PO BOX 1884, IMPERIAL BEACH, CA 91933-1884
PO BOX 1885, IMPERIAL BEACH, CA 91933-1885
PO BOX 1886, IMPERIAL BEACH, CA 91933-1886
PO BOX 1887, IMPERIAL BEACH, CA 91933-1887
PO BOX 1888, IMPERIAL BEACH, CA 91933-1888
PO BOX 1889, IMPERIAL BEACH, CA 91933-1889
PO BOX 1890, IMPERIAL BEACH, CA 91933-1890
PO BOX 1891, IMPERIAL BEACH, CA 91933-1891
PO BOX 1892, IMPERIAL BEACH, CA 91933-1892
PO BOX 1893, IMPERIAL BEACH, CA 91933-1893
PO BOX 1894, IMPERIAL BEACH, CA 91933-1894
PO BOX 1895, IMPERIAL BEACH, CA 91933-1895
PO BOX 1896, IMPERIAL BEACH, CA 91933-1896
PO BOX 1897, IMPERIAL BEACH, CA 91933-1897
PO BOX 1898, IMPERIAL BEACH, CA 91933-1898
PO BOX 1899, IMPERIAL BEACH, CA 91933-1899
PO BOX 1900, IMPERIAL BEACH, CA 91933-1900
PO BOX 1901, IMPERIAL BEACH, CA 91933-1901
PO BOX 1902, IMPERIAL BEACH, CA 91933-1902
PO BOX 1903, IMPERIAL BEACH, CA 91933-1903
PO BOX 1904, IMPERIAL BEACH, CA 91933-1904
PO BOX 1905, IMPERIAL BEACH, CA 91933-1905
PO BOX 1906, IMPERIAL BEACH, CA 91933-1906
PO BOX 1907, IMPERIAL BEACH, CA 91933-1907
PO BOX 1908, IMPERIAL BEACH, CA 91933-1908
PO BOX 1909, IMPERIAL BEACH, CA 91933-1909
PO BOX 1910, IMPERIAL BEACH, CA 91933-1910
PO BOX 1911, IMPERIAL BEACH, CA 91933-1911
PO BOX 1912, IMPERIAL BEACH, CA 91933-1912
PO BOX 1913, IMPERIAL BEACH, CA 91933-1913
PO BOX 1914, IMPERIAL BEACH, CA 91933-1914
PO BOX 1915, IMPERIAL BEACH, CA 91933-1915
PO BOX 1916, IMPERIAL BEACH, CA 91933-1916
PO BOX 1917, IMPERIAL BEACH, CA 91933-1917
PO BOX 1918, IMPERIAL BEACH, CA 91933-1918
PO BOX 1919, IMPERIAL BEACH, CA 91933-1919
PO BOX 1920, IMPERIAL BEACH, CA 91933-1920
PO BOX 1921, IMPERIAL BEACH, CA 91933-1921
PO BOX 1922, IMPERIAL BEACH, CA 91933-1922
PO BOX 1923, IMPERIAL BEACH, CA 91933-1923
PO BOX 1924, IMPERIAL BEACH, CA 91933-1924
PO BOX 1925, IMPERIAL BEACH, CA 91933-1925
PO BOX 1926, IMPERIAL BEACH, CA 91933-1926
PO BOX 1927, IMPERIAL BEACH, CA 91933-1927
PO BOX 1928, IMPERIAL BEACH, CA 91933-1928
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