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 1821, SHALLOTTE, NC 28459-1821
PO BOX 1822, SHALLOTTE, NC 28459-1822
PO BOX 1823, SHALLOTTE, NC 28459-1823
PO BOX 1824, SHALLOTTE, NC 28459-1824
PO BOX 1825, SHALLOTTE, NC 28459-1825
PO BOX 1826, SHALLOTTE, NC 28459-1826
PO BOX 1827, SHALLOTTE, NC 28459-1827
PO BOX 1828, SHALLOTTE, NC 28459-1828
PO BOX 1829, SHALLOTTE, NC 28459-1829
PO BOX 1830, SHALLOTTE, NC 28459-1830
PO BOX 1831, SHALLOTTE, NC 28459-1831
PO BOX 1832, SHALLOTTE, NC 28459-1832
PO BOX 1833, SHALLOTTE, NC 28459-1833
PO BOX 1834, SHALLOTTE, NC 28459-1834
PO BOX 1835, SHALLOTTE, NC 28459-1835
PO BOX 1836, SHALLOTTE, NC 28459-1836
PO BOX 1837, SHALLOTTE, NC 28459-1837
PO BOX 1838, SHALLOTTE, NC 28459-1838
PO BOX 1839, SHALLOTTE, NC 28459-1839
PO BOX 1840, SHALLOTTE, NC 28459-1840
PO BOX 1841, SHALLOTTE, NC 28459-1841
PO BOX 1842, SHALLOTTE, NC 28459-1842
PO BOX 1843, SHALLOTTE, NC 28459-1843
PO BOX 1844, SHALLOTTE, NC 28459-1844
PO BOX 1845, SHALLOTTE, NC 28459-1845
PO BOX 1846, SHALLOTTE, NC 28459-1846
PO BOX 1847, SHALLOTTE, NC 28459-1847
PO BOX 1848, SHALLOTTE, NC 28459-1848
PO BOX 1849, SHALLOTTE, NC 28459-1849
PO BOX 1850, SHALLOTTE, NC 28459-1850
PO BOX 1851, SHALLOTTE, NC 28459-1851
PO BOX 1852, SHALLOTTE, NC 28459-1852
PO BOX 1853, SHALLOTTE, NC 28459-1853
PO BOX 1854, SHALLOTTE, NC 28459-1854
PO BOX 1855, SHALLOTTE, NC 28459-1855
PO BOX 1856, SHALLOTTE, NC 28459-1856
PO BOX 1857, SHALLOTTE, NC 28459-1857
PO BOX 1858, SHALLOTTE, NC 28459-1858
PO BOX 1859, SHALLOTTE, NC 28459-1859
PO BOX 1860, SHALLOTTE, NC 28459-1860
PO BOX 1861, SHALLOTTE, NC 28459-1861
PO BOX 1862, SHALLOTTE, NC 28459-1862
PO BOX 1863, SHALLOTTE, NC 28459-1863
PO BOX 1864, SHALLOTTE, NC 28459-1864
PO BOX 1865, SHALLOTTE, NC 28459-1865
PO BOX 1866, SHALLOTTE, NC 28459-1866
PO BOX 1867, SHALLOTTE, NC 28459-1867
PO BOX 1868, SHALLOTTE, NC 28459-1868
PO BOX 1869, SHALLOTTE, NC 28459-1869
PO BOX 1870, SHALLOTTE, NC 28459-1870
PO BOX 1871, SHALLOTTE, NC 28459-1871
PO BOX 1872, SHALLOTTE, NC 28459-1872
PO BOX 1873, SHALLOTTE, NC 28459-1873
PO BOX 1874, SHALLOTTE, NC 28459-1874
PO BOX 1875, SHALLOTTE, NC 28459-1875
PO BOX 1876, SHALLOTTE, NC 28459-1876
PO BOX 1877, SHALLOTTE, NC 28459-1877
PO BOX 1878, SHALLOTTE, NC 28459-1878
PO BOX 1879, SHALLOTTE, NC 28459-1879
PO BOX 1880, SHALLOTTE, NC 28459-1880
PO BOX 1881, SHALLOTTE, NC 28459-1881
PO BOX 1882, SHALLOTTE, NC 28459-1882
PO BOX 1883, SHALLOTTE, NC 28459-1883
PO BOX 1884, SHALLOTTE, NC 28459-1884
PO BOX 1885, SHALLOTTE, NC 28459-1885
PO BOX 1886, SHALLOTTE, NC 28459-1886
PO BOX 1887, SHALLOTTE, NC 28459-1887
PO BOX 1888, SHALLOTTE, NC 28459-1888
PO BOX 1889, SHALLOTTE, NC 28459-1889
PO BOX 1890, SHALLOTTE, NC 28459-1890
PO BOX 1891, SHALLOTTE, NC 28459-1891
PO BOX 1892, SHALLOTTE, NC 28459-1892
PO BOX 1893, SHALLOTTE, NC 28459-1893
PO BOX 1894, SHALLOTTE, NC 28459-1894
PO BOX 1895, SHALLOTTE, NC 28459-1895
PO BOX 1896, SHALLOTTE, NC 28459-1896
PO BOX 1897, SHALLOTTE, NC 28459-1897
PO BOX 1898, SHALLOTTE, NC 28459-1898
PO BOX 1899, SHALLOTTE, NC 28459-1899
PO BOX 1900, SHALLOTTE, NC 28459-1900
PO BOX 1901, SHALLOTTE, NC 28459-1901
PO BOX 1902, SHALLOTTE, NC 28459-1902
PO BOX 1903, SHALLOTTE, NC 28459-1903
PO BOX 1904, SHALLOTTE, NC 28459-1904
PO BOX 1905, SHALLOTTE, NC 28459-1905
PO BOX 1906, SHALLOTTE, NC 28459-1906
PO BOX 1907, SHALLOTTE, NC 28459-1907
PO BOX 1908, SHALLOTTE, NC 28459-1908
PO BOX 1909, SHALLOTTE, NC 28459-1909
PO BOX 1910, SHALLOTTE, NC 28459-1910
PO BOX 1911, SHALLOTTE, NC 28459-1911
PO BOX 1912, SHALLOTTE, NC 28459-1912
PO BOX 1913, SHALLOTTE, NC 28459-1913
PO BOX 1914, SHALLOTTE, NC 28459-1914
PO BOX 1915, SHALLOTTE, NC 28459-1915
PO BOX 1916, SHALLOTTE, NC 28459-1916
PO BOX 1917, SHALLOTTE, NC 28459-1917
PO BOX 1918, SHALLOTTE, NC 28459-1918
PO BOX 1919, SHALLOTTE, NC 28459-1919
PO BOX 1920, SHALLOTTE, NC 28459-1920
PO BOX 1921, SHALLOTTE, NC 28459-1921
PO BOX 1922, SHALLOTTE, NC 28459-1922
PO BOX 1923, SHALLOTTE, NC 28459-1923
PO BOX 1924, SHALLOTTE, NC 28459-1924
PO BOX 1925, SHALLOTTE, NC 28459-1925
PO BOX 1926, SHALLOTTE, NC 28459-1926
PO BOX 1927, SHALLOTTE, NC 28459-1927
PO BOX 1928, SHALLOTTE, NC 28459-1928
PO BOX 1929, SHALLOTTE, NC 28459-1929
PO BOX 1930, SHALLOTTE, NC 28459-1930
PO BOX 1931, SHALLOTTE, NC 28459-1931
PO BOX 1932, SHALLOTTE, NC 28459-1932
PO BOX 1933, SHALLOTTE, NC 28459-1933
PO BOX 1934, SHALLOTTE, NC 28459-1934
PO BOX 1935, SHALLOTTE, NC 28459-1935
PO BOX 1936, SHALLOTTE, NC 28459-1936
PO BOX 1937, SHALLOTTE, NC 28459-1937
PO BOX 1938, SHALLOTTE, NC 28459-1938
PO BOX 1939, SHALLOTTE, NC 28459-1939
PO BOX 1940, SHALLOTTE, NC 28459-1940
PO BOX 1941, SHALLOTTE, NC 28459-1941
PO BOX 1942, SHALLOTTE, NC 28459-1942
PO BOX 1943, SHALLOTTE, NC 28459-1943
PO BOX 1944, SHALLOTTE, NC 28459-1944
PO BOX 1945, SHALLOTTE, NC 28459-1945
PO BOX 1946, SHALLOTTE, NC 28459-1946
PO BOX 1947, SHALLOTTE, NC 28459-1947
PO BOX 1948, SHALLOTTE, NC 28459-1948
PO BOX 1949, SHALLOTTE, NC 28459-1949
PO BOX 1950, SHALLOTTE, NC 28459-1950
PO BOX 1951, SHALLOTTE, NC 28459-1951
PO BOX 1952, SHALLOTTE, NC 28459-1952
PO BOX 1953, SHALLOTTE, NC 28459-1953
PO BOX 1954, SHALLOTTE, NC 28459-1954
PO BOX 1955, SHALLOTTE, NC 28459-1955
PO BOX 1956, SHALLOTTE, NC 28459-1956
PO BOX 1957, SHALLOTTE, NC 28459-1957
PO BOX 1958, SHALLOTTE, NC 28459-1958
PO BOX 1959, SHALLOTTE, NC 28459-1959
PO BOX 1960, SHALLOTTE, NC 28459-1960
PO BOX 1961, SHALLOTTE, NC 28459-1961
PO BOX 1962, SHALLOTTE, NC 28459-1962
PO BOX 1963, SHALLOTTE, NC 28459-1963
PO BOX 1964, SHALLOTTE, NC 28459-1964
PO BOX 1965, SHALLOTTE, NC 28459-1965
PO BOX 1966, SHALLOTTE, NC 28459-1966
PO BOX 1967, SHALLOTTE, NC 28459-1967
PO BOX 1968, SHALLOTTE, NC 28459-1968
PO BOX 1969, SHALLOTTE, NC 28459-1969
PO BOX 1970, SHALLOTTE, NC 28459-1970
PO BOX 1971, SHALLOTTE, NC 28459-1971
PO BOX 1972, SHALLOTTE, NC 28459-1972
PO BOX 1973, SHALLOTTE, NC 28459-1973
PO BOX 1974, SHALLOTTE, NC 28459-1974
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